Abstract
Evidence of immiscibility between arsenide and sulfide melts has been observed both in experimental studies and natural samples from several localities worldwide (e.g., Ronda, Spain; Beni Bousera, Morocco; Dundonald Beach South, Canada). Platinum-group elements (PGE) have shown to have a strong affinity for arsenide melts, but little is known about their partitioning behavior between arsenide and sulfide melts. In this study, we experimentally determine the partition coefficients of PGE (Pt, Pd, Ir, Ru, and Os) between both types of melt in As-saturated sulfide systems doped with trace amounts of PGE. Results show that all PGE display a strong preference to the arsenide melt with
Acknowledgments and Funding
We thank A. Larios (ICTS National Centre for Electron Microscopy, Complutense University of Madrid) for his assistance with the electron microprobe analyses and photomicrographs. We very much appreciate the comments from the reviewers J. Brenan and Y. Li, and Associate Editor K. Kiseeva, who significantly improved the manuscript. This research was supported by Spanish project RTI2018-099157-A-100. R. Fonseca is grateful to the Deutsche Forchungsgemeinschaft for funding of a Heisenberg Professorship (via grant FO 698).
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