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地球学报  2008 

羌塘盆地隆额尼-昂达尔错古油藏的白云岩组构特征及铅同位素意义

DOI: 10.3975/cagsb.2008.01.09

Keywords: 白云岩,岩石组构,铅同位素,羌塘盆地

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Abstract:

以系统的岩石学及沉积相分析为基础,深入探讨了隆额尼-昂达尔错古油藏白云岩及其伴生灰岩的铅同位素特征,认为该区白云岩及伴生灰岩具有统一的铅来源,铅主要来自中央隆起带变质岩、岩浆岩及再旋回沉积的三叠系地层,为地幔、造山带、地壳等多源混合的异常铅.铅元素在含量上与沉积相带关系十分明显,仍受沉积过程的控制,后期构造作用并未带入大量深部流体进行白云岩的交代作用.该区白云岩仍保存有大量具成因意义的组构信息,主要体现在:典型混合水交代成因的雾心亮边结构、等厚环边和世代生成结构、残余鲕粒结构及藻纹层构造等,该区白云岩为混合水交代成因.构造只是起到白云岩化后期的改造作用.

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