کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4696968 1637234 2015 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Geology and geochemistry of listwaenite-related gold mineralization in the Sayi gold deposit, Xinjiang, NW China
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله
Geology and geochemistry of listwaenite-related gold mineralization in the Sayi gold deposit, Xinjiang, NW China
چکیده انگلیسی

The Sayi gold deposit is part of the Sartohay ophiolitic mélange in west Junggar, Xinjiang, China, and is hosted by listwaenite, which was transformed from serpentinite in a shear zone via fluid–rock reaction. Gold mineralization is hosted by mylonitized listwaenites and quartz veins within listwaenite lenses, formed during shearing. Our study demonstrates that fluid concentrated Au, Ag, As, Sb, Cu, Cr, Ni, and Co during transformation from serpentinite to listwaenite and ductile deformation. Deformation due to shearing played an important role in focusing ore-forming fluid along the shear zone. Gold mineralization accompanied formation of hydrothermal minerals in the following stages: carbonate–quartz–pyrite (CQP, stage I), mariposite–gersdorffite–gold (MGG, II), quartz–carbonate–pyrite (QCP, III), gold-bearing quartz (IV) and dolomite–calcite stage (V). Geological characteristics of MGG in mylonitized listwaenite demonstrate that gold mineralization formed during the transition from ductile to brittle deformation, which was followed by gold-bearing quartz veins filling brittle fractures. The Au contents show a positive correlation with Ag, As, Cu, and Sb contents in mylonitized listwaenite samples, consistent with the coexistence of native gold, gersdorffite, arsenian pyrite, and chalcopyrite in mylonitized listwaenite. Pressure decrease due to hydraulic fracturing during the transition from ductile to brittle deformation induced gold deposition in the Sayi deposit.

Gold mineralization is hosted by mylonitized listwaenites and quartz veins within listwaenite lenses, formed during shearing.Pressure decrease due to hydraulic fracturing during the transition from ductile to brittle deformation induced gold deposition.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ore Geology Reviews - Volume 70, October 2015, Pages 61–79
نویسندگان
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