1 10 1 https://theses.otagogeology.org.nz/files/original/d0a3a2042d28edca51a0aab8c3a8573d.pdf 92ff7f04e664b18fa767581e119e001b 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 (((170.564411096478 -45.5386272690959,170.559627119514 -45.5301419507655,170.559900945011 -45.5238127978249,170.568560274751 -45.5209967573922,170.573787365999 -45.5223463862715,170.579072506025 -45.5255070079308,170.579847091468 -45.5311439598299,170.571779808488 -45.5359263420047,170.564411096478 -45.5386272690959))) Author last name Last name of the Author Mawson Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Ohneiser, C. Abstract The Abstract for this thesis The Waipiata Volcanics comprise a monogenetic volcanic field in East Otago. A paleomagnetic study was conducted on Mt MacKenzie, a maar-diatreme volcano of this field, to determine the emplacement processes of a massive lapilli tuff and a basalt dike. Samples were collected from the basalt and closely spaced samples were collected in a transect through the tuff perpendicular to the dike. Paleomagnetic techniques used included anisotropy of magnetic susceptibility (AMS), thermal and alternating field demagnetisation, and hysteresis and isothermal remanent magrnetisation (IRM). AMS data indicate flow fabrics in the tuff orient steeply upwards out of the volcano; this is interpreted to have formed as a result of a debris jet up through the tuff. Thermal demagnetisation data reveal two magnetisation components, with an inflection point at 110-230°C. Alternating field (AF) demagnetisation data show the same components, with an inflection point at 3-20 mT. The two demagnetisation components are inferred to indicate that the intruding dike completely reset the magnetisation of the tuff and both were later overprinted by a viscous remanent magnetisation (VRM). Hysteresis data show saturation magnetisations of 8.89 × 10-2 Am2/kg to 2.60 × 10-1 Am2/kg, remanence magnetisations of 3.39 × 10-3 Am2/kg to 6.19 × 10-2 Am2/kg, and coercivities of 3.04 × 10-3 T to 1.91 × 10-2 T, consistent with mineralogy containing magnetite and maghemite. They display decreasing coercivity and concentration with distance from the dike, which could signify hydrothermal alteration processes while the dike was still hot. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. East Otago Thesis description Number of pages, maps, CDs, etc. 45 pages A4, A3 map in back pocket, Digital appendices 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 2016Mawson Creator An entity primarily responsible for making the resource Mawson, Jasmine Date A point or period of time associated with an event in the lifecycle of the resource 2016 Title A name given to the resource Paleomagnetism of the Waipiata Volcanics at Mt Mackenzie Subject The topic of the resource Paleomagnetics Volcanism AMS IRM VRM