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豫西卢氏八宝山铁铜多金属矿床黄铁矿成分研究

, PP. 128-138

Keywords: 八宝山铁铜多金属矿床,斑岩成矿体系,黄铁矿,氧化还原环境,卢氏

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Abstract:

豫西卢氏八宝山铁铜多金属矿床是华北克拉通南缘中生代斑岩成矿体系中以铁矿化为主的矿床,其中南矿带和西矿带广泛发育黄铁矿。电子探针成分显示,黄铁矿的主要元素S和Fe的总和超过90%,但同一种黄铁矿表面不同位置微量元素Cu和As的含量存在突变。这种突变说明,来源于同一岩浆热液系统的富液相流体与上升的富气相流体的混合作用是引起黄铁矿沉淀的主要机制。黄铁矿中的As有两种赋存价态As3+和As1?,代表了八宝山斑岩矿床中形成黄铁矿的岩浆流体可能经历了先氧化后还原的环境(As3+指示氧化环境,As1?指示还原环境),说明八宝山矿区具有斑岩铜矿的成矿潜力。

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