Matthew Arges Honours Thesis Abstract

This pegmatite occurrence is part of the Georgia Lake Rare-Element Pegmatite Field of the Quetico Subprovince, NW Ontario, and is related to Stype, peraluminous Georgia Lake granites. The Georgia Lake pegmatite field is approximately 32 by 105 km wide, and is hosted entirely within the clastic metasedimentary rock of the Quetico Subprovince.  There have been 38 rare element occurrences discovered, including 10 spodumene-bearing occurrences, with approximately 11.7 million tons averaging 1.14% lithium oxide.  The 2670 +/- 2 Ma Glacier Lake Batholith extends greater than 100 km NE into the Quetico Subprovince, and has been interpreted to be the result of partial melting, creating the associated S-type granites of the Georgia Lake pegmatite field.

The Rock Tech Li pegmatite occurrence fits into the classification of albite-spodumene-type pegmatite. The associated dykes and veinlets are not heavily fractionated or diverse from the pegmatite body.  The aplite veins represent a fine- grained assemblage of the Rock Tech Li pegmatite with no exotic mineralogy.  The veins emplaced and expanded pre-existing fractures.