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矿床地质  2006 

新疆哈密镜儿泉伟晶岩型稀有金属矿床40Ar-39Ar年龄及其地质意义

Keywords: 地球化学,印支期,伟晶岩型稀有金属矿床,白云母40Ar-39Ar法测年,镜儿泉,新疆

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Abstract:

文章通过对哈密镜儿泉伟晶岩型稀有金属矿床中白云母的40Ar-39Ar同位素定年研究,测得该矿床的同位素年龄数据,其坪年龄为(243±2)Ma。这一结果显示,镜儿泉的含稀有金属伟晶岩脉是在印支期形成的,并且在形成之后没有再受到后期地质事件的影响。与阿尔泰成矿省相似,东天山在印支期也发生了伟晶岩型稀有金属的成矿作用。这表明,东天山地区的成矿演化与阿尔泰地区具有可比性,从而为2个地区的地质找矿指出了新的方向。

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