Samples of pyrite separates from massive sulphide layers vary stratigraphically in trace-element content, and show an enrichment of many of the elements in the centre of the layers. Trace-element contents of pyrite of massive sulphide deposits, of magnetite from a magnetite deposit, and of disseminated sulphides differ, presumably reflecting different origins. Trace-element contents of pyrite separates also differ among the sampled massive sulphide deposits. -G.J.N.
Additional publication details
Trace elements in disseminated sulfides, magnetite, and massive sulfides, West Shasta district, California.