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Seawater barium and sulfide removal improved marine habitability for the Cambrian Explosion of early animals

National Science Review 2024年第8期11卷 136-145页

作者： Wei Wei Lin-Hui Dong Shuhai Xiao Yi-Bo Lin Lingang Xu Guang-Yi Wei Wenzhong Wang Lan-Lan Tian Hai-Zhen Wei Fang Huang State Key Laboratory of Lithospheric and Environmental Coevolution School of Earth and Space Sciences University of Science and Technology of China CAS Center for Excellence in Comparative Planetology University of Science and Technology of China Department of Geosciences Virginia Tech State Key Laboratory for Mineral Deposits Research School of Earth Sciences and Engineering Nanjing University School of Earth Sciences and Resources China University of Geoscience Deep Space Exploration Lab School of Earth and Space SciencesUniversity of Science and Technology of China

An increase in atmospheric pO2has been proposed as a trigger for the Cambrian Explosion at ～539-514 Ma but the mechanistic linkage remains *** gain insights into marine habitability for the Cambrian Explosion,we analysed excess Ba contents(Baexcess) and isotope compositions(δ138Baexcess) of～521-Myr-old metalliferous black shales in South *** δ138Baexcessvalues vary within a large range and show a negative logarithmic correlation with Baexcess,suggesting a major（>99%） drawdown of oceanic Ba inventory via barite *** variations in Baexcessand δ138Baexcessindicate that Ba removal was driven by sulfate availability that was ultimately derived from the upwelling of deep *** oceanic oxygenation across the Ediacaran-Cambrian transition may have increased the sulfate reservoir via oxidation of sulfide and concurrently decreased the Ba reservoir by barite *** removal of both H2S and Ba that are deleterious to animals could have improved marine habitability for early animals.

关键词： early Cambrian animals radiation sulfate availability barite precipitation toxic material removal

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