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地质学报  2006 

鄂尔多斯盆地西缘汝箕沟煤矿区的石英脉及其地质意义

, PP. 768-774

Keywords: 鄂尔多斯盆地西缘,宁夏汝箕沟,无烟煤,石英脉,发育特征,地质意义

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Abstract:

鄂尔多斯盆地西缘地处特殊的大地构造位置,其间的宁夏汝箕沟出产世界上最优质的无烟煤,该区多年来一直被多学科科研人员所关注。笔者从地质背景入手,较详细的论述了汝箕沟矿区石英脉的岩性、与围岩的接触关系、规模、时空分布、产状、组合、矿物包裹体等发育特征,比较了该区石英脉与诸多煤田和煤系中脉岩的差异。综合分析认为,该区石英脉与推测隐伏火成岩体紧密相关,深部岩浆分异后期的气成热液上涌是石英脉形成的主导因素。石英脉对该区构造热事件、深大断裂活动、煤变质类型等有一定指示意义。本文研究表明,汝箕沟侏罗纪煤变质与盆地油、气成藏同受晚侏罗世―早白垩世期间的构造热事件影响,同一重大地质事件在盆地内部和边缘表现形式有别,各地响应方式不同。

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