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内蒙古哈达特陶勒盖铅锌矿区辉绿岩岩石化学研究

, PP. 118-126

Keywords: 岩石化学,Pb同位素,辉绿岩,哈达特陶勒盖,内蒙阿巴嘎旗

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Abstract:

哈达特陶勒盖铅、锌矿区的辉绿岩是隐伏岩体。本文在野外地质工作和钻孔岩芯观察基础上,运用岩石化学和同位素地质学方法,通过主量元素、微量元素、稀土元素和铅同位素研究,探讨了辉绿岩岩石化学性质、形成构造环境及成岩物质来源。岩石化学研究表明,辉绿岩具有低硅、钛和高铁,大离子亲石元素(LILE)明显富集,高场强元素(HFSE)相对亏损的特征,形成于俯冲火山弧构造环境,属于碱性辉绿岩。Pb同位素显示辉绿岩具有岛弧玄武岩特征,成岩物质来源于岩石圈地幔,侵位过程中可能混染了部分地壳物质。

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