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Anomalously high enrichment of mercury in early Cambrian black shales in South China

机译：南方早期寒武纪黑宝龙汞的异常高富集

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摘要

The widespread lower Cambrian black shales reflect a significant anoxic event during a global transgression, recording synergistic changes in the marine environment and biological evolution. Extremely high Hg (714-6187 ppb, average is 3380 ppb) contents and Hg to total organic carbon ratios (Hg/TOC: 120-765 ppb/wt. %) were observed in the Danquan section of South China, suggesting that extensive volcanic activities may occur during the early Cambrian. The redox condition of the Danquan section is euxinic as evidenced by multiple redox proxies, which include U/Th, V/Cr, Corg/P and authigenic enrichment of redox sensitive elements (MoEF, UEF). The Co*Mn - Al crossplot revealed that black shale developed in different geographical settings (upwelling setting for the Interval I, and restricted condition for the Interval II). Besides, the sedimentary Hg is hosted in different phases in the two intervals: in organic matter for the Interval I, and in sulfides for the Interval II. Moreover, the anomalous enrichment of Hg in both intervals document the Hg controlled by geographical settings and host phases. Thus, volcanic activities and geographical settings both constrain the evolution of life, as well as redox conditions.
机译：广泛的下寒武纪黑宝龙在全球违规期间反映了一个显着的缺氧事件，记录了海洋环境和生物进化中的协同变化。在南方丹泉段观察到极高的Hg（714-6187 ppb，平均为3380ppb）含量和Hg至总有机碳比（Hg / TOC：120-765 ppb / wt。％），表明广泛的火山在寒武纪的早期活动可能会出现活动。丹昆部分的氧化还原条件是由多个氧化还原代理证明的exininic，其包括U / Th，V / Cr，Corg / P和氧化还原敏感元素（Mof，UEF）的Authigenic富集。 CO * MN - Al Crossplot揭示了在不同地理设置中开发的黑色页岩（间隔I的升温设置，间隔II的限制条件）。此外，沉积Hg以两种间隔以不同的相中托管：在间隔I的有机物中，并且在硫化物中为间隔II。此外，两种间隔中Hg的异常富集文件记录了由地理环境和宿主阶段控制的HG。因此，火山活动和地理设置都限制了生活的演变，以及氧化还原条件。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第15期|104794.1-104794.12|共12页
  • 作者

    Zhu Guangyou; Zhao Kun; Li Tingting; Zhang Zhiyao; Tang Shunlin; Wang Pengju;

  • 作者单位

    PetroChina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China;

    Chengdu Univ Technol Inst Sedimentary Geol Chengdu 610059 Peoples R China|China Univ Geosci Beijing 100083 Peoples R China;

    PetroChina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China;

    PetroChina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China;

    Henan Polytech Univ Inst Resources & Environm Jiaozuo 454000 Henan Peoples R China;

    China Univ Geosci Beijing 100083 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Mercury content; Redox condition; Early Cambrian; Black shale; South China;

    机译：汞含量;氧化还原条件;早期寒武纪;黑色页岩;华南;

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