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首页> 中文期刊> 《地球化学》 >黑龙江省高松山浅成低温热液金矿床围岩蚀变元素迁移特征、定量计算与形成机制

黑龙江省高松山浅成低温热液金矿床围岩蚀变元素迁移特征、定量计算与形成机制

         
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摘要

The Gaosongshan epithermal gold deposit is hosted in a Lower Cretaceous andesite. Ore bodies occur as veins controlled by fractured zones in wall rocks. Hydrothermal alteration are well developed in the Gaosongshan gold deposit, including silicification, pyritization, adularization, illitization, sericitization, carbonatization, chloritization, etc. According to alteration mineral assemblage and whole rock geochemistry, 3 alteration zones have been identified (proximal to distal):strong silicification-adularization zone, silicification-illitization-adulari-zation zone and adularization-propylitization zone. This paper focuses on estimating the migration pattern of elements by quantitative calculation and graphical methods, and discussing the link between alteration mineralogy and elements migration. Results show that alteration process of andesite is closely related to Au mineralization, especially silicification, adulariazation and pyritization. Based on the relationship between alteration process and mineralization, we discussed the hydrothermal alteration forming mechanism of the Gaosongshan gold deposit.%高松山浅成低温热液金矿床赋存于下白垩统安山岩等中基性火山岩中。矿体受围岩中断裂破碎带的控制，呈脉状产出。矿区围岩蚀变主要发育硅化、黄铁矿化、冰长石化、伊利石化、绢云母化、碳酸盐化和绿泥石化等。根据蚀变矿物组合和蚀变岩地球化学特征，可将围岩蚀变由近矿至远矿分为3个带：强硅化-冰长石化带、硅化-伊利石化-冰长石化带、伊利石化-青磐岩化带。对各蚀变带进行了全岩元素地球化学分析，利用元素迁移定量计算和图解等方法详细估算和拟定了蚀变过程中元素的迁移规律及其与蚀变矿物学之间的联系。结果表明，安山岩蚀变过程与金矿化密切相关，特别是硅化、冰长石化和黄铁矿化蚀变阶段。根据围岩蚀变形成过程与成矿之间的联系，探讨了高松山金矿床围岩蚀变的形成机制。

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