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

IF 16.3 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES National Science Review Pub Date : 2024-07-08 DOI:10.1093/nsr/nwae237
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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Abstract

An increase in atmospheric pO2 has been proposed as a trigger of the Cambrian Explosion at ∼539–514 Ma, but the mechanistic linkage remains unclear. To gain insights into marine habitability for the Cambrian Explosion, we analyzed 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 Ba removal was driven by sulfate availability 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.
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海水钡和硫化物的去除改善了寒武纪早期动物大爆发的海洋适居性
大气中 pO2 的增加被认为是 539-514 Ma ∼寒武纪大爆发的导火索,但其机理联系仍不清楚。为了深入了解寒武纪大爆发的海洋适居性,我们分析了华南地区521百万年前的含金属黑色页岩中过量的钡含量(Baexcess)和同位素组成(δ138Baexcess)。δ138Baexcess值在很大范围内变化,并与Baexcess呈负对数相关,表明通过重晶石沉淀,大洋Ba储量大量减少(>99%)。Baexcess 和 δ138Baexcess 的空间变化表明,钡的去除是由硫酸盐驱动的,硫酸盐最终来自深海海水的上涌。埃迪卡拉-寒武纪过渡时期的全球海洋含氧量可能通过硫化物的氧化作用增加了硫酸盐储量,同时通过重晶石沉淀减少了钡储量。去除对动物有害的 H2S 和 Ba 可以改善早期动物在海洋中的生存环境。
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来源期刊
National Science Review
National Science Review MULTIDISCIPLINARY SCIENCES-
CiteScore
24.10
自引率
1.90%
发文量
249
审稿时长
13 weeks
期刊介绍: National Science Review (NSR; ISSN abbreviation: Natl. Sci. Rev.) is an English-language peer-reviewed multidisciplinary open-access scientific journal published by Oxford University Press under the auspices of the Chinese Academy of Sciences.According to Journal Citation Reports, its 2021 impact factor was 23.178. National Science Review publishes both review articles and perspectives as well as original research in the form of brief communications and research articles.
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