Show simple item record Brown, Jarrod A. en_US 2007-07-12T19:42:26Z 2007-07-12T19:42:26Z 2001-08-01T00:00:00Z en_US
dc.description.abstract The alkali feldspar paragenetic sequence in the Tanco pegmatite at Bernic Lake, Manitoba, spans the entire crystallization and cooling history of the pegmatite, and includes six different K(Rb)-feldspar and six different albite varieties. Total feldspar modal abundances approach 50% for the entire pegmatite volume. Blocky K-feldspar, aplitic albite and cleavelandite together account for more than 95% of total feldspar volumes. The other, late, low-temperature feldspars include (Rb,K) or (K) adularia and albite in veins and cavities, mostly contained in inner zones associated with pollucite and petalite. Feldspars collected from each of the nine major zones of the pegmatite have been assessed in terms of composition and structural state, along one east-west transect and two north-south transects. The large and economically significant Tanco pegmatite represents an extreme in terms of petrologic processes involving fractional and disequilibrium crystallization from granitic melts enriched in volatiles and fluxing components (H2O, B, F, P), rare-alkalis (Li, Rb, Cs) a d HFSE (Ta, Nb, Zr, Hf). (Abstract shortened by UMI.) en_US
dc.format.extent 12537196 bytes
dc.format.extent 184 bytes
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.language en en_US
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.title Mineralogy and geochemistry of alkali feldspars from the Tanco pegmatite, southeastern Manitoba en_US
dc.type info:eu-repo/semantics/masterThesis Geological Sciences en_US Master of Science (M.Sc.) en_US

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