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矿床地质  2003 

甘肃礼县李坝大型金矿床成矿地质特征及成因

Keywords: 地球化学,秦岭造山带,李坝金矿,成矿年龄,稳定同位素

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Abstract:

文章以成矿地质条件、矿床地质特征为基础,通过Ar-Ar年龄测定、稳定同位素测试和地层含金性分析等,研究了李坝金矿床的成因。研究表明,李坝金矿床与中川花岗岩在时间、空间和成因上关系密切。含金石英脉Ar-Ar法、Rb-Sr法和Pb-Pb法年龄为210~171.6Ma,与中川岩体年龄(177~229Ma)吻合。包裹体水的δD-74‰~-83‰,δ18O水9.51‰~11.72‰,成矿流体水为岩浆水和大气降水的混合水。花岗岩提供了部分成矿物质来源,含矿热液通过F1导矿构造进入F3、F12等容矿断裂破碎带沉淀成矿。

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