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DOI | 10.1073/pnas.1907871116 |
Abiotic methane synthesis and serpentinization in olivine-hosted fluid inclusions | |
Klein, Frieder1; Grozeva, Niya G.2; Seewald, Jeffrey S.1 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:36页码:17666-17672 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The conditions of methane (CH4) formation in olivine-hosted secondary fluid inclusions and their prevalence in peridotite and gabbroic rocks from a wide range of geological settings were assessed using confocal Raman spectroscopy, optical and scanning electron microscopy, electron microprobe analysis, and thermodynamic modeling. Detailed examination of 160 samples from ultraslow-to fast-spreading midocean ridges, subduction zones, and ophiolites revealed that hydrogen (H-2) and CH4 formation linked to serpentinization within olivine-hosted secondary fluid inclusions is a widespread process. Fluid inclusion contents are dominated by serpentine, brucite, and magnetite, as well as CH4(g) and H-2(g) in varying proportions, consistent with serpentinization under strongly reducing, closed-system conditions. Thermodynamic constraints indicate that aqueous fluids entering the upper mantle or lower oceanic crust are trapped in olivine as secondary fluid inclusions at temperatures higher than similar to 400 degrees C. When temperatures decrease below similar to 340 degrees C, serpentinization of olivine lining the walls of the fluid inclusions leads to a near-quantitative consumption of trapped liquid H2O. The generation of molecular H-2 through precipitation of Fe(III)-rich daughter minerals results in conditions that are conducive to the reduction of inorganic carbon and the formation of CH4. Once formed, CH4(g) and H-2(g) can be stored over geological timescales until extracted by dissolution or fracturing of the olivine host. Fluid inclusions represent a widespread and significant source of abiotic CH4 and H-2 in submarine and subaerial vent systems on Earth, and possibly elsewhere in the solar system. |
英文关键词 | abiotic methane fluid inclusions serpentinization methane seeps carbon cycling |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000485140300018 |
WOS关键词 | MID-OCEAN RIDGES ; COMPOSITIONAL CONTROLS ; ULTRAMAFIC ROCKS ; VENT FLUIDS ; GEOCHEMISTRY ; EVOLUTION ; OPHIOLITE ; HYDROGEN ; SYSTEMS ; ORIGIN |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205170 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA; 2.Massachusetts Inst Technol Woods Hole Oceanog Ins, Cambridge, MA 02139 USA |
推荐引用方式 GB/T 7714 | Klein, Frieder,Grozeva, Niya G.,Seewald, Jeffrey S.. Abiotic methane synthesis and serpentinization in olivine-hosted fluid inclusions[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(36):17666-17672. |
APA | Klein, Frieder,Grozeva, Niya G.,&Seewald, Jeffrey S..(2019).Abiotic methane synthesis and serpentinization in olivine-hosted fluid inclusions.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(36),17666-17672. |
MLA | Klein, Frieder,et al."Abiotic methane synthesis and serpentinization in olivine-hosted fluid inclusions".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.36(2019):17666-17672. |
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