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首页> 外文期刊>Journal of Asian earth sciences >Response of carbon isotopic compositions of Early-Middle Permian coals in North China to palaeo-climate change
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Response of carbon isotopic compositions of Early-Middle Permian coals in North China to palaeo-climate change

机译：华北早二叠世煤碳同位素组成对古气候变化的响应

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摘要

To investigate the magnitude to which the carbon isotopic ratio (delta C-13) varies in coals in response to their contemporary terrestrial environment, the Early-Middle Permian Huainan coals (including coals from the Shanxi Formation, Lower Shihezi Formation and Upper Shihezi Formation) in North China were systematically sampled. A 2.5 parts per thousand variation range of delta C-13 values (-25.15%o to -22.65%o) was observed in Huainan coals, with an average value of -24.06 parts per thousand. As coal diagenesis exerts little influence on carbon isotope fractionation, delta C-13 values in coals were mainly imparted by those of coal -forming flora assemblages which were linked to the contemporary climate. The delta C-13 values in coals from the Shanxi and Lower Shihezi Formations are variable, reflecting unstable climatic oscillations. Heavy carbon isotope is enriched in coals of the Capitanian Upper Shihezi Formation, implying a shift to high positive delta C-13 values of coeval atmospheric CO2. Notably, our study provides evidence of the Kamura event in the terrestrial environment for the first time.
机译：为了研究煤中碳同位素比（δC-13）随其现代陆地环境而变化的幅度，使用了中早二叠世淮南煤（包括山西组，下石河子组和上石河子组的煤）在华北地区进行了系统抽样。在淮南煤中观测到2.5千分之一的C-13增量值变化范围（-25.15％o至-22.65％o），平均值为千分之-24.06。由于煤炭成岩作用对碳同位素分馏几乎没有影响，因此煤炭中的δC-13值主要是由与现代气候相关的成煤菌群组合所赋予的。山西和下石河子组煤的δC-13值是可变的，反映了不稳定的气候振荡。 Capitanian上石河子组煤中富含重碳同位素，这意味着向近代大气CO2的正三角洲C-13值转移。值得注意的是，我们的研究首次提供了在地球环境中发生Kamura事件的证据。

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  • 来源
    《Journal of Asian earth sciences》 |2018年第1期|190-196|共7页
  • 作者

    Ding Dianshi; Liu Guijian; Sun Xiaohui; Sun Ruoyu;

  • 作者单位

    Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China|Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710075, Shaanxi, Peoples R China;

    Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China|Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710075, Shaanxi, Peoples R China;

    Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China;

    Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300350, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Coal; Carbon isotope; Permian; Huainan coalfield; Palaeo-climate; Kamura event;

    机译：煤炭;碳同位素;二叠纪;淮南煤田;古气候;镰仓事件;

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