Carbon and Oxygen Isotopic Compositions of Lacustrine Carbonates of the Shahejie Formation in the Dongying Depression and their Paleolimnological Significance
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摘要: 湖相碳酸盐岩的碳、氧稳定同位素分析能提供重要的环境信息。山东东营凹陷沙河街组湖相碳酸盐岩主要分布在沙一段和沙四段。对47个碳酸盐岩样品碳、氧同位素组分的分析表明：沙一段、沙四中和沙四上亚段下部沉积时期东营湖均是程度不同的封闭型湖泊。古盐度和蒸发／降雨：沙四中亚段和沙四上亚段下部沉积时期＞沙一段沉积时期＞沙四上亚段上部沉积时期；古湖水面：沙四上亚段上部沉积时期＞沙一段沉积时期＞沙四中亚段和沙四上亚段下部沉积时期；古生产力：沙一段沉积时期＞沙四上亚段上部沉积时期＞沙四中亚段和沙四上亚段下部沉积时期。Abstract: The stable carbon and oxygen isotopic compositions of lacustrine carbonates can yield useful pale-oenvironmental information. The lacustrine carbonates mainly distribute in the first member (Es1) and the 4th member (Es4) of the Shahejie Formation in the Dongying depression, Shandong. Stable-isotopic analysis of 47 lacustrine carbonate samples have been carried out to reconstract the paleohydrology, pale-ochemistry and paleoproductivity of Dongying Lake during Shahejie Formation depositionnal period. The results show that Dongying Lake is a closed lake during Es1 and Es4 deposition period. The other pale-olimnological characteristics are: Paleosalinity and E/P: middle Es4 lower upper Es4> Es1> upper up-per Es4; Paleolake level: upper upper Es4> Es1> middle Es4 lower upper Es4; Paleoproductivity: Es1> upper upper Es4> middle Es4 lower upper Es4.
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Key words:
- Dongying depression /
- Shahejie Formation /
- carbonates /
- carbon isotope /
- oxygen isotope paleolimnology
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