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Carbon and sulfur isotopic compositions of Early Cambrian black shales, NW Hunan, China: Implications for the Paleoceanographic sedimentary environment

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Abstract

In order to better understand the paleoceanographic sedimentary environment of the Lower Cambrian black shales extensively distributed in South China, outcropped along the present southern margin of the Yangtze Platform with a width of ca. 200–400 km and a length of more than 1500 km, we present new paired δ13C data on carbonates (δ13Ccarb) and associated organic carbon (δ13Corg) and δ34Spy data on sedimentary pyrite in black shales from three sections (Ganziping, Shancha and Xiaohekou) located in NW Hunan, China. In these sections, a total of 82 Lower Cambrian black shale samples have δ13Ccarb values ranging from −4.0‰ to 1.7‰ with an average value of −2.1‰, and δ13Corg values between −34.9‰ and −28.8‰, averaging −31.9‰. The δ34Spy values of 16 separated sedimentary pyrite samples from the black shales vary between +10.2‰ and +28.7‰ with an average value of +19.5‰, presenting a small isotope fractionation between seawater sulfate and sedimentary sulfide. The model calculation based on credible data from the paired analyses for δ13Ccarb and δ13Corg of 11 black shale samples shows a high CO2 concentration in the Early Cambrian atmosphere, about 20 times higher than pre-industrial revolution values, consistent with previous global predictions. The small sulfur isotope fractionation between seawater sulfate and sedimentary sulfide in black shales, only 15.5‰ on average, implies a low sulfate level in the Early Cambrian seawater around 1 mmol. In combination with a high degree of pyritization (DOP) in the black shales, it is suggested that sulfidic deep-ocean water could have lingered up to the earliest Cambrian in this area. The black shale deposition is envisaged in a stratified marine basin, with a surface euphotic and oxygenated water layer and sulfidic deeper water, controlled by a continental margin rift.

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Authors and Affiliations

  1. State Key Laboratory for Mineral Deposit Research, Nanjing University, Nanjing, 210093, China

    Dongsheng Ma, Chunyan Yao & Haifeng Ding

  2. Department of Geoscience and Resource Information, East China Institute of Technology, Fuzhou, 344000, China

    Shuanglin Cao, Jiayong Pan & Fei Xia

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  1. Dongsheng Ma
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  2. Shuanglin Cao
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  3. Jiayong Pan
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  4. Fei Xia
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  5. Chunyan Yao
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  6. Haifeng Ding
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Correspondence to Dongsheng Ma.

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Ma, D., Cao, S., Pan, J. et al. Carbon and sulfur isotopic compositions of Early Cambrian black shales, NW Hunan, China: Implications for the Paleoceanographic sedimentary environment. Chin. J. Geochem. 30, 332–345 (2011). https://doi.org/10.1007/s11631-011-0517-3

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