Lithium isotopic constraints on the evolution of continental clay mineral factory and marine oxygenation in the earliest Paleozoic Era
Lithium isotopic constraints on the evolution of continental clay mineral factory and marine oxygenation in the earliest Paleozoic Era
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DOI：
10.1126/sciadv.adk2152
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发表时间：
2024-03
期刊：
影响因子：
13.6
通讯作者：
Guangyi Wei;Mingyu Zhao;Erik A Sperling;Robert R. Gaines;B. Kalderon-Asael;Jun Shen;Chao Li;Feifei Zhang;Gaojun Li;Chuanming Zhou;Chunfang Cai;Daizhao Chen;Ke-Qing Xiao;Lei Jiang;Hong-Fei Ling;N. Planavsky;L. Tarhan
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作者：
Guangyi Wei;Mingyu Zhao;Erik A Sperling;Robert R. Gaines;B. Kalderon-Asael;Jun Shen;Chao Li;Feifei Zhang;Gaojun Li;Chuanming Zhou;Chunfang Cai;Daizhao Chen;Ke-Qing Xiao;Lei Jiang;Hong-Fei Ling;N. Planavsky;L. Tarhan
地球表面上的氧气循环的演变受到分子氧的生产和消耗量之间的平衡仍然有争议的海洋有机碳生产和埋葬如何应对全球环境变化以及这些反馈是否有在此间隔期间，我们报告了跨越上层寒武纪的海洋泥石的全球氧气。 〜525 Ma之后的粘土形成可能与使用全球生物地球化学模型的全球气候变化和整体气候变化有关。加强的连续风化和向海洋的粘土递送可能显着提高了有机碳的埋葬效率，并在最早的古生代海洋中制备了更大的氧气积累。
The evolution of oxygen cycles on Earth’s surface has been regulated by the balance between molecular oxygen production and consumption. The Neoproterozoic–Paleozoic transition likely marks the second rise in atmospheric and oceanic oxygen levels, widely attributed to enhanced burial of organic carbon. However, it remains disputed how marine organic carbon production and burial respond to global environmental changes and whether these feedbacks trigger global oxygenation during this interval. Here, we report a large lithium isotopic and elemental dataset from marine mudstones spanning the upper Neoproterozoic to middle Cambrian [~660 million years ago (Ma) to 500 Ma]. These data indicate a dramatic increase in continental clay formation after ~525 Ma, likely linked to secular changes in global climate and compositions of the continental crust. Using a global biogeochemical model, we suggest that intensified continental weathering and clay delivery to the oceans could have notably increased the burial efficiency of organic carbon and facilitated greater oxygen accumulation in the earliest Paleozoic oceans.