Arid
DOI10.1016/j.precamres.2022.106681
Constraining the redox landscape of Mesoproterozoic mat grounds: A possible oxygen oasis in the 'Boring Billion' seafloor
Jia, Tianyi; Wang, Ruimin; Huang, Tianzheng; Lang, Xianguo; Ma, Haoran; Shen, Bing
通讯作者Shen, B
来源期刊PRECAMBRIAN RESEARCH
ISSN0301-9268
EISSN1872-7433
出版年2022
卷号376
英文摘要The Earth's middle age or the 'Boring Billion' (similar to 1.8 to similar to 0.8 Ga, billion years ago) represents one of the most enigmatic intervals in Earth's history, characterized by the absence of significant carbonate carbon isotope excursions and the sluggish evolution of eukaryotes. It is widely accepted that the atmospheric O-2 level was low (<1% PAL or < 10% PAL) and the ocean remained predominantly anoxic with the development of sulfidic (H2S rich) continental margins. It is suggested that 2-10% of seafloor euxinia was sufficient to deplete some micronutrients in the ocean inventory, such as Mo and Cu, which are essential for nitrogen-fixation for eukaryotes. However, recent studies report multicellular fossils and episodic/sporadic inception of oceanic oxidation in Mesoproterozoic. These findings imply the possible occurrences of oxygen oasis that provided habitable niches for eukaryote evolution. Such oxygen oasis likely developed at shallow marine seafloor covered with microbial mat, where O-2 produced by benthic cyanobacteria resulted in the oxygenation of seafloor. Therefore, in order to constrain the habitability of Mesoproterozoic oxygen oasis, it is essential to reconstruct the O-2 fugacity in the seafloor. In this study, we analyzed pyrite sulfur isotopes and pyrite contents of the Mesoproterozoic Wumishan Formation (similar to 1.4 Ga). The Wumishan Formation is composed of cyclic deposition of, in a shoaling upward sequence, the subtidal calcareous shale, massive thrombolitic dolostone, and microbial laminated dolostone. Both microbial laminated dolostone and thrombolytic dolostone precipitation involved with microbial activities, and thus might record the redox condition of putative oxygen oasis in the Mesoproterozoic oceans. We apply the One-Dimensional Diffusion-Advection-Reaction (1D-DAR) model to simulate diagenetic pyrite formation in sediments. Sedimentation rate can be well constrained by the depositional cycles of the Wumishan Formation. The modelling results indicate that more than 60 similar to 80% of H2S that was generated in microbial sulfate reduction (MSR) was reoxidized, and that organic matter supply, both from surface water and seafloor, was limited. Thus, our study indicates that the seafloor could be substantially oxygenated in Mesoproterozoic, even when the atmospheric O-2 level was extremely low. Shallow marine seafloor covered with microbial mat may function as the oxygen oasis, providing habitable niches for the evolution of eukaryotes.
英文关键词Pyrite Sulfur isotope DAR model Wumishan formation North China
类型Article
语种英语
收录类别SCI-E
WOS记录号WOS:000832989300002
WOS关键词SULFUR ISOTOPE FRACTIONATION ; THERMOCHEMICAL SULFATE REDUCTION ; LOW ATMOSPHERIC OXYGEN ; OCEAN OXYGENATION ; FERRUGINOUS CONDITIONS ; PROTEROZOIC SEAWATER ; WUMISHAN FORMATION ; JIXIAN SECTION ; BENTHIC IRON ; EVOLUTION
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/394071
推荐引用方式
GB/T 7714
Jia, Tianyi,Wang, Ruimin,Huang, Tianzheng,et al. Constraining the redox landscape of Mesoproterozoic mat grounds: A possible oxygen oasis in the 'Boring Billion' seafloor[J],2022,376.
APA Jia, Tianyi,Wang, Ruimin,Huang, Tianzheng,Lang, Xianguo,Ma, Haoran,&Shen, Bing.(2022).Constraining the redox landscape of Mesoproterozoic mat grounds: A possible oxygen oasis in the 'Boring Billion' seafloor.PRECAMBRIAN RESEARCH,376.
MLA Jia, Tianyi,et al."Constraining the redox landscape of Mesoproterozoic mat grounds: A possible oxygen oasis in the 'Boring Billion' seafloor".PRECAMBRIAN RESEARCH 376(2022).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Jia, Tianyi]的文章
[Wang, Ruimin]的文章
[Huang, Tianzheng]的文章
百度学术
百度学术中相似的文章
[Jia, Tianyi]的文章
[Wang, Ruimin]的文章
[Huang, Tianzheng]的文章
必应学术
必应学术中相似的文章
[Jia, Tianyi]的文章
[Wang, Ruimin]的文章
[Huang, Tianzheng]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。