Table of Contents
Minerals, Volume 8, Issue 6 (June 2018)
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Cover Story (view full-size image) We deduced that the ophiolitic system was able to locally produce a high extent of Au-enrichment as [...] Read more. We deduced that the ophiolitic system was able to locally produce a high extent of Au-enrichment as a result of geochemical evolution and deposition from a fractionated Au–Cu-rich melt. This was likely due to high levels of incompatible Cu + Au associated with subordinate Pt during the bulk crystallization of Os–Ir–Ru alloy phases, after the preceding crystallization of chromian spinel and olivine. The Pt–Au–Cu alloys probably crystallized in the sequence from Au–(Cu)-bearing platinum to PtAu4Cu5. Whereas the alloy phases reflect a highly reducing environment, late assemblages indicate an oxygenated local environment leading to Fe-bearing Ru–Os oxide (zoned) and seleniferous accessory phases. View Paper here.