1 10 5 https://theses.otagogeology.org.nz/files/original/5cfbfcec2595f03db3591885da38e789.pdf 4bc9f16e64dceeeb2b149cbf894ac3b7 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 Simpson 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 Lower Paleozoic rocks crop out along the length of the western South Island, forming New Zealand's oldest crust. They represent a sliver of the immense pile of sediments and volcanics that accumulated along the Paleo-Pacific margin of Gondwana. In NW Nelson, these rocks comprise two distinct tectonostratigraphic terranes, the Ordovician to Devonian Buller Terrane and Cambrian to Devonian Takaka Terrane. Low- to medium-grade metasedimentary and metavolcanic rocks of the Fanny Bay, Edgecumbe and Cameron Groups in Southwest Fiordland, have been proposed to represent a southern extension of these terranes on the basis of rare fossils and lithology. A thorough understanding of their tectonostratigraphic relations have, however, been impeded by the intensity of multiple episodes of metamorphism and deformation. This study, impelled by the GNS Science QMap Fiordland programme, provides geochemical and geochronological constraints upon the stratigraphy, depositional ages, provenance and correlations of these rocks. Whole-rock major and trace element compositions of metasedimentary samples are consistent with those of continent-derived passive margin sediments. REE patterns are uniform, with ubiquitous negative Chondrite-normalised Eu-anomalies (EuN/EuN* = 0.4 to 0. 7) signifying an upper continental crust source. Initial N d isotope values ( ENct = -7.2 to - 9.6 at 460 Ma) indicate that this crust was Proterozoic in age and chemical index of alteration values (CIA= 48-83) and oxygen isotope values (8 180 = +10.6 to +19.1) suggest it was moderately weathered. Subtle variations between the lithostratigraphic groups are also evident. Low CIA values (<58) and Th/Sc ratios(< 1) suggest a less mature, arc source of sediment in samples of the Edgecumbe Group. Elevated Ba (:::=: 1300) and V/Sc (20 to 86) in Cameron Group and correlative samples are indicative of a pelagic sediment component. Mafic metavolcanic rocks of the False Edgecumbe Formation exhibit high V/Ti ratios and REE patterns closely resembling those of arc volcanics in the Takaka Terrane. Distributions of concordant to slightly discordant U-Pb ages of detrital zircons (418 of 514 grains analysed) from two Fanny Bay and five Edgecumbe Group psammites are strikingly similar with two major peaks at 500-700 Ma (Ross-Delamerian and Pan-African) and 950- 1150 Ma (Grenvillian), with minor peaks at ea. 1400 and 1700 Ma, and scattered Archean ages. Similar detrital zircon age spectra have been reported for lower Paleozoic metasedimentary rocks from throughout eastern Australia and Antarctica and appear to be a characteristic of sediment deposited along the Paleo-Pacific margin of Gondwana. Zircons with trace elements diagnostic of alkaline rock parentage (Y <400 ppm, Lu<20 ppm) in the 500-700 Ma age populations suggest a sediment source in either East Africa or ice-covered East Antarctica. Upon the basis of their youngest zircons, Fanny Bay Group samples give maximum depositional ages in the earliest Ordovician (480-490 Ma), in agreement with previous fossil evidence, while the five Edgecumbe Group samples have slightly older maximum depositional ages ranging from early to mid-Cambrian (507-540 Ma). These and other geochemical characteristics support previous correlations of the Fanny Bay Group with the Buller Terrane. Definitive identification of an extension of the Takaka Terrane into Southwest Fiordland is more difficult due to similarities in the geochemistry and detrital zircon geochronology of the sedimentary successions in both terranes. These similarities extend throughout the Western Province indicating that the early Paleozoic terranes were in close proximity. That such similarities reach as far as the Australian and Antarctic fragments of the Paleo-Pacific Gondwana margin suggests that an extensive highland source provided detritus to a great marginal basin where efficient mixing allowed for the homogeneity of geochemical characteristics and detrital zircon signatures. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Fiordland southwest Thesis description Number of pages, maps, CDs, etc. xiii, 186 p. : ill., 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 2006Simpson Creator An entity primarily responsible for making the resource Simpson, Chloe Charlotte. Date A point or period of time associated with an event in the lifecycle of the resource 2006 Title A name given to the resource Early Paleozoic metasedimentary rocks of Southwest Fiordland, New Zealand : petrology, geochemistry, and detrital zircon geochronology Subject The topic of the resource Petrology Geochemistry Paleozoic detrital zircon geochronology metasediments zircon https://theses.otagogeology.org.nz/files/original/b439a02e201307969a64200964352929.pdf 2004c133cbecab7ca4987d86e0d74720 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 ((169.623945752000054 -46.361348229999976,169.586018962000026 -46.339589546999946,169.588986728000123 -46.289717161999931,169.610120442000039 -46.271260832999985,169.629175126000064 -46.272122759999945,169.623945752000054 -46.361348229999976)) Author last name Last name of the Author Simpson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Landis, C.A. White, J.D.L. Abstract The Abstract for this thesis This project examines the boundary between the Murihiku and Dun Mountain - Maitai Terranes, as well as the intervening strata of the Kaka Point Structural Belt, South-East Otago. Strata ofthe Murihiku and Dun Mountain -Maitai Terranes can be correlated with previously mapped units found inland, whereas the Kaka Point Structural Belt lacks clear correlatives. The Kaka Point Structural Belt shows both similarities and differences to both the Murihiku and Dun Mountain -Maitai Terranes, with previous authors provisionally including it within the Dun Mountain -Maitai Terrane. However, based on evidence from this field area, the Kaka Point Structural Belt is interpreted as a separate, "suspect" terrane. Within this field area the Dun Mountain -Maitai Terrane is represented by ophiolitic sea floor that was metamorphosed (Otanomomo Complex), then brecciated (Telford Breccia), and overlain by sedimentary rocks derived from a volcanic arc. Sedimentary features indicate deposition via storm-generated currents. The Kaka Point Structural Belt represents the deformed remnants of a turbidite filled basin, with the volcanic arc derived sediment originating from the east. Sediments were deposited either in a forearc or backarc basin setting. The Murihiku Terrane represents a large turbidite filled basin in which a regressive wedge propagated from southeast (arcwards) to the northeast (trenchwards). Most evidence favours a forearc basin setting although some evidence suggests it may have been a backarc basin. Outcrops of the Dun Mountain -Maitai Terrane and Kaka Point Structural Belt appear to be structurally controlled, with the structure developed during terrane amalgamation. Terrane amalgamation is responsible for the large scale folding of the Southland Syncline. Minor faulting and folding may also be the result of this terrane amalgamation during the Rangitata Orogeny. Evidence is also presented from mineral assemblages that suggest far greater burial depths for the Murihiku Terrane than for the adjacent Kaka Point Structural Belt and Dun Mountain -Maitai Terrane, thus implying a "boundary fault" is present between the Murihiku Terrane and the Kaka Point Structural Belt. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Murihiku Terrane Maitai Terrane Kaka Point structural belt Dun Mountain Thesis description Number of pages, maps, CDs, etc. ix, 144 leaves : ill. (some col., some folded), maps (some col, some folded) ; 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 2002Simpson_B Creator An entity primarily responsible for making the resource Simpson, Brent Andrew. Date A point or period of time associated with an event in the lifecycle of the resource 2002 Title A name given to the resource Murihiku-Maitai terrane boundary, South East Otago Subject The topic of the resource Structural geology Otanomomo Complex Telford Breccia terranes turbidites https://theses.otagogeology.org.nz/files/original/1b323f9ae92184c0d8880019e7567d26.pdf eb04ac29c0462a869c1e170459b84722 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 ((159.701562151753649 -79.898726202994766,159.646448309936801 -79.933209650404891,158.075354712292977 -79.856145883202686,158.276799991970734 -79.705445241118397,158.583655096899292 -79.466958928426791,159.560981854694745 -79.507191108817565,160.19976352000171 -79.531726525777572,160.261689537191444 -79.534031826893013,160.174000952035072 -79.592894600171263,160.0499388190795 -79.675026854113057,159.701562151753649 -79.898726202994766)) Author last name Last name of the Author Simpson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Cooper, A.F. Abstract The Abstract for this thesis A comprehensive study of the Darwin Glacier region has revealed at least four different styles of magmatism, creating the most diverse Cambrian magmatic region in southern Victoria Land. An alkaline suite, a calcic suite, an adakitic granitoid and a high-K dyke suite have been identified. The alkaline suite, the calcic suite and the adakitic granitoid were emplaced at mid-crustallevels (-16-21 km), compatible with the regional amphibolite facies metamorphic conditions of the country rock metasediments. Alkaline granitoids make up the Foggy Dog Granite (FDG) suite, which crops out at Pleasant Plateau and Cheney Bluff. The FDG suite is composed of moderately foliated, biotite-hornblende granites that show Fe20 3, Zr, Nb, Ga and Light Rare Earth Elements (LREE) (except Eu) enrichment and mineral chemistry (Mg# (100(Mg2+/Mg2++Fe2+)) less than 16) consistent with A-type granites. The suite is enriched in LREE relative to Heavy Rare Earth Elements (HREE) and shows significant negative Eu/Eu* anomalies (0.3-0.5). U-Pb isotopes indicate a crystallisation age of 536 ± 8 Ma. The FDG suite has isotopic and geochemical similarities to, and an emplacement age similar to, A-type granites found in the Koettlitz Glacier Alkaline Province (KGAP). The Darwin calcic suite is proposed to include the Cheney Bluff Granodiorite, the Blanks Granite and the Carlyon Granitoid. The Carlyon Granitoid makes up most of the Brown Hills and includes an variably foliated, biotite-hornblende granodiorite and granite. The Blanks Granite is a foliated, biotite granite pluton. The foliated, biotite Cheney Bluff Granodiorite intrudes the FDG suite at Cheney Bluff. The Darwin calcic suite post-dates the FDG suite and pre-dates the Cooper Granodiorite. The suite is a K-series, I-type, volcanic arc granitoid that is anomalously calcic and iron-rich compared to the DV1a suite and the Beardmore calcalkaline suite. The Darwin calcic suite is enriched in LILE (Rb, Ba, Sr, K, Th) and LREE (Ce, Nd) relative to N-MORB. Samples from the Carlyon Granitoid, the Blanks Granite and the Cheney Bluff Granodiorite all have negative Eu/Eu* anomalies (0.1- 0.3). The Cooper Granodiorite is an unfoliated, biotite-hornblende granodiorite that crops out north of the Brown Hills and west of Cheney Bluff. The Cooper Granodiorite is enriched in Sr and Na20 and depleted in Y and F~03 , relative to the Darwin calcic suite. Sr/Y ratios greater than 40 indicate an adakitic affinity. The Cooper Granodiorite has a similar geochemistry to the northern KGAP adakites and to the DVlb suite. The Cooper Granitoid has an re-interpreted U-Pb titanite crystallisation age of 515 Ma. There are two generations of felsic dykes in the Darwin Glacier region. The first generation is composed of highly fractionated dykes which intruded Darwin Glacier region plutons that were sufficiently hot, so chilled margins did not develop. The second generation is composed of high-K biotite aplites that intruded granitoids cool enough to induce rapid chilling. Both generations show similar chemistry to the FDG suite but are not enriched enough in Nb, Ce,Y, and Zr to be considered A-type granites. The second generation of aplites is similar to the DV2 suite of the Dry Valleys area. A highly oblique convergent margin formed in the late Proterozoic along the proto-Pacific margin of the East Antarctica Craton. This resulted in the formation of extensional jogs along the Transantarctic Mountains (TAMs), the largest of which produced the KGAP alkaline magmatism. Extension in the KGAP stretched the lithosphere, creating asthenospheric upwelling that melted the lower crust generating alkaline magmatism. Rotation of the interpreted plate vector initiated subduction first in the Darwin Glacier region, followed by the Dry Valleys region. The northern KGAP was isolated from subduction due to its orientation parallel to the relative plate motion. Approximately 15 Ma after subduction ceased, melting of either subducted lithosphere or a mafic underplate resulted in adakitic magmatism. Heterogeneous, evolved fractionates provided a source for the first generation of felsic dykes. Extension, uplift and partial melting of mantle and crusta} components resulted in the second generation of aplites. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/3222">http://hdl.handle.net/10523/3222</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. Antarctica Darwin Glacier Victorialand Antarctica. Thesis description Number of pages, maps, CDs, etc. xiv, 178, A60 p. : ill. (some col.), col. maps (2 folded) ; 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 2002Simpson_A Creator An entity primarily responsible for making the resource Simpson, Alanna Leigh. Date A point or period of time associated with an event in the lifecycle of the resource 2002 Title A name given to the resource Felsic magmatism in the Darwin Glacier region, southern Victoria land, Antarctica Subject The topic of the resource Igneous petrology Map Felsic magmatism magmatism https://theses.otagogeology.org.nz/files/original/5a63a25f2179e534865b5cf9552c336e.pdf 45d9eeee7a6ff6cfa0944f7522983cea 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 Simpson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Craw, D. Abstract The Abstract for this thesis Basement lithologies which form the basis of this report include Koettlitz Group metasediments along with diorites and gabbros of the Renegar Pluton. Metasediments are typically highly calcareous and include pelitic schist, mafic schist, felsic schist, calc-silicate, and marble. Also common are metamorphic veins which consist of quartz (dominant), feldspar, and calcite cores surrounded by a reaction zone comprising amphibole and/or diopside, plagioclase, quartz, and titanite. The Renegar Pluton forms a small body (approx. 4 x 10 km) which is elongate in a NE/SW orientation. lt is intruded into metasediments, the foliations of which are closely parallel to the margins of the pluton. Throughout the area mapped there is a close correlation between the extent of transposition, and the abundance of both metasomatic-derived calc-silicates, and metamorphic veins. Structural transposition aids in metasomatism by not only increasing the surface area of marble available for reaction but also by increasing the rate of reaction. Metasomatic decarbonation reactions then release large quantities of C02 (and Ca) rich fluid into the adjacent rocks to form veins. Reaction zones developed either side of the veins are the result of dehydration of the host rock, induced by an increase of xco2. In the less deformed regions chemical exchange between the vein and host rock can be described in terms of a simple closed system reaction approximated by diffusion metasomatic processes. However in intensely deformed regions higher fluid velocities were maintained and chemical components were lost from the rock as the result of veining. Such veins are best described in terms of infiltration metasomatism. Fluids were preferentially focussed within incompetent lithologies. However, within intensely veined units the addition of veins has had a strengthening effect on the rock type. The result is that further strain (and veining) is focussed elsewhere. The Renegar Pluton is an elongate reversely zoned body which comprises a core of gabbro cumulates surrounded by gabbroic differentiates and an outer ring of diorites. The contact between the gabbroic rocks and the diorites is highly intermixed forming a steeply dipping foliated zone which is parallel to the margins of the gabbro core. The rocks within the contact zone have undergone chemical mixing to form a suite of rocks which are chemically transitional to both the diorites and the non-cumulate gabbros. The diorites may have been derived by extraction of a combination of plagioclase, clinopyroxene, olivine (and minor orthopyroxene) from a gabbroic liquid. The gabbro cumulates are consistent with this. All rocks of the Renegar Pluton have undergone varying degrees of mineral reconstitution. Recrystallisation can be subdivided into two stages. The first of these probably occured late in the crystallisation history of the pluton, and involved uralitization. The second stage of recrystallisation was associated with deformation around the margin of the pluton. This involved the conversion of amphibole to biotite to form a foliated diorite-like rock termed the foliated marginal zone (FMZ). Despite being extensively recrystallised, these rocks have identical geochemistry to the undeformed diorites. Rocks of the Renegar Pluton are chemically and mineralogically indistinguishable from both the Dromedary Gabbro and the Dromedary Diorite. These rocks do not, however, appear to be genetically related to the Glee intrusives. This suite was probably formed by mixing the most mafic member of the Glee intrusives with a granite. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Antarctica Thesis description Number of pages, maps, CDs, etc. 1 v. (various pagings) : 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 1994Simpson Creator An entity primarily responsible for making the resource Simpson, Guy D. H. (Guy Donald Hugh), 1970- Date A point or period of time associated with an event in the lifecycle of the resource 1994 Title A name given to the resource Mid crustal processes : a study of fluid flow and deformation in the Renegar Glacier region, Southern Victoria Land, Abtarctica Subject The topic of the resource Metamorphic geology Hydrology fluids Koettlitz Group metamorphism https://theses.otagogeology.org.nz/files/original/d8d6bb2b9bc842ec24db773e8eadaf7a.pdf 068dc7f85fae349bf6d8880e5b701111 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 ((169.473788822000074 -43.741156775999968,169.46394852800006 -43.742060373999948,169.46208179100006 -43.742231688999937,169.461782132000053 -43.742259185999956,169.453683367000053 -43.74300203699994,169.449478543000055 -43.743387481999946,169.4375885500001 -43.750778774999958,169.423365096000111 -43.759616525999945,169.419581397000115 -43.759474324999985,169.393438840000044 -43.758488332999946,169.391643600000066 -43.758420398999931,169.391667898000037 -43.757303000999968,169.391832471000043 -43.749733127999946,169.392043207000029 -43.740036204999967,169.392191296000078 -43.733219433999977,169.392211363000115 -43.732295582999939,169.400038138000014 -43.726806331999967,169.410879505000025 -43.719200184999977,169.433831606000012 -43.703087320999941,169.439026468000066 -43.703272390999985,169.454009865000103 -43.703804834999971,169.46374765500002 -43.704149800999971,169.464010115000065 -43.704159086999937,169.466594452000095 -43.704250490999982,169.475845554000102 -43.704577198999971,169.496628288000124 -43.70530837299998,169.497210126000027 -43.705328787999974,169.497398148000116 -43.705204109999954,169.509653780000122 -43.697075518999952,169.512087561000044 -43.695460877999949,169.525273175000052 -43.695955431999948,169.526337046000094 -43.695995266999944,169.531341931000043 -43.696182531999966,169.530791194000017 -43.705683976999978,169.530648250000013 -43.708149397999932,169.530257049000056 -43.714895446999947,169.530121909000059 -43.717225457999973,169.529222518000097 -43.732727144999956,169.529028629000095 -43.736067777999949,169.523991925000018 -43.736532950999958,169.52290361300004 -43.736633432999952,169.514878997000096 -43.737373995999974,169.491618432000109 -43.73951728399993,169.473788822000074 -43.741156775999968)) Author last name Last name of the Author Simpson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Cooper, A.F. Norris, R.J. Abstract The Abstract for this thesis The 50 km2 area mapped, situated at Paringa, 50 km northwest of Haast, lies astride the Alpine Fault. Prior to c. ·15000 years B.P. the Alpine Fault bent across the Paringa River region. Increased thrusting on the bend led to the formation of an extensive nappe. More recently, the nappe has been abandoned to form a segmented structure made up of northerly striking thrust faults linked with more easterly striking, strike slip faults. The result is the formation of a complex compressional region (jog), characterised by anomalous uplift rates approaching 11 mm I year, in which the Quaternary sediments have been intensely deformed. Despite post-glacial sea level rise, the Paringa Formation records a local rapid marine regression in response to the development of the segmented structure. The presence of the first angular unconformity (attributed to differential uplift within the compressional jog) at about 12000 years B.P. suggests that the segmented fault system had developed at, or before this time. Following regression of the sea, a braided fluvial system soon became established. However, enhanced uplift in the compressional region about 9000 years B.P. led to damming of the Paringa River, and the subsequent flooding of forests by a lake. The flooding of forests occurred at least twice more before 3500 years B.P., when the present day fluvial regime became established. Haast Schist east of the Alpine Fault has been metamorphosed to the oligoclase zone of the amphibolite facies. The coexistence of albite and oligoclase within the mylonites is not thought to indicate retrograde metamorphism. Instead the peristerite feldspars are attributed to be part of a pod (of unknown extent) of upper garnet zone rock incorporated into the fault zone during the transition from dominantly transcurrent to oblique reverse motion on the Alpine Fault. There is, however, good evidence to suggest retrograde metamorphism has played an important role in dictating mineralogy within mylonites and cataclastic rocks close to the fault. The exponential increase in the phengite component of muscovite towards the Alpine Fault is thought to represent retrogression under lower temperature conditions. The presence of abundant epidote and actinolite (surrounding hornblende) within these rocks is also attributed to retrograde reequilibrium to greenschist facies conditions. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/2721">http://hdl.handle.net/10523/2721</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. Paringa River Westland Thesis description Number of pages, maps, CDs, etc. 168 leaves : ill. (some col.), maps ; 30 x 44 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 1992Simpson Creator An entity primarily responsible for making the resource Simpson, Guy D. H. (Guy Donald Hugh), 1970- Date A point or period of time associated with an event in the lifecycle of the resource 1992 Title A name given to the resource Quaternary evolution of the Alpine Fault Zone, and a mineralogical/microstructural study of the schist-mylonite transition, Paringa, south Westland Subject The topic of the resource Structural geology Mineralogy Quaternary geology Alpine Fault Zone Jamie Creek Paringa River schist-mylonite transition Westland