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Sulphur and Lead Isotopic Studies of the Bottle Lake Massive Sulphide Deposits, Vancouver Island, B.C., Canada: Sources of the Ore Constituents in a Submarine Exhalative Environment.


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Author Seccombe PK, Godwin CI, Krouse RH and Juras ST


The Buttle Lake camp is in central Vancouver
Island, southwestern British Columbia, Canada. The
camp hosts world-class polymetallic volcanogenic
deposits of Devonian, Frasnian age (370Ma). This
paper describes an on-going sulphur and lead
isotope study of the major orebodies.
Sulphur isotopes were determined for
sulphides (pyrite, chalcopyrite, bornite and
galena) and sulphate (barite). Sulphide analyses
are markedly different from sulfate. The
differences are explained below in a unique model.
Sulphide isotopic compositions cluster
tightly (del34S -6.7 to 4.6), and demonstrate
isotope reversals. Calculated temperatures of
correctly ordered mineral pairs are unrealistically
high. We conclude that the sulphides are in
isotopic disequilibrium, presumably because of
rapid precipitation from a quenched plume in an
anoxic environment, and because of subsequent
sulphide replacement.