气候变化领域集成服务门户(CCPortal): Low-Temperature Hydrogen Formation During Aqueous Alteration of Serpentinized Peridotite in the Samail Ophiolite

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DOI	10.1029/2021JB021981
	Low-Temperature Hydrogen Formation During Aqueous Alteration of Serpentinized Peridotite in the Samail Ophiolite
	Ellison E.T.; Templeton A.S.; Zeigler S.D.; Mayhew L.E.; Kelemen P.B.; Matter J.M.; The Oman Drilling Project Science Party
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	Serpentinized peridotite is reacting with groundwater in the subsurface of the Samail ophiolite in Oman. Although these rocks are partially to completely serpentinized, they interact with a groundwater aquifer containing hyperalkaline fluids rich in H2 and CH4. Since the mechanisms by which H2 production may continue at low temperatures (<50°C) are not fully understood, core recovered during the Oman Drilling Project provides an excellent opportunity to study the mineralogy and Fe speciation in highly serpentinized harzburgite recording multiple stages of water/rock interaction. In Hole BA3A, early hydration of olivine and pyroxene, which likely occurred at temperatures of ∼100°C–200°C, produced serpentine, Fe-rich brucite, awaruite, and little magnetite. Notably, Fe-rich brucite is only preserved at >∼100 m depth in the core. Fe-rich brucite is nearly absent within two near-surface reaction zones where later stages of reaction are recorded, which include replacement of Fe-rich brucite by Fe(III)-bearing serpentine, and increases in the proportion of other Fe(III)-bearing phases such as magnetite and hydroandradite. Thus, Fe-rich brucite at depth represents substantial stored capacity for H2 production that can continue at low temperature, even after primary olivine and pyroxene are exhausted, thereby sustaining habitable conditions for microbial life. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	awaruite; brucite; iron redox; low-temperature geochemistry; Samail ophiolite; serpentinization
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/187057
作者单位	Department of Geological Sciences, University of Colorado, Boulder, CO, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; National Oceanography Centre, University of Southampton, Southampton, United Kingdom
推荐引用方式 GB/T 7714	Ellison E.T.,Templeton A.S.,Zeigler S.D.,et al. Low-Temperature Hydrogen Formation During Aqueous Alteration of Serpentinized Peridotite in the Samail Ophiolite[J],2021,126(6).
APA	Ellison E.T..,Templeton A.S..,Zeigler S.D..,Mayhew L.E..,Kelemen P.B..,...&The Oman Drilling Project Science Party.(2021).Low-Temperature Hydrogen Formation During Aqueous Alteration of Serpentinized Peridotite in the Samail Ophiolite.Journal of Geophysical Research: Solid Earth,126(6).
MLA	Ellison E.T.,et al."Low-Temperature Hydrogen Formation During Aqueous Alteration of Serpentinized Peridotite in the Samail Ophiolite".Journal of Geophysical Research: Solid Earth 126.6(2021).