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The link between exceptional fossil preservation and palaeo-redox conditions in the Middle Triassic Luoping Biota from South China
Geological Journal ( IF 1.4 ) Pub Date : 2021-02-15 , DOI: 10.1002/gj.4106 Zhixin Ma 1 , Shixue Hu 1 , Xiting Liu 2, 3 , Changyong Zhou 1 , Wen Wen 1 , Qiyue Zhang 1 , Jinyuan Huang 1, 4, 5 , Xiao Min 1
Geological Journal ( IF 1.4 ) Pub Date : 2021-02-15 , DOI: 10.1002/gj.4106 Zhixin Ma 1 , Shixue Hu 1 , Xiting Liu 2, 3 , Changyong Zhou 1 , Wen Wen 1 , Qiyue Zhang 1 , Jinyuan Huang 1, 4, 5 , Xiao Min 1
Affiliation
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The Luoping Biota represents of the recovery of marine ecosystems after the Permian–Triassic Mass Extinction. To better understand the palaeoenvironmental background of the Luoping Biota, sedimentary analysis and multi-geochemical proxies (Mo, U, V, V/Cr, MoEF, UEF, and VEF) were assessed in Member II of the Middle Triassic Guanling Formation of the Xiangdongpo section in Luoping County, Yunnan Province. According to the facies characteristics and redox-sensitive elemental proxies, in combination with macrofossil and bioturbation evidence, five intervals (I, II, III, IV, and V) were recognized. The exceptional preservation of the fossils is related to two anoxic intervals (II and IV) sandwiched by three suboxic intervals (I, III, and V). Based on this study and regional correlation, it is concluded that anoxia in the water-column increased the preservation potential of macrofauna fossils and inhibited the survival of trace-making organisms. In addition, microbial mats could produce local anoxic and restricted micro-environments, preventing the disarticulation of the carcasses by water turbulence. Therefore, we demonstrate that anoxic conditions played a key role in the exceptional fossil preservation of the Luoping Biota.
中文翻译：
华南中三叠世罗平生物群特殊化石保存与古氧化还原条件之间的联系
罗平生物群代表了二叠纪-三叠纪大灭绝后海洋生态系统的恢复。为了更好地了解罗平生物群的古环境背景，沉积分析和多地球化学代理（Mo、U、V、V/Cr、Mo EF、U EF和V EF)在云南省罗平县湘东坡剖面中三叠统关岭组二段进行评价。根据相特征和氧化还原敏感元素代理，结合大型化石和生物扰动证据，识别出五个区间（I、II、III、IV和V）。化石的特殊保存与夹在三个缺氧区间（I、III 和 V）之间的两个缺氧区间（II 和 IV）有关。基于本研究和区域相关性，得出结论：水体缺氧增加了大型动物群化石的保存潜力，并抑制了寻迹生物的生存。此外，微生物垫可以产生局部缺氧和受限的微环境，防止尸体因水湍流而脱节。所以，
更新日期：2021-02-15
中文翻译：
华南中三叠世罗平生物群特殊化石保存与古氧化还原条件之间的联系
罗平生物群代表了二叠纪-三叠纪大灭绝后海洋生态系统的恢复。为了更好地了解罗平生物群的古环境背景，沉积分析和多地球化学代理（Mo、U、V、V/Cr、Mo EF、U EF和V EF)在云南省罗平县湘东坡剖面中三叠统关岭组二段进行评价。根据相特征和氧化还原敏感元素代理，结合大型化石和生物扰动证据，识别出五个区间（I、II、III、IV和V）。化石的特殊保存与夹在三个缺氧区间（I、III 和 V）之间的两个缺氧区间（II 和 IV）有关。基于本研究和区域相关性，得出结论：水体缺氧增加了大型动物群化石的保存潜力，并抑制了寻迹生物的生存。此外，微生物垫可以产生局部缺氧和受限的微环境，防止尸体因水湍流而脱节。所以，
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