【摘要】：楊山莊金礦床位于江南造山帶中部,礦體嚴(yán)格受NW-NWW向斷裂控制,賦存于新元古代淺變質(zhì)的絹云母板巖和粉砂質(zhì)板巖中,成礦期分為三個(gè)階段:石英-毒砂-黃鐵礦(少量)-自然金-白鎢礦-白云石-白云母(階段Ⅰ)、石英-毒砂-黃鐵礦-自然金-黃銅礦-方鉛礦-閃鋅礦-絹云母(階段Ⅱ)和石英-方解石(階段Ⅲ)。成礦Ⅰ、Ⅱ階段流體包裹體以兩相水溶液包裹體為主,含有少量的氣相包裹體和含CO_2的三相包裹體,氣相包裹體成分為CH_4-N_2-CO_2、N_2-CO_2和N_2。成礦溫度集中在240~320℃,鹽度集中在7%~9%Na Cleqv,成礦流體為中-低溫、中低鹽度H_2O-Na Cl-CO_2體系。在成礦Ⅰ、Ⅱ階段,成礦流體與圍巖發(fā)生交代反應(yīng),流體發(fā)生相分離,使液相CO_2含量降低,引起Au(HS)~(2-)溶解度降低,導(dǎo)致金發(fā)生沉淀。
[Abstract]:The Yangshanzhuang gold deposit is located in the middle of the Jiangnan orogenic belt. The orebody is strictly controlled by the NW-NWW trending fault and occurs in the Neoproterozoic shallow metamorphic sericite slate and silty slate. The metallogenic period is divided into three stages: quartz-arsenopyrite-pyrite (a small amount)-natural gold-scheelite-dolomite-Muscovite (stage I), quartz-arsenopyrite-pyrite-natural gold-chalcopyrite-galena-sphalerite-sericite Mica (stage 鈪，

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