四川东北部瓜达鲁普末期海相氧化还原演化与有机质聚集

IF 2.6 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Xiaotong Ge , Baojian Shen , Daizhao Chen , Yali Liu , Ziwen Jiang , Mu Liu , Xun Ge
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引用次数: 0

摘要

Guadalupian-Lopingian (G-L)过渡是一个关键的间歇期,在此期间海洋氧化还原条件的变化被认为与guadalupian末期的大灭绝有关。然而,海洋氧化还原态的详细时空变化仍不明确。为探索海洋同步移动及其控制有机质富集的因素,采用有机碳同位素、总有机碳含量、铁形态含量、汞含量、主微量元素含量等地球化学指标,对四川盆地东北部陆架内盆地G-L边界的富有机质演替进行了研究。我们的研究结果根据Fe-Mo-U-V数据描绘了四个不同的氧化还原条件间隔(I-IV),显示了从亚氧到含铁,其次是缺氧,然后返回亚氧条件的顺序。中生期似乎是由高度受限的盆地环境和频繁的火山活动共同驱动的。此外,初级生产力在II2段达到峰值,这可能是有机质积累的关键因素。与其他地区的对比分析表明,古特提斯系在瓜德鲁普末期比Panthalassa缺氧和停滞更严重,二叠纪-三叠纪的缺氧严重程度超过了G-L过渡时期。总体而言,显著的海洋缺氧局限于中等深度,不同区域的发生时间不同,而在远洋盆地中明显不存在。这种模式意味着缺氧可能不是大灭绝事件的主要原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Marine redox evolution and organic matter accumulation in the end Guadalupian in NE Sichuan, South China
The Guadalupian-Lopingian (G-L) transition represents a pivotal interval, during which changes in oceanic redox conditions have been proposed to correlate with the end-Guadalupian mass extinction. However, the detailed spatial and temporal variations in marine redox states are still not well-defined. To explore the concurrent oceanic shifts and the factors controlling organic matter accumulation, we investigate an organic-rich succession from the G-L boundary located in an intrashelf basin in the northeastern Sichuan Basin, Southwest China by means of multiple geochemical indicators, including organic carbon isotope, total organic carbon contents, iron speciation contents, mercury contents and major and trace elements contents. Our results delineate four distinct intervals (I-IV) of redox conditions based on Fe-Mo-U-V data, showing a sequence from suboxic to ferruginous, followed by euxinic, and returning to suboxic conditions. The euxinic phase appears to have been driven by a highly restricted basin environment combined with frequent volcanic episodes. Additionally, the primary productivity peaked in the Interval II2, which may have been a key factor in the organic matter accumulation. Comparative analysis with studies from other regions indicates that the Paleo-Tethys was more anoxic and exhibited greater stagnation than the Panthalassa during the end-Guadalupian, with the severity of anoxia during the Permian-Triassic transition surpassing that of the G-L transition. Overall, the significant marine anoxia was confined to moderate depths, with varying onset times across different areas, and was notably absent in the pelagic basins. This pattern implies that anoxia might not have been the primary cause of the mass extinction event.
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来源期刊
CiteScore
5.90
自引率
10.00%
发文量
398
审稿时长
3.8 months
期刊介绍: Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.
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