Geochemical and petrological interpretation of mantle structure beneath the southwest Slave Province, NWT

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dc.contributor.authorCarbno, Gary Brent
dc.contributor.supervisorCanil, Dante
dc.date.accessioned2013-09-10T21:28:07Z
dc.date.available2013-09-10T21:28:07Z
dc.date.copyright2000en_US
dc.date.issued2013-09-10
dc.degree.departmentSchool of Earth and Ocean Sciences
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractThe Drybones Bay kimberlite has offered an opportunity to compare geophysical observations of the mantle lithosphere beneath the southwest Slave craton with geochemical and petrological interpretations through mantle xenoliths and xenocrysts. Coarse-textured garnet and spinel-garnet peridotite xenoliths, and garnet and garnetclinopyroxene xenocrysts were analyzed for a suite of trace elements. The Ni-in-garnet geothermometer (Canil, 1999) yielded equilibration temperatures between 850-1200 DC, and corresponding depths of 90-160 km, assuming a 41m Wm-2 paleogeotherm. This method estimates the thickness of the southwest Slave craton in the Ordovician at approximately 160 km, within the stability field of diamond. Trace element analysis revealed a distinct geochemical anomaly at a depth of approximately 120 km, which marks the transition from wehrlite to metasomatized wehrlite and lherzolite. This anomalous depth has been observed in geophysical studies, and has been interpreted as a structural discontinuity.en_US
dc.description.proquestcode0372en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/4924
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectmantle lithosphereen_US
dc.subjectxenolithsen_US
dc.subjectxenocrystsen_US
dc.subjectNorthwest Territoriesen_US
dc.titleGeochemical and petrological interpretation of mantle structure beneath the southwest Slave Province, NWTen_US
dc.typeThesisen_US

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