globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2865
论文题名:
Fluid escape from subduction zones controlled by channel-forming reactive porosity
作者: Plümper O.; John T.; Podladchikov Y.Y.; Vrijmoed J.C.; Scambelluri M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:2
起始页码: 150
结束页码: 156
语种: 英语
Scopus关键词: channel flow ; channelization ; dehydration ; fluid flow ; fluid pressure ; high pressure ; metamorphism ; oceanic lithosphere ; porosity ; serpentinite ; slab ; subduction zone ; vein (geology)
英文摘要: Water within the oceanic lithosphere is returned to Earth's surface at subduction zones. Observations of metamorphosed veins preserved in exhumed slabs suggest that fluid can escape via channel networks. Yet, it is unclear how such channels form that allow chemically bound water to escape the subducting slab as the high pressures during subduction reduce the porosity of rocks to nearly zero. Here we use multiscale rock analysis combined with thermodynamic modelling to show that fluid flow initiation in dehydrating serpentinites is controlled by intrinsic chemical heterogeneities, localizing dehydration reactions at specific microsites. Porosity generation is directly linked to the dehydration reactions and resultant fluid pressure variations force the reactive fluid release to organize into vein networks across a wide range of spatial scales (μm to m). This fluid channelization results in large-scale fluid escape with sufficient fluxes to drain subducting plates. Moreover, our findings suggest that antigorite dehydration reactions do not cause instantaneous rock embrittlement, often presumed as the trigger of intermediate-depth subduction zone seismicity. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105852
Appears in Collections:气候减缓与适应
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作者单位: Department of Earth Sciences, Utrecht University, Budapestlaan 4, Utrecht, Netherlands; Physics of Geological Processes (PGP), University of Oslo, Blindern, Oslo, Norway; Institut für Geologische Wissenschaften, Freie Universität Berlin, Malteserstrasse 74-100, Berlin, Germany; Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland; Department of Earth Sciences, Swiss Federal Institute of Technology Zürich, Sonneggstrasse 5, Zürich, Switzerland; Dipartimento di Scienze della Terra, Ambiente e Vita, Università di Genova, Corso Europa 26, Genova, Italy

Recommended Citation:
Plümper O.,John T.,Podladchikov Y.Y.,et al. Fluid escape from subduction zones controlled by channel-forming reactive porosity[J]. Nature Geoscience,2017-01-01,10(2)
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