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Magmatic volatiles and platinum-group element mineralization in the Stillwater layered intrusion, U.S.A. by Amy P. Parker; Patricia L. Clay; Alan E. Boudreau; Ray Burgess; Brian O’Driscoll is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract The activity of volatile-rich fluids may be important in the evolution of basaltic magmatic systems and associated precious metal ore formation. There is evidence for Cl-rich fluids within the Stillwater Complex (Montana, U.S.A.), which have been linked to platinum and palladium mineralization in the economically important Johns-Manville (J-M) Reef ore body. We present the first data set for heavy halogens (Cl, Br, and I) and natural noble gas isotopes in bulk rock and mineral separates from the Peridotite Zone and the Olivine-Bearing Zone I of the Stillwater Complex, including samples from the J-M Reef and G Chromitite bodies. Our data reveal concentrations of 4 to 13 500 ppm for Cl, 26 ppb to 360 ppm for Br, and <1 ppb to 9 ppm I over the whole sample set. Cl, Br, and I correlate well with each other implying a shared process and/or distribution in mineral species. Br/Cl and I/Cl ratios span a range from 0.3 to 35 × 10−3 and 5 to 900 × 10−6 by weight, respectively, encompassing MORB-like to more enriched compositions, particularly for Br/Cl. High-Br/Cl ratios compared to MORB in some Stillwater samples suggest fractionation of halogens during the exsolution of a volat

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Author

Amy P. Parker; Patricia L. Clay; Alan E. Boudreau; Ray Burgess; Brian O’Driscoll

Publisher

Mineralogical Society of America

Published

2022

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)