Intense intrusion of low-oxygen waters into mid-Cambrian surface ocean carbonate factories

doi:10.1016/j.chemgeo.2024.122360

NIGPAS OpenIR

	Intense intrusion of low-oxygen waters into mid-Cambrian surface ocean carbonate factories
通讯作者	Li, Fei([email protected])
	Li, Yang-fan 1; Li, Fei 1; Webb, Gregory E.2; Chen, Jitao3,4
	2024-12-05
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	669 页码:15
摘要	The Phanerozoic surface ocean is characterized by its high dissolved oxygen content owing to mixing with the atmosphere. However, atmospheric oxygen levels varied in the early Paleozoic and it remains unclear whether the surface ocean was susceptible to significant redox fluctuations in response to extreme environmental events. In this study, we probed the redox structures of shallow middle Cambrian marine depositional environments across the North China Platform, ranging from open tidal flats to relatively deep subtidal environments. We utilized a combination of least diagenetically altered carbonate materials (such as ooid cortices, calcimicrobes, and their fringing cements), as well as in situ element measurement and imaging techniques. By analyzing a set of redox-related elements (e.g., Ce anomaly, Zn/Fe molar ratio, Mn and Cr) and mineralogical proxies (hydrogenetic Fe oxides), we revealed a stratified redox structure in the Drumian surface oceans. Compared to earlier Drumian conditions, late Drumian surface oceans experienced significant intrusions of ferruginous waters, probably reaching into shallow subtidal environments with water depths less than 10 m. Furthermore, we identified shallow subtidal microbial O-2-producing factories, characterized by dendritic Epiphyton thalli. These calcimicrobes exhibited more oxygenated signatures (negative Ce anomalies and enrichment of hydrogenetic Fe oxides) relative to contemporaneous less oxic shallower and deeper environments. This finding indicates that they produced oxygen oases or refuges during periods of both normal and poor dissolved O-2 conditions. This study has the potential to broaden our understanding of redox conditions and microbial oxygen-producing mechanisms in the surface ocean, particularly during intervals characterized by low atmospheric oxygen levels or episodic anoxic events.
关键词	LA-ICP-(TOF)-MS Redox structure Rare earth elements Microbial O (2) -producing factories
DOI	10.1016/j.chemgeo.2024.122360
收录类别	SCI
语种	英语
关键词[WOS]	RARE-EARTH-ELEMENTS ; REEFAL CARBONATES ; SEAWATER ; ORDOVICIAN ; YTTRIUM ; GEOCHEMISTRY ; STRATIGRAPHY ; CHEMISTRY ; PATTERNS ; ARCHIVES
资助项目	Natural Science Foundation of China[42172136] ; Natural Science Foundation of China[41872119]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001310700800001
项目资助者	Natural Science Foundation of China
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44289
专题	中国科学院南京地质古生物研究所
通讯作者	Li, Fei
作者单位	1.Southwest Petr Univ, Sch Geosci & Technol, Chengdu 610500, Peoples R China 2.Univ Queensland, Sch Environm, Brisbane, Qld 4072, Australia 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 4.Chinese Acad Sci, Ctr Excellence Life & Palaeoenvironm, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Li, Yang-fan,Li, Fei,Webb, Gregory E.,et al. Intense intrusion of low-oxygen waters into mid-Cambrian surface ocean carbonate factories[J]. CHEMICAL GEOLOGY,2024,669:15.
APA	Li, Yang-fan,Li, Fei,Webb, Gregory E.,&Chen, Jitao.(2024).Intense intrusion of low-oxygen waters into mid-Cambrian surface ocean carbonate factories.CHEMICAL GEOLOGY,669,15.
MLA	Li, Yang-fan,et al."Intense intrusion of low-oxygen waters into mid-Cambrian surface ocean carbonate factories".CHEMICAL GEOLOGY 669(2024):15.