INTERPRETATION OF GALENA LEAD ISOTOPES FROM TEXADA ISLAND* (92F) By Colin
نویسندگان
چکیده
Texada Island (Figure 2-5-1) is with.in Wrangellia. Calcalkaline plutonism of the Coast plutonic complex is superimposed on this terrane. The northern part of the island is made up mainly ct basaltic amygdaloidal flows and pillovr lavas of the ?exad1 Formation (Karmutsen Fbrmation) overlain by massibe grqi limestone and white marble of the Marble Bay Fonnatio I (Quatsino Formation). These Upper Triassic formations hav: been intruded by diorite to quartz monzonite stocks and dike; of Jurassic age [Ettlinger and Ray, 1989; the Gillies stock, about 2 kilometres south of sample site 30565, Figure 2-5-1, has had zircons dated at Middle Jurassic (178-ltO M I years)]. Tertiary intrusions have not been identified. Geologicaldetailsoftl~eshowingsar~:inTable2-5-l.Mo~t of the showings examined here are associated with sulphiderich veins that commonly are gold and silver rich. Thes: sulphide-rich deposits generally contain traces of galena. which facilitated this study. Exploration is currently in progress on some of these precious metal occurrences.
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