globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2671
论文题名:
Fault-controlled hydration of the upper mantle during continental rifting
作者: Bayrakci G.; Minshull T.A.; Sawyer D.S.; Reston T.J.; Klaeschen D.; Papenberg C.; Ranero C.; Bull J.M.; Davy R.G.; Shillington D.J.; Perez-Gussinye M.; Morgan J.K.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:5
起始页码: 384
结束页码: 388
语种: 英语
Scopus关键词: active fault ; continental margin ; deformation mechanism ; fault displacement ; hydrothermal system ; magmatism ; mid-ocean ridge ; peridotite ; rifting ; seafloor ; seawater ; seismic tomography ; serpentinite ; serpentinization ; subduction zone ; upper mantle ; Spain
英文摘要: Water and carbon are transferred from the ocean to the mantle in a process that alters mantle peridotite to create serpentinite and supports diverse ecosystems. Serpentinized mantle rocks are found beneath the sea floor at slow-to ultraslow-spreading mid-ocean ridges and are thought to be present at about half the world's rifted margins. Serpentinite is also inferred to exist in the downgoing plate at subduction zones, where it may trigger arc magmatism or hydrate the deep Earth. Water is thought to reach the mantle via active faults. Here we show that serpentinization at the rifted continental margin offshore from western Spain was probably initiated when the whole crust cooled to become brittle and deformation was focused along large normal faults. We use seismic tomography to image the three-dimensional distribution of serpentinization in the mantle and find that the local volume of serpentinite beneath thinned, brittle crust is related to the amount of displacement along each fault. This implies that sea water reaches the mantle only when the faults are active. We estimate the fluid flux along the faults and find it is comparable to that inferred for mid-ocean ridge hydrothermal systems. We conclude that brittle processes in the crust may ultimately control the global flux of sea water into the Earth. © 2016 Macmillan Publishers Limited. 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/106009
Appears in Collections:气候减缓与适应
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作者单位: University of Southampton, Ocean and Earth Science, National Oceanography Centre Southampton, Southampton, United Kingdom; Rice University, Department of Earth Science, Houston, TX, United States; University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, United Kingdom; GEOMAR, Helmholtz Centre for Ocean Research Kiel, Marine Geodynamics, Kiel, Germany; ICREA, CSIC, Barcelona Centre for Subsurface Imaging, Instituto de Ciencias Del Mar, Barcelona, Spain; Lamont-Doherty Earth Observatory of Columbia University, Marine Geophysics, Palisades, NY, United States; MARUM, Centre for Marine Environmental Sciences, Bremen University, Bremen, Germany; Royal Holloway University of London, Department of Earth Sciences, Egham, Surrey, United Kingdom

Recommended Citation:
Bayrakci G.,Minshull T.A.,Sawyer D.S.,et al. Fault-controlled hydration of the upper mantle during continental rifting[J]. Nature Geoscience,2016-01-01,9(5)
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