Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran

doi:10.1029/2018JC014068

GIG OpenIR

	Fan, Haifeng 1; Wen, Hanjie 1,2; Xiao, Chaoyi 1,2; Zhou, Ting 1; Cloquet, Christophe 3; Zhu, Xiangkun 4
	Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN号	2169-9275
	2018-08-01
卷号	123 期号:8 页码:5248-5260
DOI	10.1029/2018JC014068
语种	英语
WOS研究方向	Oceanography
摘要	During the early Ediacaran, there was a large influx of phosphorus into the oceans and a resultant high phosphorus concentration in seawater, where multicellular eukaryotes may have been the primary type of marine productivity. The eukaryotes could play a critical role in regulating Zn cycling and isotopes. To establish Zn geochemical cycling patterns in the phosphorus-rich ocean, this study investigates Zn isotopic signatures of shallow water phosphorite that contains phosphatized microfossils (Weng'an biota) and deep-water shale from the Doushantuo Formation. Our results indicate that phosphorite commonly preserves heavier Zn isotope composition, with an average of 0.80. The positive Zn-66 values in phosphorites may be ascribed to Zn isotope fractionation associated with the complexation of Zn with phosphate and the adsorption of isotopically heavy Zn onto Fe-Mn oxides and organism's surfaces. We argue that phosphorite may represent an important sink of isotopically heavy Zn in a phosphorus-rich ocean during Earth history. Meanwhile, deep-water organic-rich shale shows an enrichment of isotopically light Zn with an average of 0.23, which may be attributed to sulfide precipitation in mid-depth environment. The organic-rich shale may represent an isotopically light Zn sink. In addition, the highest Zn-66 value (0.45) in a euxinic black shale may indicate that Zn isotope signal of anoxic deep water is similar to that of modern deep seawater. If that is the case, it suggests that Zn geochemical cycling in the early Ediacaran oceans was similar to that of modern oceans.
关键词	zinc geochemical cycling Zn isotopes phosphorus-rich ocean early Ediacaran south China
WOS记录号	WOS:000445188900012
收录类别	SCI
引用统计
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/39941
通讯作者	Fan, Haifeng
作者单位	1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang, Guizhou, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 3.Ctr Rech Petrog & Geochim, Vandoeuvre Les Nancy, France 4.Chinese Acad Geol Sci, Inst Geol, MNR Key Lab Isotope Geol, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Fan, Haifeng,Wen, Hanjie,Xiao, Chaoyi,et al. Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2018,123(8):5248-5260.
APA	Fan, Haifeng,Wen, Hanjie,Xiao, Chaoyi,Zhou, Ting,Cloquet, Christophe,&Zhu, Xiangkun.(2018).Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,123(8),5248-5260.
MLA	Fan, Haifeng,et al."Zinc Geochemical Cycling in a Phosphorus-Rich Ocean During the Early Ediacaran".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 123.8(2018):5248-5260.