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矿床地质  2002 

湘中锑(金)矿床成矿物质来源——Ⅰ.微量元素及其实验地球化学证据

Keywords: 地球化学,成矿物质来源,微量元素,淋滤实验,锑(金)矿床,湘中地区

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Abstract:

为了查明湘中盆地中-低温锑(金)矿床的成矿物质来源,文章应用高分辨率ICP-MS、ICP-AES等方法对岩石与矿石进行了系统测定,并结合作者以往分析数据和实验地球化学结果,对该区盆地及周边基底地层与矿床中的微量元素分布特征及其水/岩反应效应进行了综合分析和系统研究。结果表明:Sb,Au等成矿元素在元古界基底碎屑岩中具有高的背景含量;在近似成矿条件的水/岩反应实验中,成矿元素的淋出率达20%~90%;元古界基底碎屑岩中的金(锑、钨)矿床的周围蚀变围岩中出现明显的金负异常区,而盆地内泥盆系地层中的高锑含量仅局限于锑矿床(化)及其蚀变围岩中;湘中锑(金)矿床中的矿石与基底碎屑岩具有相似的稀土元素球粒陨石标准化配分曲线特征。以上微量元素地球化学特征充分证明该区锑(金)矿床锑、金等成矿物质主要来源于元古界基底碎屑岩。

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