1 10 3 https://theses.otagogeology.org.nz/files/original/ac94b7f05ed75be6802c6bf1e55a90d8.pdf 9a501058931ed594f8aaa95a479458e9 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 ((170.474460337000096 -45.158292011999947,170.475614877000112 -45.131327066999972,170.521673805000091 -45.132454043999985,170.528281766000077 -45.141770805999954,170.572090444000082 -45.142681568999933,170.571336306000035 -45.160085164999941,170.570645875000082 -45.176009146999945,170.473788288000037 -45.173977990999958,170.474460337000096 -45.158292011999947)) Author last name Last name of the Author Rae 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 Siberia Hill is located approximately 35km southwest of Oamaru, in the Kakanui Ranges. The study area includes four Miocene volcanic centres, Siberia Hill, Mt. Dasher, Kattothyrst, and Camelback. All, with the exception of Siberia Hill, are plug remnants resting on schist basement. Siberia Hill consists of a series of flows, of varying rock types, that rest upon Tertiary sediments. Rock types in the area range from olivine nephelinite through basanites and olivine basalt to hawaiite, nepheline hawaiites and nepheline mugearite. Geochemical trends point to the importance of clinopyroxene and kaersutite fractionation in the early stages of crystallization. Plagioclase and titanomagnetite have an influence in the later stages of crystallization of the Mt. Dasher suite, and the Siberia Hill olivine basalt to hawaiite suite. Four types of clinopyroxene phases are recognized: 1) Groundmass titanaugites; 2) Titanaugite phenocrysts; 3) Titanaugite xenocrysts, derived from Group II (Frey & Prinz, 1978) xenoliths; 4) Alkali-rich acmitic augite xenocrysts that are thought to either represent wall rock debris or are products of the crystallization of evolved melts. The presence of nepheline and alkali feldspar xenocrysts, and the alkali-rich megacryst suite, suggests that crystallization of more evolved melts did occur at depth. Mantle derived inclusions are found in seven of the ten rock types. They include spinel lherzolites, clinopyroxenites and peridotites, megacrysts, and composite xenoliths. The clinopyroxenites and peridotites are typical of the Group II series xenoliths and represent dikes of alkali basaltic magma injected into the host peridotite. The cumulate textures and the euhedral habits of the megacrysts is consistent with crystallization from a magma at depth. Two composite xenoliths contain Group II lithologies in contact with Group I (Frey & Prinz, 1978) lherzolite. These represent pieces of the peridotite wall rock with intruding basaltic dike rock still intact. Geochemical studies reveal that the Group II lithology has undergone metasomatism and trends towards Group I compositions. The spinel lherzolites from the Otago region are interpreted to be fragments of the upper mantle peridotite. Equilibration temperatures ranging from 991°- 1206°C were obtained, using coexisting enstatite and diopside, and are consistent with an upper mantle source. Petrographically the lherzolites are very homogeneous, with a four pha~e assemblage of olivine, enstatite, Cr-diopside, and Cr-spinel. The exception is the presence of a pargasitic amphibole in a lherzolite from Kaitangata. This represents the product of a reaction between Crdiopside, spinel, and an infiltrating hydrous melt. It is concluded that the rock types of the Siberia Hill area are derived from partial melts of upper mantle peridotite. The most primitive ankaramitic basanites, nepheline basanites, and sanidine basanites have undergone the least amount of fractionation. The Siberia Hill nepheline hawaiite has undergone high pressure fractionation, evidenced by the presence of ubiquitous Group II inclusions and megacrysts. The presence of megacrysts and Group II. xenoliths in relatively primitive magmas suggests that the upper mantle and deep crust beneath the East Otago region consists of a series of complex intersecting dikes and magma chambers that are scoured and eroded by uprising magmas. These magmas are either fresh pulses of primary liquid or are differentiating magmas held in mantle or deep crustal regions prior to eruption. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Siberia Hill East Otago Thesis description Number of pages, maps, CDs, etc. x. 210 p. ill (some colour)., map folded in pocket., 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 1990Rae Creator An entity primarily responsible for making the resource Rae, AJ Date A point or period of time associated with an event in the lifecycle of the resource 1990 Title A name given to the resource Geochemistry of the Siberia Hill Volcanics and the Ultramafic Inclusions, Siberia Hill, East Otago, New Zealand Subject The topic of the resource Geochemistry east Kakanui Mountains Otago Region Siberia Hill Stranraer Group Waipiata Igneous Formation 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 Campbell Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Named locality Named locality describing the field area location. Waipiata Thesis description Number of pages, maps, CDs, etc. 81 p. : illus., col. map ; 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 1979Campbell Creator An entity primarily responsible for making the resource Campbell, Donald John Christianson, 1956- Date A point or period of time associated with an event in the lifecycle of the resource 1979 Title A name given to the resource Geology of the Waipiata district, Central Otago. Subject The topic of the resource Map Igneous petrology Metamorphic petrology Sedimentology gravel pumpellyite-actinolite Stranraer Group 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 MacPherson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? PGDipSci Advisers Who supervised/advised this student Read, P B Abstract The Abstract for this thesis Geological mapping conducted in an area surrounding Hyde, Central Otago, indicated that chlorite subzone schist underlay a succession of Tertiary rocks consisting of marine and freshwater sediments of the Stranraer Group, and alkali olivine basalts of the Waipiata Formation. The Haast schists consisted of massive and layered rock; the major mappable schist structure was a planar schistosity, and minor locally developed mesoscopic folding was observed. The Stranraer Group was subdivided into the Horse Burn and Hyde Formations, and the Hyde Formation was subdivided into the Fullarton and White Cliffs Members. Marine, glauconitic, sparsely fossiliferous, Bortonian (mid Eocene) age Horse Burn sands were deposited as a thin prism only in the north-east corner of the mapped area. During fresh-water Fullarton deposition gravels and sands poured into two localised, structurally controlled depocentres, and a thin sheet of Fullarton sediment was deposited across part of the remainder of the area. Fullarton sediments overlay Horse Burn sands in the Horse Burn type section. The White Cliffs depositional event was in part marine, at times hypersaline. White Cliffs sediments overlay Fullarton sediments in the west and south, and lay directly on schist in the centre of the examined area. A thin flow of Waipiata basalt overlay the Stranraer Group, and formed resistent caps on flat-topped hills near Hyde, and the extrusive centre, a large and structurally differentiated lava pond intruded by a sub-parallel dike swarm and numerous plugs, was exposed near Tiroiti. Correlation of Stranraer rocks with sections to the south and north-east indicated that in the Tertiary the Hyde area was situated near the shallow southern edge of a transgressive sea that passed inland to the north and west, and back to the present day coast, with only minor influence on the local depositional history. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/4588">http://hdl.handle.net/10523/4588</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. Hyde Otago Central Thesis description Number of pages, maps, CDs, etc. ix, 87 leaves : illus., fold. maps (in pockets) ; 28 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 1969MacPherson Creator An entity primarily responsible for making the resource MacPherson, JM Date A point or period of time associated with an event in the lifecycle of the resource 1969 Title A name given to the resource Geology of the Tertiary sediments surrounding Hyde, Otago. Subject The topic of the resource Map Cenozoic Igneous petrology Metamorphic geology Sedimentology Chlorite Zones Haast Schist Stranraer Group Waipiata Formation