Continental records of organic carbon isotopic composition (δ13Corg), weathering, paleoclimate and wildfire linked to the End-Permian Mass Extinction
Continental records of organic carbon isotopic composition (δ13Corg), weathering, paleoclimate and wildfire linked to the End-Permian Mass Extinction
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与二叠纪末大规模灭绝有关的有机碳同位素组成（δ13Corg）、风化、古气候和野火的大陆记录
DOI：
10.1016/j.chemgeo.2020.119764
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发表时间：
2020-12
期刊：
影响因子：
3.9
通讯作者：
Jason Hilton
中科院分区：
文献类型：
--
作者：
鲁静;张培新;杨敏芳;邵龙义;Jason Hilton
晚二叠世是泛古陆组合的顶点，全球板块的碰撞和俯冲accompanied.by地球表面系统的大气成分、古气候和古环境发生了重大变化。这些事件在特提斯洋的海相层序中有广泛的记录，但在缺乏高分辨率地层控制的陆相层序中却知之甚少。为了揭示陆相地层中的这些波动及其与二叠纪末大灭绝（EPME）的关系，我们对华北板块禹州煤田晚二叠世长兴期至早三叠世印度期的大陆δ ~（13）Corg、汞和镍浓度、野火和气候变化等指标进行了研究。（NCP）。结果表明，长兴期孙家沟组有机碳同位素有两次负偏移，第一次（CIEeI，2.2‰）发生在长兴期中期，第二次（CIE-II，2.7 ‰）发生在长兴期末期，与化学蚀变指数（CIA）值和植物物种灭绝的峰值相吻合。我们推断CIE-Ⅱ是δ ~（13）Corg与EPME有关的整体负漂移。根据高岭石含量低和大陆风化弱的特点，除两次相对湿度较高的短期事件符合CIE-Ⅰ和CIE-Ⅱ标准外，从长兴期到印度早期，研究区气候普遍干旱。极高的丝质体含量（x = 63.1%）和其在长兴期的增加表明，频繁的野火可能是导致EPME陆地植被生态系统破坏和陆地生物多样性迅速下降的直接原因。我们认为，陆地生态系统可能在EPME的海洋群落灭绝中发挥了重要作用。这是首次根据碳同位素负偏移、同期风化趋势、Ni/Al比值和生物沉积等综合证据，在NCP中证实EPME，为准确识别和对比NCP中大陆环境的EPME迈出了重要一步。
The late Permian was the acme of Pangea assembly, with collision and subduction of global plates accompanied.by major changes in atmospheric composition, paleoclimates and paleoenvironments of the Earth's surface.system. These events are extensively recorded in marine successions from the Tethys, but much less are known.from continental successions that typically lack high-resolution stratigraphic control. In order to reveal these.fluctuations in terrestrial strata and their relationship with the End-Permian Mass Extinction (EPME), we investigate continental δ13Corg, mercury and nickel concentrations, wildfire, and climate change proxies from the.late Permian Changhsingian stage to Early Triassic Induan stage in the Yuzhou coalfield in the North China Plate.(NCP). Results show two negative organic carbon isotope excursions (CIE) within the Changhsingian aged.Sunjiagou Formation, the first (CIEeI, 2.2‰) during mid-Changhsingian and a second, larger, excursion (CIE-II,.2.7‰) near the end of the Changhsingian that coincides with the peaks in the Chemical Index of Alteration (CIA).value and extinction of plant species. We infer CIE-II to be the global negative excursion of δ13Corg associated.with the EPME. Arid climates prevailed in the study area from the Changhsingian to the early Induan inferred.from the low kaolinite contents and weak continental weathering, except for two short-duration episodes with.higher humidity that correspond with CIE-I and CIE-II. Extremely high fusinite content (x̄ = 63.1%) and its.increasing abundance through the Changhsingian indicates that frequent wildfires may have been a direct cause.for both the destruction of terrestrial vegetation ecosystems and the rapid decline of terrestrial biodiversity at the.EPME. We consider that terrestrial ecosystems may have played an important role in the extinction of marine.communities at the EPME. This represents the first time the EMPE has been demonstrated in the NCP based on.combined evidence from negative carbon isotope excursion, concurrent weathering trends, Ni/Al ratio and biotic.extinctions, representing an important step in accurately identifying and correlating the EPME in continental.settings from the NCP.
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影响因子：
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影响因子：
5.8
作者：
Jun Shen;Thomas J Algeo;Qing Hu;Ning Zhang;Lian Zhou;Wenchen Xia;Qinglai Feng
通讯作者：
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影响因子：
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