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首页> 外文期刊>Journal of Asian earth sciences >Genesis of end-Guadalupian bauxite and pyrite deposits in the Youjiang Basin (South China): Insights into the causative link between magmatic events and mass extinction
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Genesis of end-Guadalupian bauxite and pyrite deposits in the Youjiang Basin (South China): Insights into the causative link between magmatic events and mass extinction

机译：青春野原铝土矿和黄铁矿矿床的成因：岩江盆地（华南）：岩石事件与大规模灭绝致命联系的见解

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摘要

Mass extinction was commonly considered as the response to interaction between geosystems, and volcanism can be viewed as a vital link between the surface systems and deep geodynamic processes. This causative link between end-Guadalupian mass extinction and volcanism has been clarified, based on the research of bauxite and pyrite deposits in the Youjiang Basin, South China Block (SCB). Geochronological and geochemical evidences show that the source materials of bauxite-pyrite deposits were mainly derived from the Emeishan large igneous province (LIP) to the northwest and the continental arc along the SW margin of SCB associated with the subduction of the Paleo-Tethys Ocean underneath the Indochina block. Volcanic ash fallout by atmospheric dispersal driven by the easterly trade winds could best account for the spatial variation of both bauxite and pyrite deposits given their relative paleogeographic positions with respect to the two flanking sources. Massive volcanic tephra from arc volcanism fell on exposed carbonate platforms, underwent intensive chemical weathering and transformed into bauxites under the warm and humid tropical climate in Tethys, which could be also favored by acid precipitation caused by volcanic degassing. Extensive SO2 released from Emeishan LIP emission could be the major source of pyrite ores, probably with minor contribution from arc volcanism. This indicates that the prolonged and extensive continental arc volcanism induced environmental stress in the poorly-ventilated PaleoTethys Ocean, while the coincidental eruption of the large igneous provinces was the final straw, leading to the dramatic biotic crises during the Middle-Late Permian interval.
机译：大规模灭绝通常被认为是对地质系统之间对相互作用的响应，并且可以将火山中视为表面系统和深层地球动力学过程之间的重要联系。基于YouJiang Basin（SCB）的铝土矿和硫铁矿沉积物的研究，已经阐明了瓜达卢普群众灭绝和火山之间的这种致病联系。地理学和地球化学证据表明，铝土矿 - 硫铁矿沉积物的源材料主要来自峨眉山大火省（嘴唇）到西北地区和大陆弧线沿着SCB的SCB级联与拍摄的古代Thrys海洋俯冲相关吲哚Inina块。由东方贸易风驱动的大气分散火山灰辐射最佳地考虑到铝土矿和硫铁矿沉积物的空间变化，鉴于其相对古地理位置相对于两个侧翼源。来自弧形火山的大量火山岩落在暴露的碳酸盐平台上，接受了精密化学的化学风化，并在温暖和潮湿的热带气候下转化为铝土矿，这可能也是由火山脱气引起的酸沉淀而受到青睐。从峨眉山唇排放释放的广泛SO2可能是黄铁矿矿石的主要来源，可能是弧火山主义的轻微贡献。这表明，长期和广泛的大陆弧菌诱导了古代古物近期古本群岛的环境压力，而大火省的巧合爆发是最终的稻草，导致在中期二叠纪间隔期间戏剧性的生物危机。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第1期|104801.1-104801.13|共13页
  • 作者

    Yang Shujuan; Wang Qingfei; Lai Xulong; Qiao Long; Wang Ruixue; Huang Yuanxiao; Wang Yizhe;

  • 作者单位

    China Univ Geosci State Key Lab Geol Proc & Mineral Resources 29 Xueyuan Rd Beijing 100083 Peoples R China;

    China Univ Geosci State Key Lab Geol Proc & Mineral Resources 29 Xueyuan Rd Beijing 100083 Peoples R China;

    China Univ Geosci Key Lab Geobiol & Environm Geol Wuhan 430074 Peoples R China;

    China Univ Geosci State Key Lab Geol Proc & Mineral Resources 29 Xueyuan Rd Beijing 100083 Peoples R China;

    China Univ Geosci State Key Lab Geol Proc & Mineral Resources 29 Xueyuan Rd Beijing 100083 Peoples R China;

    China Univ Geosci State Key Lab Geol Proc & Mineral Resources 29 Xueyuan Rd Beijing 100083 Peoples R China;

    China Univ Geosci State Key Lab Geol Proc & Mineral Resources 29 Xueyuan Rd Beijing 100083 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Bauxite; Pyrite; Continental arc volcanism; Large igneous province; South China; Mass extinction;

    机译：铝土矿;黄铁矿;大陆弧火山;大火石省;华南;群众灭绝;

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