Platinum metals in the Stillwater Complex, Montana

Autor:	J. Haffty, J. J. Rowe, N. J. Page
Rok vydání:	1976
Předmět:	Peridotite Sperrylite Laurite Geochemistry Mineralogy Geology engineering.material Geophysics Geochemistry and Petrology Ultramafic rock Silicate minerals Magma engineering Economic Geology Mafic Braggite
Zdroj:	Economic Geology. 71:1352-1363
ISSN:	1554-0774 0361-0128
DOI:	10.2113/gsecongeo.71.7.1352
Popis:	Platinum-group metals show a wide variation in content and relative proportions in the rocks of the Basal, Ultramafic, Banded, and Upper zones of the stratiform mafic and ultramafic Stillwater Complex, southwestern Montana. Reported values range from the limits of determination to approximately 8 ppm Pt, 11 ppm Pd, 1.7 ppm Rh, 0.5 ppm Ir, 1.0 ppm Ru, and 0.1 ppm Au as analyzed by fire assay-spectrochemical and neutron activation techniques. The highest concentrations occur within particular horizons of the Basal zone; in the chromitites of the Peridotite member of the Ultramafic zone, in pegmatitic bronzitites in the Bronzitite member of the Ultramafic zone, in a specific horizon in the Banded zone, and in disseminated sulfide horizons in the Upper zone. These occurrences represent manifold enrichment over the estimated levels of about 12 ppb Pt, 55 ppb Pd, and
Databáze:	OpenAIRE
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