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地球学报  2004 

羌塘盆地雁石坪地区中-晚侏罗世碳、氧同位素特征与沉积环境分析

Keywords: 碳同位素,氧同位素,羌塘盆地,雁石坪,侏罗系

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Abstract:

通过对雁石坪地区中-上侏罗统碳酸盐岩的碳、氧同位素组成特征分析,认为其原始组分保存良好。在垂向上,碳、氧同位素的变化与沉积相演化和海平面曲线相吻合,说明它们与沉积环境的演化密切相关。结合碳、氧同位素的环境效应分析,认为中侏罗世雀莫错期沉积水体主要以陆源淡水作用为主,沉积环境属陆缘近海湖;布曲期为广海碳酸盐台地环境;夏里期为三角洲-淡化泻湖-潮坪环境。晚侏罗世索瓦早期为高盐度、高水温,相对局限浅海碳酸盐台地环境。中侏罗世至晚侏罗世早期经历了一次完整的海侵-海退旋回和一次海侵过程。

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