湘东北杨山庄金矿床流体成矿机制
发布时间：2018-10-17 10:44
【摘要】：杨山庄金矿床位于江南造山带中部,矿体严格受NW-NWW向断裂控制,赋存于新元古代浅变质的绢云母板岩和粉砂质板岩中,成矿期分为三个阶段:石英-毒砂-黄铁矿(少量)-自然金-白钨矿-白云石-白云母(阶段Ⅰ)、石英-毒砂-黄铁矿-自然金-黄铜矿-方铅矿-闪锌矿-绢云母(阶段Ⅱ)和石英-方解石(阶段Ⅲ)。成矿Ⅰ、Ⅱ阶段流体包裹体以两相水溶液包裹体为主,含有少量的气相包裹体和含CO_2的三相包裹体,气相包裹体成分为CH_4-N_2-CO_2、N_2-CO_2和N_2。成矿温度集中在240~320℃,盐度集中在7%~9%Na Cleqv,成矿流体为中-低温、中低盐度H_2O-Na Cl-CO_2体系。在成矿Ⅰ、Ⅱ阶段,成矿流体与围岩发生交代反应,流体发生相分离,使液相CO_2含量降低,引起Au(HS)~(2-)溶解度降低,导致金发生沉淀。
[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，
本文编号：2276406
[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，
本文编号：2276406
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