https://theses.otagogeology.org.nz/files/original/1b0f15b4047e908b339cb20c2c085a22.pdf c6d7478eda35842b5ac76c2240d3de2c 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 ((167.878369194000015 -46.370050387999981,167.879808100000105 -46.353737961999968,167.879926584000032 -46.352390923999963,167.883119343000089 -46.316101634999939,167.93896656600009 -46.318647471999952,167.97454575200004 -46.320251739999946,168.019321430000105 -46.32225531499995,168.023377735000054 -46.322435170999938,168.051642607000076 -46.32368921799997,168.05150263400003 -46.325630246999935,168.050284278000049 -46.342731661999949,168.04613921300006 -46.40074345599993,167.909204655000053 -46.395211335999932,167.894838918000119 -46.394619168999952,167.876271165000048 -46.393852232999961,167.876658414000076 -46.389465469999948,167.878182414000094 -46.372187733999965,167.878369194000015 -46.370050387999981)) Author last name Last name of the Author MacFarlane Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Coombs, D.S. Landis, C.A. Abstract The Abstract for this thesis A sequence of spilitic pillow lavas, pillow breccias and tuffs, cut by numerous dikes, which crops out over the eastern part of the peninsula is defined as the Riverton Volcanics. An overlying, poorly exposed, group of lithologies is mapped as Undifferentiated Permian. These two lithologic groupings are infaulted against fossiliferous tuffaceous metasediments belonging to the Greenhills Group. Two phases of dike intrusion are recognised. The earlier dikes are spilitic, in some cases feeders to pillow lavas. They are crosscut by porphyritic basaltic dikes, which also cut the Undifferentiated Permian lithologies. There are no dikes within the Greenhills Group rocks. Field and petrographic evidence suggests that the Riverton Volcanics were emplaced in shallow water. Partial analyses reveal a very low K20 content (average 0.15%) which cannot be readily explained in terms of metasomatism. These rocks are tholeiites and may represent oceanic crust. The andesitic to basaltic tuffs of the Greenhills Group show calc-alkaline affinities. Double grading within these rocks is explained in terms of shallow submarine eruption. The area has been burial metamorphosed to prehnite-pumpellyite and pumpellyite-actinolite facies. In the west, the Greenhills Group tuffs have been contact metamorphosed by the emplacement of the Longwood Intrusives. Fossil evidence indicates an upper Lower Permian (Mangapirian-Braxtonian) age for the Greenhills Group. The underlying rocks are placed in the lowest Permian but may be older. The association of calc-alka1ine tuffs and tholeiitic volcanics is explained in terms of a plate tectonic model in which the Undifferentiated Permian rocks, in part, represent continent-derived sediments. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Riverton Peninsula Thesis description Number of pages, maps, CDs, etc. 92 leaves : illus., maps (fold.) 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 1973MacFarlane Creator An entity primarily responsible for making the resource Macfarlane, D. F., 1951- Date A point or period of time associated with an event in the lifecycle of the resource 1973 Title A name given to the resource Geology of the Riverton Peninsula, Western Southland Subject The topic of the resource Map Igneous petrology Metamorphic geology Structural geology Paleozoic Greenhills Group Permian Riverton Volcanics