干旱区生态环境知识资源中心(Arid): Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas

Arid

DOI	10.1016/j.precamres.2022.106902
	Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas
	Riding, Robert; Liang, Liyuan; Fralick, Philip
通讯作者	Riding, R
来源期刊	PRECAMBRIAN RESEARCH
ISSN	0301-9268
EISSN	1872-7433
出版年	2022
卷号	383
英文摘要	The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms,-2.9-2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin pre-cipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an 'Oxygen Oasis'. In this system, Fe2+, at -3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Plat-form margin chemoclines created by oxygen production likely persisted throughout the Archean.
英文关键词	Archean Canada Carbonate Oxygenation Seawater
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000891765600002
WOS关键词	IRON-FORMATION DEPOSITION ; LAKE GREENSTONE-BELT ; EARTH-ELEMENT GEOCHEMISTRY ; WESTERN SUPERIOR PROVINCE ; STEEP ROCK GROUP ; TRANSVAAL SUPERGROUP ; SEAWATER CHEMISTRY ; SECULAR VARIATION ; NORTHWESTERN ONTARIO ; WABIGOON SUBPROVINCE
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/2XILL650/394072
推荐引用方式 GB/T 7714	Riding, Robert,Liang, Liyuan,Fralick, Philip. Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas[J],2022,383.
APA	Riding, Robert,Liang, Liyuan,&Fralick, Philip.(2022).Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas.PRECAMBRIAN RESEARCH,383.
MLA	Riding, Robert,et al."Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas".PRECAMBRIAN RESEARCH 383(2022).