1
10
46
-
http://theses.otagogeology.org.nz/files/original/4c608658f9e0ba677218e7e895515394.pdf
eeca980a0a10ab9e146e741388c45f2b
Dublin Core
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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
Anderson
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
BSc(Hons)
Advisers
Who supervised/advised this student
Landis, C.A.
Reay, A.
Abstract
The Abstract for this thesis
Beach and offshore sediments were systematically sampled and studied during this work.
Textural studies resulted in both on and offshore sediments being modelled by mixing of two modes, a fine modern modal population and a coarse relict modal population. The modern mode is analogous for beach and offshore sediments, the relict mode is finer in the beaches than offshore. This fining is due to abrasion and drowning of coarser clasts by the transgressing sea.
With the use of a microprobe, detrital grains were analysed and compared to analyses of minerals from inferred source areas.
Appraisal of all textural, mineralogical and chemical data results in definition of the nature of the sources of the Kakanui sediments.
Green hornblende and hypersthene are inferred to be derived from the rocks of the Waiau catchment or gabbroic bodies of southern New Zealand.
Epidote and MnO rich garnets are derived from the Haast Schist Group.
Brown hornblende, enstatite, spinel, clinopyroxene and pyrope garnet are derived from erosion of mantle derived material contained in the Kakanui Mineral Breccia or associated vents. A vent is concluded to occur approximately 4km offshore.
Two sources for glauconite were concluded. Sediment from the Waianakarua River and coastal erosion of the Gees Greensand at Gees Point.
Titanaugite are concluded as being derived from the Dunedin and associated alkalic volcanics of East Otago.
Department
The department where the student is studying primarily.
Geology
Named locality
Named locality describing the field area location.
Kakanui
Otago
north
Thesis description
Number of pages, maps, CDs, etc.
v. 180 p. ill. Photos. 30 cm.
Location WKT (WGS84)
The location stored in WKT (WGS84) format
POLYGON ((170.88 -45.17, 170.92 -45.17, 170.92 -45.21, 170.88 -45.21, 170.88 -45.17))
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Title
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Beach and Continental Shelf Recent Sedimentation of the Kakanui District, North Otago.
Identifier
An unambiguous reference to the resource within a given context
1982Anderson
Creator
An entity primarily responsible for making the resource
Anderson, SG
Date
A point or period of time associated with an event in the lifecycle of the resource
1982
Subject
The topic of the resource
Marine geology
Sedimentary petrology
Sedimentology
Mineralogy
beach sediment
shelf sediment
-
http://theses.otagogeology.org.nz/files/original/54a65a52b664092f4c864fbecf6bfeeb.pdf
f67735fe7d46f366e5d21931f4846aa3
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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
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Identifier
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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
-
http://theses.otagogeology.org.nz/files/original/1a0509208303822fa00b668d7bf684f4.pdf
5c7bbffdb0425897d1f488d111122e88
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Title
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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 ((169.276500153793449 -43.690520082890551,169.336629477284248 -43.662689521200043,169.349619439702849 -43.675730731370024,169.291658654649325 -43.705544230238083,169.276500153793449 -43.690520082890551))
Author last name
Last name of the Author
Phillips
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
BSc(Hons)
Advisers
Who supervised/advised this student
Reay, A.
Cooper, A.F.
Abstract
The Abstract for this thesis
A detailed study of a two kilometre coastal section from Tokakoriri Creek to Porphyry Point, South Westland, encompasses a strip of structurally deformed Cretaceous and Tertiary strata. The Cretaceous-Tertiary rocks include the Arnott Basalt (Mt-Dt), the Tokakoriri Formation and Porphyry Point Member (new) (DtDw), and the lower Abbey Limestone Formation (Dw-Dm). The Arnott Basalt erupted in a submarine environment, and comprises lava flows, hyaloclastite breccias, massive sheet flows, columnar flows, and isolated pillows in broken pillow breccias. Geochemical and mineralogical analyses reveal that the Arnott Basalt is mildly alkaline, and was erupted in a within plate tectonic setting. The strata directly overlying the Arnott Basalt are varied, comprising tuffs and conglomerates of polygenetic origin. While lapilli tuffs have basaltic to intermediate compositions, crystal tuffs and an ash deposit reflect active, explosive rhyolitic volcanism during the early Paleocene (Dt). The Porphyry Point Member (new) is proposed to include mass flow deposits intercalated with the Tokakoriri Formation. Petrological, mineralogical, and geochemical analyses show that the Porphyry Point Member (PPM) contains clasts of porphyritic trachyandesite, trachyte and rhyolite with alkaline affinities. Preliminary petrogenetic major element modelling suggests that volcanic clasts form two series: trachyandesite-trachyte C56-66 wt.%Si02) and trachyte-rhyolite (66-71.5 wt.%Si02). The PPM may be related to the Arnott Basalt through complex fractional crystallization, assimilation, or magma mixing processes. A new U-Pb date reveals that the Porphyry Point Member is 61.43 ± 0.76 Ma, placing an upper limit to the age of the underlying Arnott Basalt, and a lower age limit on deposition of Tertiary strata in the Tokakoriri Creek area. The Tokakoriri Formation is divided into 4 distinct lithofacies, based on field observations, previous micropaleontological work, and petrographic descriptions. This subdivision facilitates determination of younging direction in structurally complex areas, and helps to show that overturned strata are juxtaposed against right way up strata on the western limb of the Flaggy Antiform. Mapping and structural analyses recognize at least 2 phases of deformation: (1) sediment deformation including soft sediment, ductile fabric formation, and bedding parallel faulting and (2) oblique and dip-slip normal faulting. Overall, the Tokakoriri Creek coastal section reflects a complex structural history involving sediment deformation of unlithified or weakly lithified sediments overprinted by tectonic faulting and folding episodes.
Department
The department where the student is studying primarily.
Geology
Named locality
Named locality describing the field area location.
Westland
south
Tokokoriri Creek
Thesis description
Number of pages, maps, CDs, etc.
xiii, 291 leaves : ill. (some col.), maps (some col., some folded) ; 30 cm.
Dublin Core
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Identifier
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2001Phillips
Creator
An entity primarily responsible for making the resource
Phillips, Carolyn J. (Carolyn Jeanne)
Date
A point or period of time associated with an event in the lifecycle of the resource
2001
Title
A name given to the resource
Geochemistry, geochronology, and petrology of the Arnott basalt and Tokakoriri formation, Tokakoriri Creek, South Westland
Subject
The topic of the resource
Geochemistry
Petrology
Geochronology:Arnott basalt
Tokakoriri formation
-
http://theses.otagogeology.org.nz/files/original/75b5f961d259e77ab56d70cfa3fb8830.pdf
0807399922b65521b24443691f74fdcb
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Title
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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 (((170.609321054418956 -45.455228026503654,170.611023917892567 -45.452763714561065,170.716139093469394 -45.531125784359006,170.609321054418956 -45.455228026503654)),((170.321698845852012 -45.867905864741019,170.169807260542541 -46.14620484708496,169.747845574527219 -46.19021751020783,169.904071956453322 -45.874492024406827,169.881739752211161 -44.930247273080035,170.609321054418956 -45.455228026503654,170.321698845852012 -45.867905864741019)))
Author last name
Last name of the Author
Németh
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
PhD
Advisers
Who supervised/advised this student
White, J.D.L.
Reay, A.
Abstract
The Abstract for this thesis
The Miocene Waipiata Volcanic Field (WVF), New Zealand, is an eroded phreatomagmatic volcanic field. Three different types of vent or vent complex were recognized. Vent-filling deposits comprising predominantly lava, preserved in the form of plugs, necks, lava lake remnants, lava flows, or dykes, were classified as Type 1 vents. Type 1 vents are inferred to be the remnants of scoria cones, most of them with thin basal phreatomagmatic pyroclastic deposits. Vents represented by predominantly pyroclastic infill are classified as Type 2 vents. Type 2 vents are inferred to have been the substructures of phreatomagmatic tuff ring/maar volcanoes, many of which may have had associated scoria cones. Type 3 vent complexes are groups of closely spaced or overlapping vents, with voluminous preserved lava flows. Type 3 vent complexes are the remnants nested maars and tuff rings with associated magmatic explosive and effusive products. Pyroclastic rocks of most of the Waipiata vents record initial phreatomagmatic explosive activity fuelled by groundwater followed by Strombolian-style eruptions.
Erosion rates for the WVF are 5 to 50 m per million years. Cenozoic sedimentary cover was widespread and still complete ( e.g. 200 – 400 m thick Oligocene marine units) at the time of volcanism, although over much of the field no Cenozoic sedimentary rock units remain today .
Vent alignments largely follow the basement structural pattern of the Otago Schist, defining NESW and NW-SE trends. The longest vent alignment, traceable in ~ 30 km, coincides with and is parallel to the largest fault zone in the Otago region, the NW-SE trending Waihemo- fault zone.
The total volume of magma erupted in the WVF is estimated to have been ~ 9 to 40 km^3 DRE. A systematic compositional sequence exists at each volcano, with initial phreatomagmatic eruptive products being differentiated tephrite and phonotephrite composition, whereas subsequent lava flows and dykes are of primarily basanite. Basanite was parental to the tephrite and phonotephrite. Basanite generated beneath WVF appears to have “failed” to reach the surface, instead being captured en route and stored to produce tephrite phonotephrite via 15-25 % crystal fractionation of olivine and clinopyroxene. Many attempted eruptions of parental basanite "failed", and that each successful eruption at the surface involved both a newly-injected basanite from depth, and a transected and entrained remnant of melt evolved from magma captured at shallower depths from a preceding "failed" eruption. Significant amount of magma was underplated beneath or injected into the crust of the WVF. The Otago crust is density and rheologically stratified, and in the Miocene lay within a mild extensional (strike- slip) tectonic regime; this combination was responsible for the entrapment of magma at various levels in the Waipiata – Dunedin region.
The WVF-wide trend in magma evolution at individual vents has also been demonstrated from the mild extension-related Late Miocene Bakony- Balaton Highland Volcanic Field (BBHVF), Hungary. Recognition of this pattern at two unrelated fields may suggest that initial injection, with subsequent entrainment to produce dual-source monogenetic eruptions may be common in intracontinental alkaline basaltic volcanic fields. It is suggested that the lithospheric density and rheological structure, together with the state of stress, play an important role in fostering magma injection and entrapment in areas where the crust is 1) strongly density stratified, 2) relatively thin, 3) hot (high heat flow), and 4) the crustal stress regime mildly extensional, preferably with strike slip movements. These conditions were shared by the WVF and the BBHVF, with the result that magmas, processes of storage and differentiation, and ultimate eruption and volcano formation were in many ways remarkably similar.
Department
The department where the student is studying primarily.
Geology
Named locality
Named locality describing the field area location.
Waipiata
Otago
north
Thesis description
Number of pages, maps, CDs, etc.
2 v. : ill. (some col.), maps (1 folded, col.) ; 30 cm. + 1 computer disk.
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
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2001Nemeth
Creator
An entity primarily responsible for making the resource
Németh, Károly, 1969-
Date
A point or period of time associated with an event in the lifecycle of the resource
2001
Title
A name given to the resource
Phreatomagmatic volcanism at the Waipiata volcanic field, Otago, New Zealand
Subject
The topic of the resource
Volcanology
Igneous geology
Structural geology
Map
basanite
erosion
Hungary
maar
New Zealand
phreatomagmatic
scoria
tephrite
vent
-
http://theses.otagogeology.org.nz/files/original/14d071dddb26af7295b49c7c9f472cdb.pdf
1dd106a5aa5a5f07ab84b70c193b35fc
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
Garden
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
BSc(Hons)
Advisers
Who supervised/advised this student
Reay, A.
Abstract
The Abstract for this thesis
Two garnet bearing tuffs are known in North Otago, Kakanui and Alma. The Kakanui Mineral Breccia contain a diverse range of upper mantle derived megacrysts and xenoliths while the Alma contains a limited assemblage of megacrysts and xenoliths. Within the Kakanui Mineral Breccia, three magmas were identified through a detailed EMP and LAM study of the megacryst and garnet pyroxenite suite. Crystallisation pressures for the megacrysts f'ere determined by near liquidus experiments using the nephelinite host composition for the starting material, and geothermometry and geobarometry for the garnet pyroxenite suite (Zack et al (1997). Megacryst crystallisation occurred between 25-15kb and 1200-1150°C with the bulk occurring between 22-17kb. The garnet pyroxenites crystallised between 15-16kb and 930°C. The Kakanui Mineral Breccia underwent a complex petrogenesis involving three different magmas, the nephelinite host (parent to megacrysts suite}, an evolved nephelinite (parent to garnet pyroxenite suite) and an Alkali Olivine Basalt (triggering magma by magma injection). The magma ascent was initiated by the injection of Alkali Olivine Basalt into the megacryst bearing nephelinite. This AOB interacted j with the nephelinite host (mixing causing heterogeneity) and possibly added xenocrysts of higher magnesium garnet compared to the megacryst suite garnet ofthe nephelinite. The nephelinite host intersected a solid garnet pyroxenite pod trapped within lherzolite formed from an evolved nephelinite parent, which reacted with the ; volatile rich host to form metasomatic kaersutite. The origin of the plagioclase bearing garnet pyroxenite is potentially resolved as al'\ j \ extremely evolved garnet pyroxenite (late stage crystallisation). A new megacryst phase from the Kakanui Mineral Breccia is confirmed, zircon, the chemistry is unique to other zircons in the South Island, Hf!Zr ratio suggests crystallisation from a nephelimte or an undersaturated rock. A similar Mineral Breccia at Alrna, is derived from a more evolved magma sourced deeper in the Mantle with unknown relationship to Kakanui.
Department
The department where the student is studying primarily.
Geology
Named locality
Named locality describing the field area location.
Kakanui Mineral Breccia
Thesis description
Number of pages, maps, CDs, etc.
ix. 165 p, diagms, 30 cm, +CD-Rom (4 3/4 in.)
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
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2001Garden
Creator
An entity primarily responsible for making the resource
Garden, Benjamin P
Date
A point or period of time associated with an event in the lifecycle of the resource
2001
Title
A name given to the resource
The Kakanui Mineral Breccia: Experimental and mineral geochemistry
Subject
The topic of the resource
Geochemistry
geochemistry
Kakanui Mineral Breccia
megacrysts
xenoliths
-
http://theses.otagogeology.org.nz/files/original/fabc83db9a41e1803971a16d7c5608d5.pdf
e7f3c2db060b995dcb81f565c346fd77
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
Baines
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
PGDipSci
Advisers
Who supervised/advised this student
Reay, A.
Abstract
The Abstract for this thesis
Recently there has been an increase in i:Qterest in zeolite minerals, mainly through commercial mining operations in the North Island and the research carried out by NIW A reporting on the potential of these deposits. Zeolites made a name in New fealand with the classical description of zeolite facies metamorphism (Coombs, 1951) based on the Taringatura Hills, in Southland. · Zeolite localities are numerous in New Zealand mainly in basic volcanic rocks and some outstanding specimens have been found and recorded. Specimens from some South Island localities have been collected and are described. Because of their small size, unless some means of magnification is provided, the specimens are not fully appreciated. Zeolites have been collected and examined by Optical techniques, Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Electron Probe Microanalyzer and X-ray Fluorescence (XRF) to determine their identity, morphology, and chemical composition. The chemistry of natural zeolites is complex; the capability of the zeolite to exchange cations and water at very low temperatures makes it difficult to the determine their composition. Electron microprobe analysis is made difficult with the ease that water is "boiled off' by th~ electron beam. Element mapping has provided an aid, and illustrates the chemical distribution of sodium and calcium cations in the crystal structure. The Scanning Electron Microscopy has been valuable in illustrating the process of twinning and epitaxal growth relations between different zeolites. A X-ray Diffraction database of New Zealand zeolites is being compiled for reference. The two commercial operations in the North Island have been visited to determine the geological environment in which these zeolites formed and to analyse the samples from these deposits. The work is ongoing. With the extent of Tertiary basaltic rocks and geothermal deposits in·the North Island provides great opportunities to find new deposits and hopefully more new zeolite specimens. ~
Department
The department where the student is studying primarily.
Geology
Named locality
Named locality describing the field area location.
New Zealand
Thesis description
Number of pages, maps, CDs, etc.
vi, 77 leaves : ill. (some col.), maps ; 30 cm.
Dublin Core
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Identifier
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2001Baines
Creator
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Baines, Alun (Alun Bernard)
Date
A point or period of time associated with an event in the lifecycle of the resource
2001
Title
A name given to the resource
Natural zeolites of New Zealand : occurrence, properties, use
Subject
The topic of the resource
Geochemistry
petrology
zeolites
-
http://theses.otagogeology.org.nz/files/original/0d83cf9cbbf3d0c84fc2ed953f06cf99.pdf
c513051d6cd55ff4c376eae193058661
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
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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 ((167.684560242620393 -46.314211846419092,167.699273705839744 -46.314896841453731,167.699404822204968 -46.324191522481442,167.741023257258831 -46.32754768104369,167.739450449649496 -46.347481240721294,167.682272788767506 -46.344828997526719,167.684560242620393 -46.314211846419092))
Author last name
Last name of the Author
Wadsworth
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
MSc
Advisers
Who supervised/advised this student
Reay, A.
Abstract
The Abstract for this thesis
A suite of calc-alkaline to tholeiitic plutonic rocks exposed along a five kilometre stretch of coastline on the south .coast of the South Island, New Zealand, form the coastal section of the Longwood Complex. On the basis of field relations, geochemistry and mineralogy, the Pahia Inirusives can be differentiated into two gabbroic suites, here termed the Hill H Gabbro (HHG) and the Pahia Point Gabbro (PPG). In between the gabbroic units is a quartz-diorite unit termed the Boat Harbour Diorite (BHD). Two phases of hornblende microdiorite mafic dikes intrude the main rock units, with the first phase defined as comprising< 68 ppm Zr, and the second phase> 82 ppm Zr. At Pahia Point a zone approximately 250 metres wide is recognised as the result of coexisting, yet contrasting magmas, in the form of the PPG and the BHD, interacting to produce a mingled (and possible mixed) zone. Field relationships and geochronology indicates near-coeval magmatism for these two rock-types. The contact zone between the gabbro and the diorite (termed the MZG) is characterised by an abundance of acid-net veining, and multiple dike intrusions in the form of hornblende microdiorite and mingled composite dikes. Plagioclase is often the only primary mineral remaining, and records a complex evolution of remelting, and re-crystallisation in disequilibrium conditions. Previously the MZG has been interpreted as a hybrid zone (Price and Sinton, 1978) comprising rocks with gradational textures and mineralogy between the gabbro and diorite (Bignall, 1987). However field relationships, petrography, mineralogy, and geochemistry interpretations made during this study suggest that significant mixing has not taken place. The contact proper can be defined as a two to three metre wide zone coarsely feldspathic in nature, and characterised by ragged plagioclase cores, overprinted by secondary plagioclase crystallisation, and an abundance of amphibole. Composite dikes are composed of mafic enclaves enclosed within a relatively more felsic host. Enclaves are elongate and boudinaged parallel to the margins of the dike, indicating the mafic 'globules' were mobile within the felsic host. Two phases of composite dikes can be interpreted on the basis of colour and orientations observed in the field, and geochemistry. Typically more evolved composite dikes with lighter coloured hosts intrude the BHD, whilst relatively more primitive composite dikes intrude the MZG with hosts less discernible from the gabbroic rocks. Analyses of the composite dikes and the MZG reveal a complicated evolution involving magma mingling (and possible mixing), perhaps associated with fractional crystallisation.
Department
The department where the student is studying primarily.
Geology
Named locality
Named locality describing the field area location.
Pahia Point (Southland)
Thesis description
Number of pages, maps, CDs, etc.
viii, 186 leaves : ill. (some col.), maps (1 col., 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
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2000Wadsworth
Creator
An entity primarily responsible for making the resource
Wadsworth, Craig Allan, 1975-
Date
A point or period of time associated with an event in the lifecycle of the resource
2000
Title
A name given to the resource
Petrochemistry of a gabbro-diorite contact, Pahia Point, Southland
Subject
The topic of the resource
Geochemistry
Igneous petrology
contact zone
diorite
gabbro
petrochemistry
-
http://theses.otagogeology.org.nz/files/original/2d7e2e254b1187ad319b1c5e5ac4518c.pdf
959a4898301884eedb256eab673118d8
Dublin Core
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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
Thomas
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
MSc
Advisers
Who supervised/advised this student
Landis, C.A.
Reay, A.
Abstract
The Abstract for this thesis
The Holocene stratigraphy of the Blueskin Bay estuary was investigated using percussion cores. The Blueskin Bay estuary Holocene sequence comprises eight lithofacies arranged into a central estuarine basin consisting of an exposed intertidal flat, a sheltered intertidal flat and two estuarine bay head deltas. The exposed and sheltered intertidal flats are occupied by marine-influenced to paralic sand accumulations consisting of transgressive to highstand open-bay/estuarine deposits. The estuarine bay head deltas are dominated by tidalfluvial highstand point-bar and channel-lag deposits. Radiocarbon ages from in-situ and reworked shell and organics are used to establish the chronology of the Holocene stratigraphy. Holocene marine deposition commenced during the post-glacial transgression (ea. 9-7ka) and was dominated by an open-bay depositional environment in the position of the present central estuarine basin. At the time of the maximum transgression (ea. 6.2 ka) the majority of the Holocene estuarine sediment was in place. Hightsand deposition has been characterised by a period of erosion within the central estuarine basin and the episodic accretion and progradation of the estuarine bay-head deltas and around the bay margins. A database of 18 radiocarbon dates from estuarine sediments of the Blueskin Bay estuary, of which 8 are unpublished, is presented in this study. The elevation data have been reduced to a common datum (Mean Sea Level, MSL) and the sources of error assessed. Using modern lithological and biological relationships relative to present sea-level, radiocarbon dates can be converted into paleosea-level indicators. The upper and lower limits of the paleosea-level dataset provide an envelope representing local relative sea-levels. The envelope is consistent with a culmination of the post-glacial transgression after 6.5 ka BP, followed by a minor regression of -1.4 m from 5.5-5 ka BP, followed by a minor transgression of+ 1.4 m between 5-3.2 ka BP. Twelve radiocarbon dates from estuarine sediments of the Papanui and Hoopers Inlets located on the Otago Peninsula, corrected to a common datum (MSL), are used to constrain a relative sea-level curve and provide a proxy for the relative sea-level curve of the Blueskin Bay estuary. The paleosea-level dataset for the Papanui and Hoopers Inlets indicates a stillstand of +0.2m occurred at ~6 ka BP, followed by a minor regression of -0.7 m between 6 and 3.8 ka BP, followed by a minor transgression of +0.5 m from 3.8 to 3 ka BP. As with the newly proposed Blueskin Bay estuary relative sea-level curve, the last 3 ka BP of the sea-level curve for the Papanui and Hoopers Inlets has been stable. Newly proposed relative and eustatic sea level curves for the Blueskin Bay estuary, Papanui and Hoopers Inlets provide additional reference localities for New Zealand Holocene regional sea-level studies. All available data from the Holocene sediments infilling the estuary of Blueskin Bay and the Papanui and Hoopers Inlets suggest there has been no tectonic uplift or subsidence of the East Otago coast or Otago Peninsula during the mid to late Holocene. The large core and radiocarbon database from the Blueskin Bay estuary allowed an analysis and interpretation of the systems tracts and parasequences developed during the late Holocene. Within this interpreted sequence stratigraphy, the transgressive systems tract (TST) corresponds to the sequence boundary between the basal Holocene/Pliestocene superimposed by a ravinement surface and/or marine erosion surface (MES-1 ). The maximum flooding horizon (MFH), peak eustatic sea-level horizon (PESH), and/or peak relative sea-level horizon (PRSH), defined as isochrons equivalent to the maximum transgression of the shoreline and peak eustatic or relative sea level [within a cycle] respectively (after Larcombe & Carter, 1998), are not necessarily marked by a physical surface/sedimentary boundary within the Blueskin Bay estuary. The majority of the Holocene sediments deposited within the Blueskin Bay estuary correspond to the highstand systems tract (HST) of the post-glacial sea-level cycle. A geochemical study of the Blueskin Bay estuary sediments reveals distinct provenance signatures and some evidence for trace metal contamination proximal to possible pollution point sources.
OURArchive handle
The handle from the Otago University Research Archive (OURArchive)
<a href="http://hdl.handle.net/10523/3245">http://hdl.handle.net/10523/3245</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.
Blueskin Bay (East Otago)
Thesis description
Number of pages, maps, CDs, etc.
2 v. : 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
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2000Thomas
Creator
An entity primarily responsible for making the resource
Thomas, David Gregory, 1975-
Date
A point or period of time associated with an event in the lifecycle of the resource
2000
Title
A name given to the resource
Holocene stratigraphy and sequence architecture of the Blueskin Bay estuary, East Otago
Subject
The topic of the resource
Quaternary Geology
Marine Geology
Sedimentology
Blueskin Bay Estuary
Holocene
sequence stratigraphy
-
http://theses.otagogeology.org.nz/files/original/63ddddce076718516b774eb5f6ce9886.pdf
f553d912be6bd20caf2e310339914d2d
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 ((170.564623122649181 -45.870605305241725,170.738538829663781 -45.768444162106924,170.826525841809001 -45.833499856599623,170.649188454152068 -45.934771243664549,170.564623122649181 -45.870605305241725))
Author last name
Last name of the Author
Martin
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
PhD
Advisers
Who supervised/advised this student
White, J.D.L.
Reay, A.
Abstract
The Abstract for this thesis
The Otago Peninsula is part of the Dunedin Volcanic Complex and the Dunedin Volcanic Group, of Miocene age. Tephra and a suite of alkali basalt magma began erupting in the Sandfly Bay area. The Dunedin Volcanic Complex built up on a continental shelf. Activity commenced with the occasional eruption of basaltic tephra and lava. The earliest pyroclastic deposits are accompanied by peperites that formed due to interaction of magma with unconsolidated marine sands. These peperites together with pillow lavas, hyaloclastite and turbidites are evidence of subaqueous activity. Activity from various small vents over several million years has resulted in a complex stratigraphy and produced a wide range of pyroclastic deposits, including tephra from submarine, emergent, and fully subaerial vents. Most of the small volcanoes on the Otago Peninsula seem to represent small short-lived eruption sites but locally there are also eruptive centres that were active for quite a substantial time or were reactivated. A new volcanological map of the Otago Peninsula shows the distribution of these tephra deposits and the eruption sites. Rocks of the Dunedin Volcanic Complex rest on Cretaceous and Tertiary sedimentary rocks, which are underlain by pre-Cretaceous basement of quartzofeldspathic schist (Haast Schist Group). The sedimentary rocks comprise marine sandstones, mudstones and limestones, which were deposited on the continental shelf, and a non-marine-marine basal unit (see chap. 1 & 2). A loosely constrained stratigraphy is based on relationships of volcanic rocks to these marine sedimentary rocks, over- and underlying unit contacts, and correlation with the best available global sealevel curve. Documentation and age dating of features, such as correlative conformities, in seismic, well-log, and outcrop data, in marine outcrops in different parts of the world have led to a new generation of Cenozoic sea level cycle charts with greater event resolution than that obtainable from seismic data alone. This sea level curve has been used together with other available data (analyses of bedding in tephra, fossil content, pillow lavas as indicator for subaqueous environment) to support interpretations of depositional environments, and to infer ages of the deposits by correlation to the sea level curve. Such a correlatin assumes that there has been no or only little uplift or subsidence of the Dunedin Volcanic Complex. The history of the Otago Peninsula includes six stages of volcanic activity, of which four took place in a subaqueous to emergent environment. This result indicates that subaqueous volcanic activity took place over quite a long period of time during the early history of the Dunedin Volcanic Complex. The tephra ranges in composition from basanite and basalt, to phonolite and trachyte, typical for intraplate volcanism. Microprobe glass analyses and whole rock XRF analyses indicate a process of fractionation crystallisation with fractionation trends resulting from processes operating on mantle derived magmas at various levels in the crust.
Department
The department where the student is studying primarily.
Geology
Named locality
Named locality describing the field area location.
Otago Peninsula
Thesis description
Number of pages, maps, CDs, etc.
1 v. (various pagings) : ill. (some col.), maps (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
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2000Martin
Creator
An entity primarily responsible for making the resource
Martin, Ulrike, 1960-
Date
A point or period of time associated with an event in the lifecycle of the resource
2000
Title
A name given to the resource
Eruptions and deposition of volcaniclastic rocks in the Dunedin volcanic complex, Otago Peninsula, New Zealand
Subject
The topic of the resource
Volcanology
Ignoues Petrology
Dunedin Volcanic Complex
eruptions
volcaniclastics
-
http://theses.otagogeology.org.nz/files/original/68a4a158205e6c698e073dcdca78f192.pdf
6ee39ec7d9de04ed3f6ddea01d256444
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
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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 ((170.814626820891903 -45.394145807811576,170.814783303516492 -45.405866369096657,170.790638807307147 -45.405973267087838,170.780398843554053 -45.392913894643613,170.781086362911168 -45.375350863375189,170.814542877099228 -45.375281734170912,170.814626820891903 -45.394145807811576))
Author last name
Last name of the Author
Hill
Project type
Is it an MSc, PhD, BSc(Hons) or PGDipSci?
BSc(Hons)
Advisers
Who supervised/advised this student
Reay, A.
Abstract
The Abstract for this thesis
Introduction There is a curious geological pattern pointing to the fact that silicic volcanism was active during the Late Cretaceous in the South Island of New Zealand. Small localised 110 - 100 M a ago silicic volcanic deposits are found outcropping in Nelson-North Westland, in the Naseby district of North Otago and in the Shag Valley district of NE Otago. This study investigates the Otago silicic volcanic rocks with the purpose of seeing how they compare with each other. Emphasis has also been placed on clarifying the field relations and documenting the lithology of the Shag Valley volcaniclas'1c sediment. 1.1 Geological Setting In both North and East Otago small amounts of Cretaceous silicic tuff are found intercalated within r r the Kyebum and Horse Range formations respectively. These formations consist of thick sequences of breccias and conglomerates which have accumulated in fault depressions that formed under an extensional regime during the Mid to Late Cretaceous. Lower Cretaceous to Early Tertiary marine deposits overWthe Horse Range Formation in East Otago. In North Otago marine transgression reached up into the Maniototo but not as far as the Naseby field locality. A shift to a compressional regime, which has affected the South Island since the early Tertiary, has reactivated Cretaceous normal faults in the reverse sense, producing uplift of basement rocks and the overlying sequences along the NW/SE trending Waihemo Fault Zone (WFZ). The Horse, Kakanui and Ida ranges were formed and these now act as the northern border of the Shag Valley 1 and the M~miototo plains. The NW/SE trending faults mark a change in the Haast schist basement geology where low grade TZ I-ll schists have been uplifted on the northern side above higher grade TZ Ill-IV schist. Figure 1 is a locality map, this shows the location of the two field localities and their relation to the Cretaceous sediments and major faults. The Shag Valley Locality Note that grid references (GR) referring to the Shag Valley locality are from Sheet 143 (NZMS, 1980). The field area is five minutes drive north of Palmerston. It lies within farmland at the foot of the QC Horse Range on the northern side of the lower Shag Valley. A ~trip 1.5 km wide and 2.5 km long, trending NW has been mapped. Nineteen days were spent in the field, the majority of which were spent at two localities. 1.2.1 The Geology On the northern margin of the Shag Valley schists of grade no higher than TZ 11 have been pushed up along faults of the WFZ, forming the Horse Range. Cretaceous sediments of the Horse Range Formation lie north of the WFZ within the Horse Range. These sediments have been uplifted above Horse Range Formation to the south. The latter sediments lie within a fault bounded strip trending NW -SE. These in turn have been uplifted, juxtaposing Cretaceous sediments against Late Tertiary marine sediments. The silicic volcanics outcrop only in this fault bounded strip. As you move outside the field area, within the infaulted strip towards the coast, you move up through the local Tertiary marine sequence. 2 In the first chapter the stratigraphy and structure is briefly presented. It should be noted that lab and field work has not been focussed on these surrounding rocks.
Department
The department where the student is studying primarily.
Geology
Named locality
Named locality describing the field area location.
Shag Valley
Naseby
Thesis description
Number of pages, maps, CDs, etc.
60 leaves : ill. (some col.), maps (some col.) ; 30 cm.
Dublin Core
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Identifier
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1999Hill
Creator
An entity primarily responsible for making the resource
Hill, Matthew Galloway.
Date
A point or period of time associated with an event in the lifecycle of the resource
1999
Title
A name given to the resource
Cretaceous silicic volcanic deposits in the Shag Valley and at Naseby
Subject
The topic of the resource
Volcanology
Geochemistry
ignimbrite
Mineralogy
Shag Valley