Evolution and mineralization of the Moose II Lithium-Tantalum Pegmatite Deposit, Northwest Territories, Canada

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dc.contributor.advisorLentz, David
dc.contributor.advisorMcfarlane, Chris R.M.
dc.contributor.authorAnderson, Melissa O.
dc.date.accessioned2023-03-01T16:20:00Z
dc.date.available2023-03-01T16:20:00Z
dc.date.issued2013
dc.date.updated2020-04-22T00:00:00Z
dc.description.abstractThe Moose II rare-metal granitic pegmatite is located approximately 115 km east of Yellowknife, NWT, on the north shore of Great Slave Lake. The irregularly zoned dike is -430 m long by 61 m wide, and is discordantly hosted within polydeformed metaturbidites of the Neoarchean Yellowknife Supergroup. This deposit was mined for both lithium and tantalum (1946-1954). The pegmatite formed ca. 2652 Ma (U-Pb columbite ), which corresponds to a late magmatic period following a phase of extensive plutonism in the Slave Province. The size and orientation of the pegmatite suggest that it was emplaced into a dilatant zone along a north-trending shear zone. The dike displays extreme fractionation, manifested by the irregular spatial zonation of mineral assemblages, rare-metal enrichment, and the very high degree of chemical evolution. Mineralogical zones include: a narrow border zone, a fine-grained wall zone, several megacrystic intermediate zones, massive quartz and amblygonitemontebrasite core zones, saccharoidal ( aplitic) al bite zones, and muscovite-rich replacement zones. The degree of chemical evolution of the dike suggests that the pegmatite melt was injected a considerable distance from the progenitor pluton. Detailed internal fractionation trends show progressive evolution from the margins of the pegmatite inwards, and from the south section of the pegmatite towards the north. The economically important minerals present include: amblygonite-montebrasite (Li), spodumene (Li), and columbite-group minerals (Nb-Ta). Processes of niobiumtantalum mineralization are primarily magmatic, with enrichment during magmaticmetasomatism, and minor remobilization during hydrothermal metasomatism.
dc.description.copyright© Melissa Anderson (2013)
dc.description.noteElectronic Only.
dc.description.noteM.Sc. University of New Brunswick, Department of Earth Sciences, 2013.
dc.formattext/xml
dc.format.extentxxii, 335 pages : illustrations, maps
dc.format.mediumelectronic
dc.identifier.oclc(OCoLC)1151543419
dc.identifier.otherThesis 9130
dc.identifier.urihttps://unbscholar.lib.unb.ca/handle/1882/13540
dc.language.isoen_CA
dc.publisherUniversity of New Brunswick
dc.rightshttp://purl.org/coar/access_right/c_abf2
dc.subject.disciplineEarth Sciences
dc.subject.lcshLithium -- Northwest Territories.
dc.subject.lcshTantalum -- Northwest Territories.
dc.subject.lcshPegmatites -- Northwest Territories.
dc.titleEvolution and mineralization of the Moose II Lithium-Tantalum Pegmatite Deposit, Northwest Territories, Canada
dc.typemaster thesis
thesis.degree.disciplineEarth Sciences
thesis.degree.fullnameMasters of Science
thesis.degree.fullnameMaster of Science
thesis.degree.grantorUniversity of New Brunswick
thesis.degree.levelmasters
thesis.degree.nameM.Sc.

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