Hg isotope evidence for oceanic oxygenation during the Cambrian Explosion

doi:10.1016/j.gca.2023.10.020

NIGPAS OpenIR

	Hg isotope evidence for oceanic oxygenation during the Cambrian Explosion
通讯作者	Fan, Haifeng([email protected])
	Fan, Haifeng 1,6; Fu, Xuewu 2,6; Yang, Ruofei 1,6; Wen, Hanjie 3,6; Hu, Chunlin 4; Ward, Jack F.5; Zhang, Hongjie 1,6; Zhang, Hui 2,6; Zhang, Xingliang 7
	2023-12-01
发表期刊	GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN	0016-7037
卷号	362 页码:104-114
摘要	The Cambrian explosion is a critical evolutionary milestone in life history, but the mechanistic relationship between the Cambrian explosion, rising atmospheric and oceanic oxygen levels, and the primary productivity remains controversial. Here, we present new mercury (Hg) isotope data from Cambrian marine sediments of the similar to 521-514 Ma Yu'anshan and Shuijingtuo Formations (Nanhua Basin, South China), which preserve the famous similar to 518 Ma Chengjiang and Qingjiang Cambrian Biotas, respectively. We find evidence that, prior to Cambrian animal diversification, local terrestrial and/or atmospheric inputs are important drivers of Hg enrichment in the shallow shelf Yu'anshan and Shuijintuo Formations. Elevated Hg and total organic carbon (TOC) concentrations of coeval deeper shelf and slope sections of the Niutitang Formation are mainly attributed to upwelling of Hg associated with dissolved organic carbon (Hg-DOC) from pelagic seawater, unrelated to locally high primary productivity. During the deposition of fossiliferous strata, negative shifts of Delta Hg-199 and delta Hg-202 values in the shallow water shelf shales from the Shuijingtuo Formation, combined with similar Hg isotope characteristics in the deeper shelf and slope shales, demonstrate a significant shallow and deep-water oxygenation event took place in the Nanhua Basin. A comparable negative shift of Delta Hg-199 values occurs in coeval Indian Craton sediments, suggesting this oxygenation event could be regional, or possibly even global, in scale. Our newly-collected Hg isotope data provide strong evidence that rising molecular oxygen levels in both surface and deep seawater are associated with enhanced marine primary productivity and could be a critical driver of the Cambrian explosion. Finally, we also argue that Hg isotopes are an emerging and promising redox proxy for studies of Precambrian seawater, but the chemical response of Hg to atmospheric and ocean oxygenation requires further calibration.
关键词	Cambrian explosion Hg isotope Increased oxygen levels
DOI	10.1016/j.gca.2023.10.020
收录类别	SCI
语种	英语
关键词[WOS]	SOUTH CHINA ; ANIMAL EVOLUTION ; MERCURY ISOTOPES ; BLACK SHALES ; ELEMENTAL MERCURY ; FRACTIONATION ; OXIDATION ; BIOTA ; ENRICHMENT ; SIGNATURES
资助项目	NSFC[41890841] ; NSFC[U1812402] ; NSFC[42073016] ; NSFC[92062221] ; NSFC[42121003] ; CAS[ZDBS-LY-DQC029] ; Guizhou Provincial 2020 Science and Technology Subsides[GZ2020SIG]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001107378200001
项目资助者	NSFC ; CAS ; Guizhou Provincial 2020 Science and Technology Subsides
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/43163
专题	中国科学院南京地质古生物研究所
通讯作者	Fan, Haifeng
作者单位	1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China 2.Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China 3.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China 4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 5.Univ Queensland, Sch Environm, Brisbane, Qld 4072, Australia 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 7.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Shaanxi Key Lab Early Life & Environm, Xian 710069, Peoples R China
推荐引用方式 GB/T 7714	Fan, Haifeng,Fu, Xuewu,Yang, Ruofei,et al. Hg isotope evidence for oceanic oxygenation during the Cambrian Explosion[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2023,362:104-114.
APA	Fan, Haifeng.,Fu, Xuewu.,Yang, Ruofei.,Wen, Hanjie.,Hu, Chunlin.,...&Zhang, Xingliang.(2023).Hg isotope evidence for oceanic oxygenation during the Cambrian Explosion.GEOCHIMICA ET COSMOCHIMICA ACTA,362,104-114.
MLA	Fan, Haifeng,et al."Hg isotope evidence for oceanic oxygenation during the Cambrian Explosion".GEOCHIMICA ET COSMOCHIMICA ACTA 362(2023):104-114.