Carbon and Oxygen Isotopic Compositions of Lacustrine Carbonates of the Shahejie Formation in the Dongying Depression and their Paleolimnological Significance

Liu Chuanlian

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.

Department of Marine Geology and Geophysics, Tongji university Shanghai 200092

Received Date: 1997-07-26

Rev Recd Date: 1998-04-26

Publish Date: 1998-12-10

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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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Reference (9)

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Carbon and Oxygen Isotopic Compositions of Lacustrine Carbonates of the Shahejie Formation in the Dongying Depression and their Paleolimnological Significance

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