1 10 20 https://theses.otagogeology.org.nz/files/original/57e00179957dc3c5a10d33062a463699.pdf 317e0a92009b8e549b0cc0d8040c2d00 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format MULTIPOLYGON (((169.007357194797 -44.4801048617569,168.852891876841 -44.7153959537916,168.644939480572 -44.8819889426719,168.53059861996 -44.8789917767537,168.652743501904 -44.4707082049925,169.007357194797 -44.4801048617569))) Author last name Last name of the Author Wellnitz Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Scott, J.M. Palin, J.M. Abstract The Abstract for this thesis In this thesis the chemistry and textures of void-filling hydrothermal carbonate and associated altered metamorphic and lamprophyric rock in western Otago, New Zealand, were studied. With this information a detailed model of the mobility behaviour of various elements is established. Conduits for CO2-bearing fluids were faults, joints, folds and, in the northernmost part of the study area, volcanic diatremes. The southernmost study area lies in the Shotover Valley, where many of the larger fault zones are auriferous. Throughout the studied area, many larger faults, including the gold-bearing ones, strike W to NW. In addition to these faults, there are also structures (i.e. veins and fold hinges) that trend northwards. The formation of most of the structures happened in the Oligocene -Miocene andwas closely connected to the movements along the newly forming Alpine Fault and reverse movements along the Moonlight Fault. Adjacent to the fluid conduits, the wall rock has been extensively altered. This alteration is especially obvious in greenschist and the altered rock has a pale creamy colour due to the replacement of various metamorphic phases (epidote, chlorite, actinolite) mostly by Fe-bearing carbonate and phyllosilicates. In quartzo-feldspathic greyschists the same metamorphic minerals as in greenschist are unstable in response to the incoming CO2-bearing fluid. However, as those minerals are less abundant in greyschist, the alteration is less obvious. Textural and chemical data of the individual metamorphic and hydrothermal minerals forming during replacement were obtained using SEM, microprobe and LA-ICP-MS. The hydrothermal minerals replacing metamorphic minerals describea diverse array of mineral textures, which give insight into relative solubility of the different mineral phases. The replacement reactions also attest to mobility and immobility of the different major and trace elements. For example, in the breakdown of epidote in rocks which contain metamorphic muscovite, Al is mobilised potentially in F-OH complexes and transported away from the original epidote site, whereafter carbonate forms. In cases where there is no muscovite in the rock, epidote is replaced by muscovite, hence resulting in local loss of Ca. At the same time, the REE of this epidote are also mobilised on microscopic scale (µm to mm) as the growing muscovite cannot accommodate the REE in its crystal structure. These REE are then incorporated in the ankerite replacing the chlorite. On a macroscopic scale (cm to m), Sr, Ba, Rb, K and Cs show the largest mobility during the hydrothermal alteration (sometimes up to 20 times enrichment in the altered rock compared to the unaltered rock) and are often brought into the rock by the hydrothermal fluid. The REE and Al, on the other hand, do not show any signs of mobility at thatscale. Overall, of all elements in alteration-sensitive metamorphic minerals, only titanium is shown to be immobile throughout, also on µm scale. In addition to carbonate forming in the hydrothermal alteration halo around fluid conduits, carbonate is also a common void-filling mineral, such as fractures and vesicles. The chemical composition of these carbonates shows that the different elements are controlled by various factors. Contents of Ca, Sr, Mg, Fe, Mn and according ratios show that these elements can travel metres to tens of metres in the fluid before they are precipitated in carbonate. REE contents and patterns in the carbonate are the product of the interplay between fluid- and rock-dominated processes; in cases were only little rock needs to be leached to form the carbonate, the REE patterns are very similar to the wall rock. In cases where relatively large rock volumes need to be leached to provide the main components of the void-filling carbonate, the REE content of the carbonate is dominated by fluid-controlled processes and the REE patterns reflect the relative solubility of the different REE in the fluid. Radiogenic isotopic compositions (Nd, Sr) of void filling carbonates and wall rock show that Nd and Sr in the carbonates travel different distances in the fluid conduit; Nd isotopic ratios show that the bulk of the LREE are transported for short distances in the fluid passing through the void (cm to dm), whereas Sr isotopic ratios confirm that Sr can be for transported many meters by the aqueous fluid. Stable isotope data (C, O) in conjunction with assessing the regional geological and tectonic settings permitted to reconstruct the history and sources of the fluids in the studied areas; after taking temperature effects on isotope fractionation and relative sample locations into account, it is concluded that two main fluid types were present in the studied area. One of these is a mixture of meteoric and magmatic components, while the other fluid interacted extensively with the metamorphic rock in Western Otago, but was most likely originally meteoric-derived water. Only in the volcanic diatremes is there indication that these two fluid types mix. Outside the diatreme, the isotopic composition of the carbonate give evidence that only the second mentioned fluid type was present, including in the auriferous structures and there is no indication that the gold-bearing and magmatic system had any connection to each other OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/7300">http://hdl.handle.net/10523/7300</a> OURArchvive access level Open Access Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Southern Alps Thesis description Number of pages, maps, CDs, etc. 257 pages A4 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2017Wellnitz Creator An entity primarily responsible for making the resource Wellnitz, Anne Katrin (Katrin) Date A point or period of time associated with an event in the lifecycle of the resource 2017 Title A name given to the resource Carbonate alteration associated with lamprophyres and orogenic gold, Southern Alps, New Zealand Subject The topic of the resource Igneous geology Metamorphic geology Alteration Carbonate Fluid gold Lamprophyres New Zealand radiogenic isotopes Rare Earth Elements stable isotopes https://theses.otagogeology.org.nz/files/original/1dc9fa6fea23b8854e51de7822a4883a.pdf 8c771bf043a96260d23b307a0fb56587 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format MULTIPOLYGON (((167.850350833773 -46.3762799337737,167.867105449267 -46.367889677738,167.889411266548 -46.3736546885395,167.890644223913 -46.3899051356639,167.882892749382 -46.3962262417941,167.856209525306 -46.3900721193642,167.850350833773 -46.3762799337737))) Author last name Last name of the Author Galloway Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Palin, J.M. Abstract The Abstract for this thesis Oraka Point is located along the Southland coast of New Zealand at an inferred intersection between the Median Batholith and Brook Street Terrane. Plutonic rock found at Oraka Point represents the western edge of the Eastern Province and is therefore pivotal in the understanding of processes and timing for accretion of the Brook Street Terrane to the Gondwana margin (Median Batholith). Geochemical analysis of major and trace elements of samples from Oraka Point yielded granite, quartz diorite, diorite and gabbro compositions. Samples of granitic and dioritic composition exhibit geochemical signatures consistent with a calc-alkaline magma series derived from the subcontinental lithosphere. Samples of gabbroic composition exhibit a minor affinity towards a tholeiitic magma series; again derived from the subcontinental lithosphere but with an asthenosphere influence. This, along with mobile element enrichment patterns, points to a setting in which Oraka Point was likely a part of a volcanic arc complex that was transitioning from an island arc setting to an active continental margin setting. Major and trace element data shows fractionation as the dominant factor in magma evolution at Oraka Point. Magnetite and plagioclase trace element compositions along with enclaves and clots found in situ, indicate magma mixing and mingling were also key processes. However, their role to date remains undefined in the formation of rock at Oraka Point. Fractionation trends show a geochemical affinity between the Hekeia Gabbro of Oraka Point and the Hekeia Gabbro of the Longwood Range. This affinity was made prior to this research through petrographic similarities and minor geochemical work. This affinity confirms Oraka Point as being a member of the Longwood Suite. LA-ICP-MS U-Pb zircon data of five samples obtained from Oraka Diorite and Colac Granite yielded ages between 241-250 Ma confirming a mid-early Triassic setting. The age range supports previous works that aligned Oraka Point as part of a progressively decreasing age trend from east to west within basement terranes along the Southland coast. Nd isotopic ratios indicate Oraka Point being strongly affiliated to the Longwood Suite with data fields having a clear overlap. Sr isotopic ratios were less conclusive to an affinity with the Longwood Suite and exhibited a wider spread of ratios, possible indicating an as yet undescribed thermal event. The new data presented here has led to Oraka Point as being interpreted as deriving from magmas that share the volcanic arc signature of the primitive Brook Street Terrane. The data also shows evidence for a transition towards the evolved Gondwanan continental margin signature. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/7149">http://hdl.handle.net/10523/7149</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Oraka Point Southland Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2017Galloway Creator An entity primarily responsible for making the resource Galloway, James Robert (James) Date A point or period of time associated with an event in the lifecycle of the resource 2017 Title A name given to the resource Igneous Petrogenesis of Plutonic Rock at Oraka Point, Southland Subject The topic of the resource Igneous geology "LA-ICP-MS Brook Street Terrane Igneous isotopic ratios Longwood Suite New Zealand Oraka Point plutonic Southland zircon dating https://theses.otagogeology.org.nz/files/original/ca4daf29d66467b51c0e40a3e113fa15.pdf 60fac19bf87344ea964bf943ce481d7b Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((172.653411695100857 -40.733981405903172,172.848936092355757 -40.734879609329646,172.849680830049124 -40.960359368512023,172.649727311084945 -40.958018535176606,172.653411695100857 -40.733981405903172)) Author last name Last name of the Author Moerhuis Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Scott, J.M. Palin, J.M. Abstract The Abstract for this thesis The Onekaka Schist, a constituent of the eastboard Takaka Terrane in northwest Nelson, is a north-trending fault slice of stratigraphically intact Ordovician-Silurian quartzofeldspathic, amphibolite and quartzite metasediments. The pressure, temperature, timing and deformation (P-T-t-D) history and depositional setting of the Onekaka Schist is examined through petrology, geothermobarometry, whole rock chemistry and zircon geochronology. Quartzofeldspathic metasediments (metaconglomerates, sandstones, mudstones, and amphibolites) were deposited into an active continental margin (convergent/collisional) environment, whereas quartzites were deposited into a passive margin environment. The Onekaka Schist contains a typical peak equilibrium biotite-andesine-garnet-quartz-calcite (± hornblende-staurolite-kyanite) mineral assemblage. Four structural and mineralogical fabrics occur in aluminous schists; S0) sedimentary contacts and composition variation, S1) primary foliation observed as relict quartz inclusion trails in garnet, S2) development of a pervasive lepidoblastic biotite foliation, S3) crenulation of the earlier foliation accompanied by garnet growth, and S4) a chlorite, epidote and muscovite lineation. S3 represents peak metamorphic conditions. All fabrics are rotated by north trending kilometre-scale folding. Two generations of mineralized veins cross-cut the foliation; K-feldspar veins containing Cu-sulfides and chlorite-carbonate veins containing Fe-sulfides. In both cases, mineralization occurred by retrogressive alteration of the peak mineral assemblage. Kyanite-quartz veins contain a peak kyanite-staurolite-garnet-andesine-biotite-quartz assemblage in alterations zones reflecting S3 conditions, which has been pervasively altered into a muscovite-margarite-chlorite-ilmenite assemblage. Peak equilibrium pressure-temperature conditions were calculated by major and minor element geothermobarometry on garnet-biotite-plagioclase-quartz assemblages. Conditions increase southeast across the Onekaka Schist, from 576 ± 12 °C at the northern end of the fault slice to 610 ± 12 °C and 7.5 ± 0.5 kbar conditions at the southern end (Anatoki River). Ti-in-quartz geothermometry of quartz in hydrothermal veins indicates that quartz crystallized between 460 – 550 ± 20 °C. Ti-in-quartz geothermometry of quartzites develop a S1 – S2 foliation at c. 400 ± 20 °C. Detrital zircon age populations indicate Ross-Delamerian, Pan-African and Grenville Orogeny provenance. Variation in age population abundance between quartzofeldspathic and micaceous schists to quartzites may indicate a changing sediment source. A c. 390 – 400 Ma zircon population is likely to reflect S3 metamorphism of the Onekaka Schist. The Onekaka Schist represents a slither of Paleozoic metasediments deposited in a predominantly convergent-collisional continental setting. Amphibolite facies metamorphism across the Onekaka Schist correlates to the Pikikiruna Schist, and indicates that barrovian metamorphism was occurring on a regional scale during terrane amalgamation of the Buller and Takaka terranes prior to regional deformation during the Rangitata Orogeny. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/5540">http://hdl.handle.net/10523/5540</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Onekaka Golden Bay Northwest Nelson Thesis description Number of pages, maps, CDs, etc. xiv, 319 pages A4, Map in back pocket Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2015Moerhuis Creator An entity primarily responsible for making the resource Moerhuis, Nichole Date A point or period of time associated with an event in the lifecycle of the resource 2015 Title A name given to the resource Deposition, Metamorphism and Mineralization of the Onekaka Schist in northwest Nelson Subject The topic of the resource Metamorphic geology Garnet-Biotite-Plagioclase-Quartz Geothermobarometry Nelson New Zealand Onekaka Schist Takaka Terrane Ti-in-Quartz zircon https://theses.otagogeology.org.nz/files/original/c8122ac95331b2bedcd88163976c7415.pdf dc8934c1ab73d099baa47beb8bc8cdfa Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((172.29277217379618 -42.059412438243626,172.290627751644621 -42.022224672831719,172.45682957846401 -42.020271904891452,172.459986571827102 -42.250956519757139,172.291865490327581 -42.255760681111717,172.29277217379618 -42.059412438243626)) Author last name Last name of the Author Sagar Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Palin, J.M. Toy, V.G. Abstract The Abstract for this thesis Distinctive basement gneisses of the Glenroy Complex and granitoids of the Mt. Cann Pluton and McKnee Intrusives are exposed in the Alpine Fault footwall, southeast Nelson, New Zealand. These rocks comprise tectonic blocks that form a foreland thrust system that has developed adjacent to a major restraining bend (“Big Bend”) in the Alpine Fault. The age of the Big Bend and its influence on exhumation of the Australian Plate are poorly constrained. This thesis addresses this issue through integration of conventional thermobarometry, U-Pb geochronology, and 40Ar/39Ar and fission-track thermochronology. The Glenroy Complex was intruded between 127.9–121.6 Ma and metamorphism occurred at 120.6 ± 0.9 Ma. Emplacement of the McKnee Intrusives occurred in two discrete episodes at 224.8 ± 2.6 Ma and 137.8 ± 0.7 Ma. These ages, in combination with whole-rock geochemistry, suggest that the McKnee Intrusives, Glenroy Complex and Mt. Cann Pluton are correlatives of the calc-alkaline Darran Suite, HiSY Western Fiordland Orthogneiss (WFO), and HiSY Separation Point Granite, respectively. Thus, the McKnee Intrusives and Woodham Orthogneiss have been displaced ~500 km along the Alpine Fault, while the Mt. Cann Pluton is autochthonous basement over which the former units have been tectonically emplaced. Using the Woodham Orthogneiss and WFO as piercing points, a slip-rate of 22–25 mm/year is calculated for the Alpine Fault, which overlaps existing long- and short-term estimates. This suggests that the Alpine Fault slip-rate has been approximately consistent for ~23 Ma. Thermobarometry indicates that peak two-pyroxene granulite facies and retrograde metamorphism occurred at 880 ± 70 °C and 4.5 ± 1.5 kb, and 663 ± 33 °C and 2.2 ± 0.9 kb, respectively. These results, and the lack of high-pressure garnet granulite facies assemblages, indicate that the Glenroy Complex experienced a clockwise pressure-temperature path. This suggests the Woodham Orthogneiss may represent magmas emplaced at a higher structural level that loaded the WFO causing garnet granulite facies metamorphism. After partial exhumation during mid-Cretaceous continental extension, which preceded rifting of New Zealand from Pacific Gondwana, the Glenroy Complex remained at ~350 °C from ~100–80 Ma. During Late Cretaceous–Middle Eocene continental extension, the Glenroy Complex was dissected by normal faults, which initiated cooling below ~350 °C at 16–28 °C/Ma. Faults in the western Glenroy Complex were active earlier than those in the east. Consequently, the Woodham Orthogneiss experienced differential exhumation – western and eastern parts cooled from ~350–200 °C between ~80–70 Ma and ~50–45 Ma, respectively. After reaching ~200 °C, the temperature-time paths of the Glenroy Complex began to converge, because differential exhumation was no longer occurring, and cooling slowed to ~4 °C/Ma, which lead to surface exposure at ~15 Ma. The slow, consistent cooling rate suggests that the Big Bend had not yet formed. Development of the Big Bend during the Middle Miocene resulted in exhumation of the Alpine Fault hanging wall, which loaded the Australian Plate creating a foreland basin. Hence, shortly after reaching the surface, the Glenroy Complex was buried by ~3 km of sediments, which caused rapid (~44 °C/Ma) reheating to ~80 °C that lasted for ~4 Ma, causing partial annealing of apatite fission tracks. A need to accommodate shortening associated with the Big Bend resulted in the Glenroy Complex being thrust over the foreland basin eastern margin during the Late Miocene–Early Pliocene. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/4715">http://hdl.handle.net/10523/4715</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. southest Nelson Thesis description Number of pages, maps, CDs, etc. xxiv, 316 pages A4 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2014Sagar Creator An entity primarily responsible for making the resource Sagar, Matthew William (Matt) Date A point or period of time associated with an event in the lifecycle of the resource 2014 Title A name given to the resource Geology, petrology and thermochronology of the Glenroy Complex and associated granitoids, southeast Nelson, New Zealand Subject The topic of the resource Igneous geology Metamorphic geology 40Ar/39Ar Alpine Fault Australian-Pacific plate boundary Big Bend Darran Suite exhumation Fission-track geochemistry Glenroy Complex gneiss Gondwana granite Granulites LA-ICP-MS metamorphism Nelson New Zealand Separation Point Suite thermobarometry thermochronology U-Pb zircon geochronology Western Fiordland Orthogneiss https://theses.otagogeology.org.nz/files/original/eb7251fe3a008bcd49c2bca3703351a8.pdf 5afeb5c84ec16d7b7060a7a6d574df13 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((169.759699482432978 -46.397013858403184,169.864123147323397 -46.424693929299991,169.700107640613282 -46.56295480864263,169.397355890733195 -46.650969151333797,169.051867395130131 -46.703373895657478,168.880410001258809 -46.682078628519093,168.866241018862468 -46.650131915565112,169.074442012312772 -46.640330536834405,169.420759882790037 -46.568833674658975,169.643267546164907 -46.49938438533519,169.759699482432978 -46.397013858403184)) Author last name Last name of the Author Keeman Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Palin, J.M. Abstract The Abstract for this thesis The provenance of the Murihiku Terrane has been investigated using petrography, geochemistry and geochronology on igneous, mainly plutonic, clasts found in rare conglomerates along the Catlins Coast, southeastern New Zealand. Late Triassic (Oretian) conglomerates at Roaring Bay and Middle Jurassic (Temaikan) conglomerates at False Islet, Waikawa, and Slope Point have been studied in detail. These are generally polymict, poorly sorted, and pebble to cobble (uncommonly boulder) grade. The mid-Jurassic conglomerates were deposited in a fan-delta to terrestrial setting. Rounded to subrounded volcanic clasts dominate with subordinate volcaniclastic, plutonic (c. 15%), and rare metamorphic clasts. The 18 plutonic clasts geochemically analysed (whole-rock; ICP) range from quartz monzodiorite to alkali feldspar granite (59–79 SiO2 wt%) and generally have subduction-related arc geochemistries. The majority are I-type but a small number have weak A-type affinities, and one is strongly A-type. Three volcanic clasts were also analysed. Three of the 21 total clasts analysed have adakitic (HiSY) affinity. Subduction-related characteristics are seen such as negative Nb and Ta anomalies. Clasts from all the conglomerate horizons have petrographic similarities. Zircons from 13 plutonic clasts have been dated by LA-ICP-MS yielding the following 208Pb-corrected concordia ages with 2σ errors. The main clast age cluster is broadly Middle Permian (258 ± 3 Ma, 263 ± 2 Ma, 266 ± 3 Ma, 268 ± 3 Ma, 269 ± 3 Ma, 270 ± 3 Ma, 272 ± 2 Ma). In addition there are clasts with younger Triassic (218 ± 2 Ma, 240 ± 3 Ma) and Jurassic (168 ± 2 Ma, 187 ± 2 Ma), and older latest Carboniferous (300 ± 3 Ma) and mid-Carboniferous (333 ± 3 Ma) ages. An igneous clast with an age that is penecontemporaneous with its depositional age was found in both a Middle Jurassic and Late Triassic conglomerate. It is possible that the False Islet, North Head, and Slope Point conglomerates have the same broad depositional age, and could represent the same stratigraphic level. Many of the analysed clasts show similarities with units within the adjacent Median Batholith on the basis of their combined petrography, geochemistry and age characteristics. The Darran Suite shows an excellent match with the 168 Ma clast (Rakeahua Pluton and Hunter Intrusives), and the 218 Ma clast with Mistake Suite. The 300 Ma A-type alkali feldspar granite clast is comparable to the Freds Camp Pluton of the Foulwind Suite, and the 333 Ma clast may be from a younger Tobin Suite member such as the Lake Roxburgh Tonalite. The Permian cluster is difficult to correlate with New Zealand rocks. Alternatively, the source of these may extend to the voluminous Mesozoic to Late Palaeozoic batholiths that occur in formerly contiguous eastern Australia and West Antarctica. This study has shown that conglomerates can be an important tool when investigating the provenance of a sedimentary tectonostratigraphic terrane. Conglomerate clasts provided hand specimen size samples of source rocks to the Murihiku Terrane. This size of sample allowed for much more extensive geochronology, petrography, and geochemistry analysis than could be otherwise carried out on detrital grains within the dominant finer grained sandstone lithologies. Conglomerate clasts therefore provide more robust evidence to any provenance determinations. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/4964">http://hdl.handle.net/10523/4964</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Catlins Coast Southland Thesis description Number of pages, maps, CDs, etc. xiv, 308 pages A4 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2014Keeman Creator An entity primarily responsible for making the resource Keeman, Jelte Cornelis (Jelte) Date A point or period of time associated with an event in the lifecycle of the resource 2014 Title A name given to the resource Provenance and age of igneous clasts in Mesozoic Murihiku conglomerates, Catlins Coast, New Zealand Subject The topic of the resource Igneous Petrology conglomerate geochronology Gondwana Igneous clasts LA-ICP-MS Median batholith Murihiku Terrane provenance U-Pb zircon dating https://theses.otagogeology.org.nz/files/original/b3faef444a9d4e79e092bcb855a2e6e3.pdf 39b1a01c55ffc435f42c22d7f64bb711 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Author last name Last name of the Author Rodway Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Palin, J.M. Abstract The Abstract for this thesis The provenance of sediments in the Western Southland Basins has been investigated using Ti-in-quartz geothermometry in conjunction with cathodoluminescence imaging, petrography and zircon geochronology. Data from the Fiordland basement along with the Te Anau, Waiau, Balleny and Winton basins are reported and used to interpret basin and source correlations, history, and regional tectonic evolution. Ti-in-quartz analysis yields unimodal peaks for all samples and equilibration temperatures that fall within a relatively restricted range. The data are useful in making empirical comparisons between: basement rocks and sediment, the different basins sampled and sediments within these basins. Differences between samples allows for discrimination between individual samples and basins. Similarities between samples are consistent with previous correlations. The data suggests a shift in Ti-in-quartz temperatures in relation to the stratigraphic sequence. Absolute Ti-in-quartz temperatures of Eastern Fiordland granite and numerous basin samples systematically yield equilibration temperatures below the wet granite solidus. This limits the resolution of the technique. Detrital zircons from five of the six samples analysed show an almost absolute dominance of Early Cretaceous U-Pb ages. This is consistent with the interpretation of an Eastern Fiordland provenance for these five samples. The Blackmount Formation is strikingly different and appears not derived from Fiordland but from rocks of New Zealand’s Eastern Province. Subtle features displayed in the Ti-in-quartz geothermometry and zircon geochronology results suggest migration of the sediment sources from the Eocene through to the Miocene. A combination of all information acquired is used to consider basin and regional tectonic evolution. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/2486">http://hdl.handle.net/10523/2486</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. western Southland Thesis description Number of pages, maps, CDs, etc. xxi, 218 p. : ill. (some col.), col. maps ; 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2012Rodway Creator An entity primarily responsible for making the resource Rodway, Ewen Maurice Date A point or period of time associated with an event in the lifecycle of the resource 2012 Title A name given to the resource Ti-in-quartz geothermometry and sediment provenance in the Western Southland basins Subject The topic of the resource Geochemistry Petrology Ewen Fiordland geothermometry New Zealand Palin provenance quartz Rodway Southland Te Anau titanium Waiau Western https://theses.otagogeology.org.nz/files/original/25c7c1eeea66f7f274cd106a5541b495.pdf 4f218cc2e5d1ec1dbce62833379de8c6 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((168.213944620626648 -46.503055367676893,168.291425198663717 -46.506850039084377,168.269467965246491 -46.56576677324562,168.198178840135995 -46.559741340039096,168.213944620626648 -46.503055367676893)) Author last name Last name of the Author Cross Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Palin, J.M. Abstract The Abstract for this thesis The Greenhills Complex is a composite ultramafic to mafic layered igneous intrusion located on the Bluff Peninsula, 30 km south of Invercargill. Two principal lobes range from dunite at their base through olivine clinopyroxenite to gabbro. On the basis of crystallisation sequence, mineral composition and melt inclusion compositions (Spandler et al., 2000), the intrusion appears to have formed from primitive hydrous basaltic magmas in feeder chambers beneath an island arc volcanic complex as part of the Permian Brook Street Terrane. Dunite of the south lobe is well exposed in the Greenhills Quarry. The dominant primary mineral is cumulus olivine with minor cumulus chromian spinel, intercumulus clinopyroxene and rare orthopyroxene and plagioclase. A series of dykes of varying composition cross cut the dunite, forming small zones of plagioclase-rich rocks. A number of zircon grains extracted from a plagioclase-rich felsic dike intruding the dunite of the Greenhills complex have been dated using LA-ICP-MS analysis of U/Pb isotope ratios to an age of 261.5 ± 2.3 Ma. This is consistent with the minimum age of 246 ± 10 Ma obtained from K/Ar dating of hornblende in gabbroic rock by Aronson (1968) and the age reported by Spandler et al. (2003) of 265 Ma obtained by Kimbrough et al. (1992) using U/Pb isotope ratios. Spandler et al. (2000) report the occurrence of platinum-group minerals (PGM) in chromian spinel at one location just south of the Greenhills dunite quarry. LA-ICP-MS analysis of chromian spinel in this study has revealed ppb concentrations of PGE and ppm concentrations of gold in a small number of chromian spinel grains. Olivine in the dunite is fractured and partially replaced by serpentine and carbonate. XRD analysis of nine alteration rims of the dunite and one white vein has identified calcite, chlorite, chrysotile and other rarer phyllosilicates. L.O.I. analysis reveals the average volatile component of the dunite to be 7.74 wt% while bulk rock volatile element (CNS) analysis reveals the average concentration of naturally occurring carbonates in the dunite to be 0.6 wt% per sample with some samples having as much as 4.5 wt% carbonate and up to 11.5 wt% H2O. Recent studies have shown that natural rates of carbonation of olivine-rich peridotite (Keleman & Matter, 2008) and serpentinite mine tailings (Wilson et al., 2009) are much faster than previously thought. These rates should be further enhanced in the subsurface because the carbonation reactions are exothermic and, in the case of serpentine-bearing rock, lead to increased porosity. If the dunite has sufficient fracture permeability at depth, it is conceivable that CO2 could be injected at a flow rate sufficient for heating due to carbonation to balance cooling due to advection and diffusion in order to maintain an optimal temperature for rapid reaction. Alternatively the natural rates of carbonation of olivine at the surface can be enhanced by simply crushing and spreading on the Earth’s surface (Schuiling and Krijgsman, 2006). When mixed with a slow release fertiliser, crushed dunite could potentially act as a cheaper substitute for lime. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/2043">http://hdl.handle.net/10523/2043</a> OURArchvive access level Abstract Only Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Green Hills Southland Thesis description Number of pages, maps, CDs, etc. vi, 86 leaves : ill. (some col.) ; 30 cm. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2011Cross Creator An entity primarily responsible for making the resource Cross, Anthony James. Date A point or period of time associated with an event in the lifecycle of the resource 2011 Title A name given to the resource Greenhills Complex Dunite: Mineralogy, Petrology, Geochemistry and Potential for Carbon Sequestration Subject The topic of the resource Petrology geochemistry Bluff Peninsula Brook Street Terrane carbon sequestration chromian spinel dunite geochronology Greenhills Complex igneous complex laser ablation inductiv petrology platinum group elements platinum group minerals U/Pb dating ultramafic zircon https://theses.otagogeology.org.nz/files/original/54a65a52b664092f4c864fbecf6bfeeb.pdf f67735fe7d46f366e5d21931f4846aa3 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((163.51796987207328 -79.117033434886579,163.316711702873562 -79.250702116712105,162.587428940190193 -79.20637268614216,161.374780120602281 -79.12804342787328,159.852029996568433 -79.021251358902745,160.054225218050334 -78.909021516065479,160.174069596234887 -78.841362589513821,160.195221475082519 -78.829331620800204,160.240202151822842 -78.803656908542351,160.267247414585256 -78.788160294046023,160.444048222510474 -78.68574345949186,160.550735279900863 -78.622993460720011,161.132484113033513 -78.267675565089718,161.369320508132802 -78.116330973777607,161.37788099027614 -78.110784801515251,161.432520491913806 -78.075258242852868,161.49739750788649 -78.080055046342423,161.839747257784694 -78.105059450528444,161.994023113846879 -78.116159074052405,162.007047389816393 -78.117091362381188,162.392982814988756 -78.144381942682159,162.521412492366551 -78.153320528971605,162.544050376938856 -78.154888735378563,162.549828014784254 -78.155288619674636,162.567466868901477 -78.156508558872986,162.627000327708657 -78.160616138052802,162.752444164408416 -78.169221494525672,163.022634293744574 -78.187527903959761,163.05659484093735 -78.189806869804784,163.428357826602706 -78.214435253501506,163.441323801388563 -78.215283696950735,163.604408787668177 -78.225895082769853,163.620311001580717 -78.226923820518422,163.94341198329613 -78.247597118927885,164.086523095636579 -78.256615260407415,164.262323738480376 -78.267577413480822,164.372748812889512 -78.274397914040435,164.470315588489228 -78.280382530086953,164.556468589723067 -78.285634608412707,164.632111397920994 -78.29022093665516,164.65660632974587 -78.291701089635879,164.656606843479665 -78.291701120721555,164.630777329187936 -78.311839110512864,164.612216200999711 -78.326266762639165,164.557982328973793 -78.368215768190026,164.553163972372346 -78.371927828837343,164.477628770719463 -78.429805959042625,164.45392014501607 -78.44785151447914,164.364955183519925 -78.515057268720028,164.359704446412479 -78.518998847651645,164.265856514741841 -78.58898501930031,164.260074502234716 -78.593268427651708,164.152964126278192 -78.672027861183167,164.125787870668546 -78.691834506770746,163.949080296831397 -78.81891635445821,163.678871259895828 -79.007691262474765,163.51796987207328 -79.117033434886579)) Author last name Last name of the Author Read Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Cooper, Alan Reay, A. Palin, J.M. Abstract The Abstract for this thesis The Koettlitz Glacier Alkaline Province, in southern Victoria Land, Antarctica, is characterised by Late Neoproterozoic, extension-related plutonism. Stretching 100 kilometres along the Hillary Coast from the Radian Glacier, in the north, to the Mulock Glacier, in the south, the Koettlitz Glacier Alkaline Province is exposed over at least 2000 km². The oldest intrusions dated during this study are mafic members of the Glee Suite, a suite ranging from 46 wt% SiO₂ alkaline gabbros to 68 wt% SiO₂ quartz monzonites that crop out in the north of the studied area, between the Kempe and Panorama Glaciers. Enriched in Ti, Fe, Mn, K, P & Ba, the Glee Suite comprises borderline subalkaline/alkaline, metaluminous, calc-alkalic/alkali-calcic, transitional basalts and derivatives. Initial epsilon Nd ( -2.58) and initial ⁸⁷Sr/⁸⁶Sr (0.708) values are more primitive than most nearby intrusions, indicating lesser crustal input in the Glee Suite. Zircon ages of 553 ± 5 Ma & 550 ± 5 Ma date emplacement, while titanite ages of 538 ± 2 Ma & 534 ± 1 Ma date subsequent deformation then cooling. Geochemical characteristics of the Glee Suite imply emplacement into a failed intra-continental rift. The alkaline gabbroic components of the Glee Suite are geochemically equivalent to alkaline components of the nearby Panorama Pluton and Dromedary Mafic Complex. The Skelton Mafic Suite, which crops out on both sides of the Skelton Glacier in the vicinity of Cocks Bluff, ranges from magnesian, calcic, 48 wt% SiO₂ gabbros to ferroan, calc-alkalic, 59 wt% SiO₂ monzonites. This array is a result of fractional crystallisation from a gabbroic end member such as sampled at Breezy Bluff, one kilometre northeast of Cocks Bluff. Zircon and titanite from the Skelton Mafic Suite have been dated at 548 ± 2 Ma and 547 ± 4 Ma, respectively, indicating emplacement at this time. The subalkaline Skelton Mafic Suite is part of a broader mafic association within the Koettlitz Glacier Alkaline Province that contains both subalkaline and alkaline components. This association includes the Panorama Pluton (557 ± 5 Ma) and the Dromedary Mafic Complex. The outcrop characteristics and geochemical nature of these subalkaline-alkaline mafic intrusions indicate emplacement in a transitional compressional / extensional tectonic setting. The most characteristic suite in the Koettlitz Glacier Alkaline Province is the Hillary Suite that comprises high-silica, A₂ group, A-type granitoids and subordinate syenites. Members of the Hillary Suite are enriched in Si, Fe, Na, K, Ga, Nb, La, Nd, Rb, Y, Pb, Th & U and depleted in Al, Mg, Ca, Ba & Sr. Strong enrichment in REE, particularly the LREE (La(N)/Lu(N)=5-40), and large negative Eu anomalies (Eu/Eu*=0.04-0.53) are apparent in all samples. The Sm-Nd & Rb-Sr isotopic character of the Hillary Suite (initial epsilon Nd = -4.5 to -7.5 and initial ⁸⁷Sr/⁸⁶Sr 0.708-0.710) suggests derivation from crustal rather than mantle source rocks. New Hillary Suite emplacement ages of 550 ± 3 Ma, 548 ± 4 Ma, 546 ± 3 Ma, 546 ± 3 Ma and 542 ± 3 Ma are all Late Neoproterozoic. The geochemical nature, geographic spread and emplacement ages of the Hillary Suite indicate that the Koettlitz Glacier Alkaline Province was the site of broad crustal extension during the Late Neoproterozoic. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/5428">http://hdl.handle.net/10523/5428</a> OURArchvive access level Open Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. southern Victoria Land, Antarctica Thesis description Number of pages, maps, CDs, etc. 630pp total Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2010Read Creator An entity primarily responsible for making the resource Read, Stephen E Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Koettlitz Glacier Alkaline Province : Late Neoproterozoic extensional magmatism in southern Victoria Land, Antarctica Subject The topic of the resource Plutonic Alkaline Province Antarctica https://theses.otagogeology.org.nz/files/original/26d5e1c934bf4eb18609d5dc45d12860.pdf 7db1ecc06f212fab11cbf6cfe7c3f9ff Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Author last name Last name of the Author Brown Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Palin, J.M. Abstract The Abstract for this thesis The New Zealand micro-continent has been described as an amalgamation of various tectonostratigraphic terranes which were accreted on to the Gondwana margin. The origin of the accreted terranes is important in the understanding of Phanerozic Pacific tectonics. This study aims to help in the understanding of the provenance of the Torlesse terrane, which has been subject to extensive geological research for decades. A conglomerate horizo11; located on the southeast side of Lake Hawea was examined with the aim of using the conglomerate clasts to provide provenance information on the Torlesse terrane, in particular the Rakaia terrane. Conglomerate clasts are coarsegrained hand specimen size samples of the source rock, which have thought to have travelled a shorter distance than the fine-grained detrital material which make up the Otago Schist and therefore are able to be used to trace proximal sources. The size of the clasts also allowed for much more extensive geochronological, geochemical, petrographical and geothermometry analysis than that of the fine-grained lithologies within the schist and therefore provide a more confident indicator of provenance. An additional goal of the studywas to understand the effect of metamorphism and deformation on the clasts. Based on geochemical and mineralogical observations, the majority of the clasts can be classified as fractionated I-type tonalite. Petrographic observations show that the clasts have been subject to low grade metamorphism, with the presence of recrystallised quartz and microfractured feldspar, pressure shadows and growth of stilpnomelane. Petrographic and geochemical observations indicate that the clasts have been subject to metasomatic additions ofNa20, Si02 and C02 and the removal ofK20, Rb and Ba during progressive metamorphism and deformation. Titanium (Ti) concentration in quartz grains for the three localities was determined by LA-ICP-MS. These data were combined with the revised calibration of Thomas et al. (2010) to estimate crystallization temperatures. Results show that at low metamorphic grades the original igneous Ti-in-quartz temperature was preserved, but with increasing metamorphic grade and textural zone the temperatures re-equilibrate. 111 U-Pb zircon ages for the five selected clasts and a schist sample were determined by LA-ICP-MS. Four igneous clasts yield crystallisation ages, 253±3 Ma, 298±3 Ma, 332±7 Ma and 339±6 Ma. A quartzite sample has detrital zircons that range in age from 440 to 2650 Ma. Detrital zircons within a schist sample showed a prominent Permian to Triassic age peak and correlate well with the ages of the clasts. The crystallisation ages of the clasts and the detrital ages of the schist and quartzite broadly correlate best with crystallisation ages of igneous complexes located within Western Antarctica. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Hawea Thesis description Number of pages, maps, CDs, etc. vii, 137 : ill. (some col.), maps ; 30 cm Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2010Brown Creator An entity primarily responsible for making the resource Brown, Kirstin Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Provenance and metamorphism of conglomerates within the Otago schist, Hawea Subject The topic of the resource Geochemistry Hawea metamorphism Otago Schist provenance https://theses.otagogeology.org.nz/files/original/a38eb3b88ce9eb29671bf9c0554274b9.pdf b2be0493a72e5262c9e103d4fd1bd4d7 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format MULTIPOLYGON (((168.289025947832073 -44.556205842029527,168.25783549298103 -44.656142422435245,168.235549328610517 -44.704039793376978,168.133379315283719 -45.00515557092853,168.145671228285067 -45.11762260977379,168.174149534366876 -45.258164325873707,168.210282087288135 -45.38949286106007,168.240535598453391 -45.562004871214185,168.253986719718029 -45.583405572557787,168.278536734784808 -45.604074091579307,168.335953286580406 -45.648117278630544,168.379574082381851 -45.664779102154853,168.407690038934334 -45.684373070938719,168.407728678184498 -45.704618734160562,168.390169340733621 -45.721772499237211,168.318650086444194 -45.692659728521171,168.214722566426644 -45.616298282230957,168.184108366215952 -45.592382733648584,168.129868418977168 -45.39596856732846,168.068243606567876 -45.171816543794698,168.067602138129303 -45.003874921733171,168.185899293680279 -44.733839217537906,168.26566167766282 -44.554972645299216,168.289025947832073 -44.556205842029527)),((168.289025947832073 -44.556205842029527,168.289391225577901 -44.555033082645018,168.289295251419389 -44.556220028083551,168.289025947832073 -44.556205842029527)),((173.096746639994905 -41.718346011007576,173.018032613322333 -41.75591959311015,172.924959041773405 -41.739810418476793,172.936946882148789 -41.6826222856416,172.965588596028653 -41.625438519808043,173.015595540529262 -41.548584707492282,173.060732799217959 -41.473498225272913,173.127109826913198 -41.387646842503912,173.226540532460319 -41.314207988255383,173.335302785366082 -41.256743092110511,173.406030853544735 -41.20289043665646,173.523866745119022 -41.139851756920784,173.608242115022904 -41.058998242226437,173.725548523701775 -40.988604980486933,173.774040976614685 -40.898911055871267,173.792246978049661 -40.845159694610025,173.826643444634101 -40.771626401237498,173.877663259071056 -40.717620922412401,173.943087754169994 -40.692078082776156,174.011376382755259 -40.704013399679241,174.026044589227638 -40.741423949915962,173.951915637400987 -40.817138703647529,173.896413690600383 -40.889086889636658,173.822284418342747 -40.989743080327685,173.719541592584562 -41.086957581130335,173.562032968080757 -41.178997193847174,173.352094773088368 -41.296017647759228,173.165239078237164 -41.448371534307157,173.105992898087777 -41.537812478248185,173.108500391851834 -41.614668172717138,173.096746639994905 -41.718346011007576))) Author last name Last name of the Author Jugum Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PhD Advisers Who supervised/advised this student Norris, R.J. Palin, J.M. Craw, D. Abstract The Abstract for this thesis Abstract The Dun Mountain Ophiolite Belt (DMOB) is an Early-Permian ophiolite sequence exposed in the South Island of New Zealand. The ophiolite is overlain by the thick deep-marine sedimentary Maitai Group. The Alpine Fault divides the DMOB into two sections, one in Nelson and the other in Southland. The DMOB is divided into three different units based on lithology and geochemistry: the Livingstone Ophiolite, which is a typical ophiolite sequence dipping sub-vertically and facing west; the Otama Melange, a deformed ocean-floor assemblage with no ultramafics or serpentinites and a greater amount of felsic rocks than the other two units; and the Patuki Melange, a highly deformed ophiolite structurally beneath the Livingstone Ophiolite. The Livingstone Ophiolite has three phases of igneous activity. The first phase is represented by cumulates, massive gabbro, and extensive pillow lavas. It has a MORB-like geochemistry with a subtle above-subduction signature. The age of this phase is 277.6 ± 3.3 Ma using U /Pb in zircon. The second phase locally intrudes the first with dykes which are feeders for extensive non-pillowed lava flows of variable thickness. The age of the second phase (275.2 ± 5.4 Ma) cannot be distinguished from the first. The second phase has a stronger above-subduction geochemical signature than the first phase. The third phase comprises felsic and intermediate dykes that cut the first two phases and intrude into the sediments overlying the DMOB. This phase has not been directly dated but has the same geochemistry as the felsic rocks in the Otama Melange. The igneous rocks of the Otama Melange are 50% felsic and have an age of 269.3 ± 4.5 Ma. The mafic and felsic rocks from the Otama Melange have a strong above-subduction geochemistry, but are not typical of arcs. The Patuki Melange contains both MORB-like and OIB igneous rocks in a serpentinite matrix. The MORB-like Patuki Melange is similar to the first stage of igneous activity in the Livingstone Ophiolite. Sediment blocks within the Patuki Melange have been correlated with the Maitai Group, based on their petrology and detrital zircon age pattern. These sediments have a youngest detrital zircon age of Late Permian through to the Early Triassic. The Maitai Group sediment are distal in character within the Patuki Melange and more proximal above the Livingstone Ophiolite. I infer that the Livingstone Ophiolite represents a fore-arc, and the Otama Melange a localization of the Livingstone ophiolites stage three igneous activity in that fore-arc (possibly due to ridge subduction). The Patuki Melange is either an off-scraping of a subducted slab or part of the trench wall of the above-subduction crust. The DMOB may have been part of the same ocean-crust as the Brook Street Terrane during its formation, but there is no specific evidence for this. Detrital zircons from the Caples Terrane are almost exclusively Triassic in age. The Maitai Group may have some time overlap with the oldest Murihiku Terrane. The DMOB is identical in geology and age to the Yakuno Ophiolite in Japan which may have once been part of the same subduction-zone before the opening of the Neo-Tethys. Detrital zircons from the Aspiring Terrane have a Jurassic age 154.1 ± 2.0 Ma, which constrains the age of the metamorphism of the Haast Schist. The DMOB has been highly deformed with evidence for extensional structure reactivated in compression on the sea-floor during igneous activity; however, most of the observed internal deformation in the DMOB is Cenozoic in age. The serpentinites are completely overprinted by the oblique compression through New Zealand since the Miocene. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Dun Mountain Ophiolite Belt Thesis description Number of pages, maps, CDs, etc. xx, 346 p. : maps, col. ill ; 30 cm. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/6875">http://hdl.handle.net/10523/6875</a> OURArchvive access level Open Access Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2009Jugum Creator An entity primarily responsible for making the resource Jugum, Dushan Date A point or period of time associated with an event in the lifecycle of the resource 2009 Title A name given to the resource Tectonic synthesis of the Dun Mountain Ophiolite Belt Subject The topic of the resource Map Structural geology Dun Mountain melange Structual geology