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Dissolution-reprecipitation vs solid-state diffusion in electrum: examples from metamorphod Au-bearing, volcanogenic massive sulfide (VMS)
deposits
いきものがかり>spend期刊名称： American Mineralogist
作者： Haiming Liu,Georges Beaudoinpos
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年份： 2021年
november关键词： Zoned electrum;dissolution and reprecipitation (CDR);solid-state
diffusion (SSD);Ming, Boliden;Au-bearing VMS
摘要：Native Au-Ag alloys (electrum) are the predominant precious metal host
in Au-bearing volcanogenic massive sulfide (VMS) deposits. The chemical composition and distribution of electrum records crystal growth and post-crystallization process. In this study, we prent detailed
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single girlstextural and compositional data of electrum from the Ming (Canada) and Boliden (Sweden) Au-bearing VMS deposits. Electron probe micro-analyzer (EPMA) and lar ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analys of electrum enable characterization of chemical zoning in heterogeneous electrum grains. Electrum from Ming exhibits Ag-rich cores, in gradational contact with an outer Au-rich transition zone also enriched in S, Fe, Cu, Zn, and Pb, which is in sharp contact with Ag-rich rims. The textural obrvations, coupled with in loneliness
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