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地球学报  2004 

青海东昆仑复合造山过程及典型造山型金矿地质

Keywords: 造山型金矿,复合造山,地质特征,东昆仑

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Abstract:

青海东昆仑是中国又一个重要的、极富潜力的金属成矿带。文章对区域地质构造环境与演化及典型金矿床地质特征进行了研究,并对区域金成矿作用进行了初步分析。结果表明,东昆仑是一个具有复杂演化历史的多旋回复合造山带,其中产出的金矿床不仅具有相似的基本地质特征,而且与早古生代和晚古生代一早中生代复合造山过程有密切的成因联系,并在产出构造环境、矿体特征、控矿构造、围岩蚀变、矿物组成和元素组合等方面与一般造山型金矿床极为相似,因此,应属典型的造山型金矿床。硫、铅同位素显示成矿物质为少量地幔与围岩地层混合的产物,金矿床主成矿时代对应于区域晚华力西一印支造山作用的晚期,流体不混溶是该区流体演化和成矿流体形成的重要机制。

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