Source of Sulphur in cupriferrous iron sulphides in ophiolites
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Date
1974
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University of New Brunswick
Abstract
A cupriferous pyrite deposit in an ophiolite suite in Little Bay, Newfoundland exhibits δS-34(py) values of mean 12.43% and spread between 9.93% and 13.0%. This value lies almost midway between the zero permil value, traditionally indicative of mantle sulphur, and 26. 9%, the δS S-34 value for sea water sulphate of Ordovician age .
Considerations of ph, f0 2 and silicate and sulphides assemblages, delineates a physico-chemical environment of deposition, which when compared with δS-34(py)contours, suggests that the mantle is not the source of sulphur in the deposit. Sea water sulphate as a sulphur source seems favourable.