Stable carbon and oxygen isotopic compositions of carbonates in middle Mesoproterozoic Wumishan Formation and sea-level change |
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Authors: | Renwei Li Jinshi Chen Shukun Zhang |
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Institution: | LI Renwei, CHEN Jinshi and ZHANG Shukun
Institute of Geology , Chinese Academy of Sciences , Beijing 100029, China ;
Institute of Geomechanies , Chinese Academy of Geological Sciences , Beijing 100083 , Chin |
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Abstract: | δ13 C of dolostones from the Wumishan Formation (1 310–1 207 Ma) in the Ming Tombs area near Beijing ranges from −1.5 to 1.5‰ (PDB), and generally, the δ18O ranges from −4 to −5‰ (PDB). The secular variation of stable carbon isotopic compositions is cyclic. δ13C displays positive shifts from a sequence boundary to 1.5 per mil (PDB), then a negative shifts to −1.5 per mil (PDB). In some unit, where δ13C values of the rocks are negative, they have relatively high δ18O values close to −4.0‰ (PDB). These characteristics of the carbon and oxygen isotopic compositions may be associated with sea-level changes. |
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Keywords: | carbon and oxygen isotopes Mesoproterozoic sea-level change |
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