气候变化领域集成服务门户(CCPortal): Sulfide Dissolution and Awaruite Formation in Continental Serpentinization Environments and Its Implications to Supporting Life

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DOI	10.1029/2021JB021758
	Sulfide Dissolution and Awaruite Formation in Continental Serpentinization Environments and Its Implications to Supporting Life
	Schwarzenbach E.M.; Vrijmoed J.C.; Engelmann J.M.; Liesegang M.; Wiechert U.; Rohne R.; Plümper O.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Serpentinization environments are key locations that support microbial communities by the abiogenic formation of reduced species associated with peridotite alteration. Here we studied partially serpentinized peridotites from the Chimaera seeps (Turkey), an active continental serpentinization system that vents highly methane-rich fluids, to investigate the impact of water-rock interaction on the sulfide and metal mineralogy and its implications on supporting microbial communities. Using high-resolution scanning electron microscopy, electron microprobe analysis, and transmission electron microscopy we found diverse pentlandite decomposition features with precipitation of secondary sulfides including millerite, heazlewoodite, as well as Cu-bearing sulfides, native Cu, and awaruite (Ni3Fe). Awaruite forms dense veinlets to single crystal platelets tens of nanometers in size, which is formed by desulphurization of pentlandite. In addition, the nanometer-sized awaruite platelets are intimately intergrown with serpentine suggesting its growth during peridotite alteration by a dissolution-precipitation process, likely associated with the interaction of methane- and H2-rich but highly sulfur-undersaturated fluids. Based on sulfur isotope signatures we infer a mantle and mid-ocean ridge origin of the sulfide minerals associated with the first stage of partial serpentinization and awaruite formation. Subsequent and ongoing continental fluid-rock interaction causes significant sulfide decomposition resulting in the formation of porosity and the release of, amongst others, H2S and Fe. These species may likely provide a source of nutrients for active microbial communities in these comparatively nutrient-starved, low-temperature continental serpentinization environments. © 2021. The Authors.
英文关键词	awaruite; Chimaera; mineral dissolution; nanoscale; serpentinization; water-rock interaction
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187110
作者单位	Institute of Geological Sciences, Freie Universität Berlin, Berlin, Germany; Department of Earth Sciences, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Schwarzenbach E.M.,Vrijmoed J.C.,Engelmann J.M.,et al. Sulfide Dissolution and Awaruite Formation in Continental Serpentinization Environments and Its Implications to Supporting Life[J],2021,126(5).
APA	Schwarzenbach E.M..,Vrijmoed J.C..,Engelmann J.M..,Liesegang M..,Wiechert U..,...&Plümper O..(2021).Sulfide Dissolution and Awaruite Formation in Continental Serpentinization Environments and Its Implications to Supporting Life.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Schwarzenbach E.M.,et al."Sulfide Dissolution and Awaruite Formation in Continental Serpentinization Environments and Its Implications to Supporting Life".Journal of Geophysical Research: Solid Earth 126.5(2021).