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Enrichment of precious metals associated with chalcopyrite inclusions in sphalerite and pyrite
American Mineralogist ( IF 3.1 ) Pub Date : 2024-01-02 , DOI: 10.2138/am-2022-8636 He Zhang 1, 2 , Gujie Qian 2 , Fengfang Zhou 3 , Yuanfeng Cai 1 , Allan Pring 2, 4
American Mineralogist ( IF 3.1 ) Pub Date : 2024-01-02 , DOI: 10.2138/am-2022-8636 He Zhang 1, 2 , Gujie Qian 2 , Fengfang Zhou 3 , Yuanfeng Cai 1 , Allan Pring 2, 4
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The results of investigations into enrichment of precious metals in sphalerite and pyrite from the Maluntou epithermal gold deposit, China, are reported. The obtained data suggest intimate associations of Au- and Ag-bearing nanoparticles with chalcopyrite inclusions in sphalerite and pyrite. The origins of chalcopyrite inclusions involved different hydrothermal processes, including recrystallization-driven phase separation from parent chalcopyrite-sphalerite solid solutions and replacement of pre-existing pyrite in the presence of Cu-bearing fluids. The chalcopyrite blebs/lamellae follow sphalerite {111} planes, which define a shared sulfur layer for both chalcopyrite and sphalerite. This study indicates that mixing and boiling during the evolution of ore-forming fluids for the Maluntou deposit are key processes for the abnormal enrichment of precious metals in sphalerite and pyrite. The chalcopyrite micro/nano inclusions enhanced enrichment of precious metals in sphalerite provides new insights into the controls on the enrichment of precious metals in sulfides.
更新日期：2024-01-05
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