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Immature organic matter in lacustrine source rocks from the Jianghan Basin, eastern China, was studied for distributions and stable carbon isotopic compositions (δ 13 C) of hydrocarbon biomarkers. All of the bitumens contain isorenieratane (δ 13 C ca. −17‰) indicating the presence of Chlorobiaceae, and thus periods of euxinic conditions extended into the photic zone. Aliphatic hydrocarbon...
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