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地质论评  2007 

新疆库鲁克塔格地区新元古代末期汉格尔乔克冰期成因新证据

Keywords: 冰川帽碳酸盐岩新元古代新疆

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Abstract:

新疆是世界上保存有完整的新元古代三大冰期的地区之一,有关新疆新元古代最末期冰期为大陆冰川早就提出,但由于证据不充分而一直受到质疑。汉格尔乔克冰碛砾岩具有典型的冰川“落石”,属于典型的冰川沉积,对其上覆的帽碳酸盐岩进行系统的碳、氧同佗素研究证明,帽碳酸盐岩具有全球新元古代冰后碳酸盐岩沉积类似的碳同位素负异常特征,特别是在帽碳酸盐岩底部发现具有典型的大气淡水成因的白云岩,证明汉格尔乔克冰期为大陆冰川。

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