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矿床地质  2012 

新疆阿尔泰南缘加尔巴斯套铁矿床成矿时代及成矿作用研究

Keywords: 地球化学,矽卡岩铁矿,花岗岩,走滑-伸展,阿尔泰南缘

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Abstract:

加尔巴斯套铁矿床位于阿尔泰南缘克兰火山沉积盆地中。该矿床与产于额尔齐斯构造带北侧的可斯尔鬼花岗岩有直接的成因关系,属于典型的矽卡岩型富铁矿。岩体SHRIMPU-Pb年龄表明,该矿床略晚于287Ma形成;流体包裹体和稳定同位素研究显示,成矿阶段流体除岩浆水外,还有较多大气降水的参与,成矿流体主要表现为中低温、低盐度、中低密度特征;成矿物质主要来源于走滑-伸展背景下的可斯尔鬼花岗岩。结合前人研究成果,笔者认为在晚石炭世—早二叠世时期,阿尔泰南缘由走滑-伸展引发的大规模岩浆作用造就了区内有关铜、锌、镍、金、铁等广泛的成矿作用。

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