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地质学报  2004 

东喜马拉雅南迦巴瓦地区区域地质特征及构造演化

, PP. 744-751

Keywords: 构造演化,地质特征,东构造结,喜马拉雅造山带

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Abstract:

研究区位于喜马拉雅造山带的东构造结。本文以区域地质填图成果为基础,结合前人资料,首先对研究区进行了构造单元划分,其次对各构造单元的地质特征进行了总结,最后对构造演化和有关问题进行了探讨。结论为:1南迦巴瓦地区可以划分为冈底斯―拉萨陆块、雅鲁藏布江缝合带和印度陆块3个一级构造单元。以蛇绿混杂岩为代表的雅鲁藏布江缝合带呈向NE凸的马蹄状连续分布;印度陆块由被称为南迦巴瓦岩群的高喜马拉雅结晶岩系单独构成,南迦巴瓦岩群由以含高压麻粒岩透镜体为标志的直白岩组、派乡岩组和多雄拉混合岩组成。2印度―欧亚板块碰撞的时间早于70Ma;23Ma以来主要断层的运动性质以伸展拆离作用为主;大约5Ma时发生了大规模的混合岩化和深熔作用。3地幔上隆是本区快速隆升的关键因素,但河流的作用同样功不可没

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