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

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

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An increase in atmospheric pO2 has been proposed as a trigger for the Cambrian Explosion at～539-514 Ma but the mechanistic linkage remains unclear.To 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 China.The δ138Baexcess values vary within a large range and show a negative logarithmic correlation with Baexcess,suggesting a major(＞99％)drawdown of oceanic Ba inventory via barite precipitation.Spatial variations in Baexcess and δ138Baexcess indicate that Ba removal was driven by sulfate availability that was ultimately derived from the upwelling of deep seawaters.Global 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 precipitation.The removal of both H2S and Ba that are deleterious to animals could have improved marine habitability for early animals.

early Cambriananimals radiationsulfate availabilitybarite precipitationtoxic material removal

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

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State Key Laboratory of Lithospheric and Environmental Coevolution,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China

CAS Center for Excellence in Comparative Planetology,University of Science and Technology of China,Hefei 230026,China

Department of Geosciences,Virginia Tech,Blacksbrug 24061,USA

State Key Laboratory for Mineral Deposits Research,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China

School of Earth Sciences and Resources, China University of Geoscience, Beijing 100083, China

Deep Space Exploration Lab/School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China

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National Key Research and Development Program of ChinaStrategic Priority Research Program(B)of the Chinese Academy of SciencesNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaUS National Science Foundation

2021YFA0718200XDB410000004197207242373056EAR-2021207

2024

10.1093/nsr/nwae237

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ISSN：
年,卷(期)：2024.11(8)
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