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地球学报  2010 

河北省东坪金矿钾质蚀变岩中的两期锆石年代学研究及意义

DOI: 10.3975/cagsb.2010.06.08

Keywords: 钾质蚀变岩,锆石U-Pb定年,岩浆锆石,热液锆石,东坪金矿,河北省

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Abstract:

河北省崇礼县东坪金矿位于水泉沟碱性杂岩体内,金矿石包括低硫化物石英脉型和钾质蚀变岩型两种类型。本次工作我们对采自东坪金矿70号脉深部的钾质蚀变岩中的锆石进行了成因矿物学和成矿年代学研究,结果表明,矿脉中的锆石可以分成岩浆锆石和热液锆石两种成因类型。岩浆锆石具有自形到半自形结构,在背散射电子图像(BSE)上呈暗灰色,在阴极发光图像(CL)上具有明显的岩浆振荡环带,锆石U-Pb加权平均年龄为382.8±3.3Ma。热液锆石多呈不规则状充填在岩浆锆石中,在BSE图像上呈亮灰白色,在CL图像上为深黑色(无阴极发光),锆石的Th、U含量和Th/U比值较岩浆锆石明显增高,锆石U-Pb加权平均年龄为140.3±1.4Ma,说明东坪金矿形成于早白垩世。140Ma成矿年龄的发现,为认识河北省东坪金矿的成矿时代提供了新证据,具有重要的地质意义。

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