DOI: 10.1038/ngeo2878
论文题名: A key role for green rust in the Precambrian oceans and the genesis of iron formations
作者: Halevy I. ; Alesker M. ; Schuster E.M. ; Popovitz-Biro R. ; Feldman Y.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 2 起始页码: 135
结束页码: 139
语种: 英语
Scopus关键词: biogeochemical cycle
; environmental conditions
; iron
; iron oxide
; Precambrian
; precipitation (chemistry)
; salt
; seawater
; water column
英文摘要: Iron formations deposited in marine settings during the Precambrian represent large sinks of iron and silica, and have been used to reconstruct environmental conditions at the time of their formation. However, the observed mineralogy in iron formations, which consists of iron oxides, silicates, carbonates and sulfides, is generally thought to have arisen from diagenesis of one or more mineral precursors. Ferric iron hydroxides and ferrous carbonates and silicates have been identified as prime candidates. Here we investigate the potential role of green rust, a ferrous-ferric hydroxy salt, in the genesis of iron formations. Our laboratory experiments show that green rust readily forms in early seawater-analogue solutions, as predicted by thermodynamic calculations, and that it ages into minerals observed in iron formations. Dynamic models of the iron cycle further indicate that green rust would have precipitated near the iron redoxcline, and it is expected that when the green rust sank it transformed into stable phases within the water column and sediments. We suggest, therefore, that the precipitation and transformation of green rust was a key process in the iron cycle, and that the interaction of green rust with various elements should be included in any consideration of Precambrian biogeochemical cycles. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105850
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel; Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel
Recommended Citation:
Halevy I.,Alesker M.,Schuster E.M.,et al. A key role for green rust in the Precambrian oceans and the genesis of iron formations[J]. Nature Geoscience,2017-01-01,10(2)