Age of Mineralization and Post-Ore HydrothermaI Alteration at Copper Mountain, B.C.

Unaltered biotites from three samples of monzonite and gabbro from the Copper Mountain stock and a single sample from a pegmatic biotitechalcopyrite vein cutting the Triassic Wolf Creek formation have a mean K-A age of 193±7 m.y. These data support a suggestion based on geological evidence that Copper Mountain ore deposits are related genetically to the Copper Mountain stock. A cogenetic mineral pair (biotite and clinopyroxene) from a sample of sericitized and chloritized monzonite of the Copper Mountain stock have identical K-A ages of 150 m.y., which probably represents a time of widespread, post-ore, hydrothermal alteration. This alteration is believed to be related genetically to a group of postore intrusions known as the "mine dykes," suggesting that they also have an age of 150 m.y.
Keywords: Biotite, biotite, clinopyroxene, Copper Mountain, British Columbia, pegmatitic, University of British Columbia, copper, geology, mineral, minerals, Rock, Rocks
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