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沉积学报  2015 

柴达木盆地鄂博梁Ⅲ号中新统成岩作用及沉积环境

DOI: 10.14027/j.cnki.cjxb.2015.02.013, PP. 337-347

Keywords: 碳氧同位素,碳酸盐胶结物,上干柴沟组,中新统,鄂博梁Ⅲ号构造带

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Abstract:

综合运用岩石学、矿物学和元素地球化学等方法,对柴达木盆地北缘构造带鄂博梁Ⅲ号构造中新统上干柴沟组碎屑岩的成岩作用、形成环境和物质来源等进行了系统研究。发现上干柴沟组碎屑岩中碎屑颗粒间主要以点—线接触关系为主,长粒矿物被定向排列,经历过较强的压实作用。其中黏土矿物含量较高,平均达到了35.03%,主要以伊利石,绿泥石及伊—蒙混层为主。碳酸盐胶结物类型主要以方解石为主,仅含有少量白云石。碳酸盐胶结物的碳氧同位素含量测定表明,碳同位素(δ13C)分布在-6.8‰~-4.0‰之间,平均为-5.0‰;氧同位素(δ18O)分布于-11.1‰~-5.4‰,平均为-8.7‰;根据碳氧同位素含量推算古盐度Z值分布于108.34~114.89,平均值为112.77;碳酸盐沉淀温度分布在43.36℃~77.84℃,平均值为62.30℃。结合对主量元素、微量元素及有机碳含量等地球化学元素的综合分析,认为鄂博梁Ⅲ号构造带中新统上干柴沟组目前所处的成岩阶段主要为早成岩阶段B期至中成岩阶段A期,在形成早期主要以干、冷的淡水—微咸水环境为主,晚期则以要对暖、湿的淡水环境为主。

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