Evidence for the expansion of anoxia during the Smithian from a quantitative interpretation of paired C-isotopes
Evidence for the expansion of anoxia during the Smithian from a quantitative interpretation of paired C-isotopes
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从成对 C 同位素的定量解释中证明史密斯时期缺氧扩大的证据
DOI：
10.1016/j.gloplacha.2021.103551
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发表时间：
2021-09
影响因子：
3.9
通讯作者：
Yanan Shen
中科院分区：
文献类型：
--
作者：
Guijie Zhang;Xiaolin Zhang;D;an Li;Haishui Jiang;Yilun Xu;Menghan Li;Yanan Shen
史密斯负碳同位素漂移是二叠纪末生物大灭绝事件后全球碳循环的主要扰动之一。在史密斯时期发生了深刻的海洋学和生物学变化，但驱动负碳同位素漂移的机制及其与海洋环境和生物变化的联系仍然受到很大的限制。本文利用华南嘉荣剖面早Smithian至早Spathian的高分辨率碳同位素记录，探讨了碳循环扰动的起源及其与同期环境变化的关系。成对的碳同位素数据显示，在史密斯时期，δ 13 C碳和δ 13 C碳的平行负偏移可以在全球范围内进行关联。全球Smithian负碳同位素漂移与全球海侵和海洋缺氧具有良好的一级对应关系。数值箱模拟的结果表明，Smithian负碳同位素偏移可能是由于海侵过程中缺氧底层沃茨向上运动，导致有机碳氧化增加而产生的。有机碳的氧化衰变主要是由大气-海洋系统中氧和硫酸盐的消耗所推动的。因此，我们使用该模型来量化的氧化剂消耗率，可能需要模拟全球史密斯负碳同位素漂移通过有机碳氧化。模拟结果表明，在史密斯时期的有机碳氧化可能产生了对海洋氧化剂的高需求，导致缺氧的扩大。我们的研究提供了定量的限制之间的因果关系的史密斯负碳同位素漂移和广泛的缺氧。史密斯负碳同位素漂移的最低点与生物多样性的严重丧失相吻合，这表明缺氧沃茨的海侵向上运动引起的缺氧扩张可能导致了晚期史密斯灭绝。因此，这可能是早三叠世生物恢复时间延长的原因之一。
The Smithian negative C-isotope excursion was one of the major perturbations of the global carbon cycle following the end-Permian mass extinction event. Profound oceanographic and biological changes occurred during the Smithian, but the mechanism driving the negative C-isotope excursion and its links with marine environmental and biotic changes remain poorly constrained. Here, we use high-resolution paired C-isotope records from the early Smithian to the early Spathian in the Jiarong section, South China, to investigate the origin of the carbon cycle perturbation and its relationship with contemporaneous environmental changes. The paired C-isotope data reveal parallel negative excursions in both δ13Ccarband δ13Corgduring the Smithian that can be correlated globally. The global Smithian negative C-isotope excursion shows a good first-order correspondence with global transgression and ocean anoxia. The results of numerical box modeling suggest that the Smithian negative C-isotope excursion could have been generated by increased organic carbon oxidation in response to the upward movement of anoxic bottom waters during transgression. The oxidative decay of organic carbon is primarily fueled by the consumption of oxygen and sulfate in the atmosphere–ocean system. Hence, we use the model to quantify the oxidants consumption rate that could be required to simulate the global Smithian negative C-isotope excursion through organic carbon oxidation. The modeling results show that the organic carbon oxidation during the Smithian could have generated a high demand for oxidants in the ocean, leading to the expansion of anoxia. Our study provides quantitative constraints on the causal link between the Smithian negative C-isotope excursion and widespread anoxia. The nadir of the Smithian negative C-isotope excursion coincided with the severe loss of biodiversity, suggesting that the expansion of anoxia in response to the transgressive upward movement of anoxic waters may have driven the late Smithian extinction. Hence, it could be one of the causes of the prolonged Early Triassic biotic recovery.
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与中国南方利川（湖北省）巨型鲕滩有关的早三叠世（史密斯期）叠层石：环境及其形成的控制
DOI：
10.1016/j.palaeo.2017.02.006
发表时间：
2017-11
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
Yuheng Fang;Zhong-Qiang Chen;Stephen Kershaw;Yang Li;Mao Luo
通讯作者：
Mao Luo
影响因子：
12.1
作者：
A. Stebbins;T. Algeo;T. Algeo;C. Olsen;H. Sano;H. Rowe;R. Hannigan
通讯作者：
A. Stebbins;T. Algeo;T. Algeo;C. Olsen;H. Sano;H. Rowe;R. Hannigan
DOI：
10.1016/j.palaeo.2006.11.037
发表时间：
2007-08
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
M. Orchard
通讯作者：
M. Orchard
二叠纪-三叠纪过渡期间多次海洋缺氧事件的生物磷灰石地球化学证据以及与二叠纪末灭绝和恢复的联系
影响因子：
5.3
作者：
Song, Haijun;Wignall, Paul B.;Chen, Yanlong
通讯作者：
Chen, Yanlong
影响因子：
2.3
作者：
Grasby, Stephen E.;Beauchamp, Benoit;Sanei, Hamed
通讯作者：
Sanei, Hamed