Results 161 to 170 of about 1,920 (208)
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Geochimica Et Cosmochimica Acta, 2021
Abstract Serpentinite is one of the most important sources of volatiles and fluid-mobile elements in subduction zones. Attempts have been made to discriminate serpentinite-derived fluid from other sources (e.g., sediments, altered oceanic crusts) using a variety of geochemical tools, but such differentiation has proven to be changeling because fluids
Ji Shen, Shui-Jiong Wang, Liping Qin
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Abstract Serpentinite is one of the most important sources of volatiles and fluid-mobile elements in subduction zones. Attempts have been made to discriminate serpentinite-derived fluid from other sources (e.g., sediments, altered oceanic crusts) using a variety of geochemical tools, but such differentiation has proven to be changeling because fluids
Ji Shen, Shui-Jiong Wang, Liping Qin
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Journal of Geodynamics, 2016 International audienceThe lithological nature of major interplate boundaries is estimated by a field analysis of a well preserved exhumed subduction channel in the Caucasus Karabakh region.
Marc Hässig +2 more
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The maximum depth of the subduction channel in modern subduction zones
2022<p>The subduction channel is located directly above a downgoing oceanic plate and forms by dehydration of this plate. The ascending water-rich fluids react with the mantle to hydrous minerals such as chlorite and amphibole. This process rheologically weakens the mantle and reduces its density so that an upwards-directed mass flow is ...
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Pure and Applied Geophysics, 1988
The subduction-channel model predicts five geologically and geophysically distinctive types of convergent plate margin. They differ primarily in the proportions of incoming sediment and upflowing melange offscraped and underplated near the toe of the overriding block. The model predicts complex patterns of uplift or subsidence of the forearc region due
Mark Cloos
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The subduction-channel model predicts five geologically and geophysically distinctive types of convergent plate margin. They differ primarily in the proportions of incoming sediment and upflowing melange offscraped and underplated near the toe of the overriding block. The model predicts complex patterns of uplift or subsidence of the forearc region due
Mark Cloos
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The study of subduction channels: Progress, controversies, and challenges
Science China Earth Sciences, 2020The subduction channel is defined as a relatively thin and weak zone with coherent kinematics between the descending and overriding plates during subduction. The materials in the channel, showing the characteristics of melange, consist of low-density, low-viscosity, highly sheared metasediments and/or serpentinite-rich matrix with relatively rigid ...
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Depth-varying azimuthal anisotropy in the Tohoku subduction channel
Earth and Planetary Science Letters, 2017Abstract We determine a detailed 3-D model of azimuthal anisotropy tomography of the Tohoku subduction zone from the Japan Trench outer-rise to the back-arc near the Japan Sea coast, using a large number of high-quality P and S wave arrival-time data of local earthquakes recorded by the dense seismic network on the Japan Islands.
Xin Liu, Dapeng Zhao
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Subduction zone evolution and low viscosity wedges and channels
Earth and Planetary Science Letters, 2007Dehydration of subducting lithosphere likely transports fluid into the mantle wedge where the viscosity is decreased. Such a decrease in viscosity could form a low viscosity wedge (LVW) or a low viscosity channel (LVC) on top of the subducting slab. Using numerical models, we investigate the influence of low viscosity wedges and channels on subduction ...
Manea, Vlad, Gurnis, Michael
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Journal of Metamorphic Geology, 2023
AbstractWe investigated the tectonic evolution of amphibolite and blueschist tectonic blocks in the serpentinite‐ or pelite‐matrix mélange, which are distributed at the highest structural level of the high‐P/Ttype Kamuikotan metamorphic rocks in northern Japan.
Toru Takeshita +4 more
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AbstractWe investigated the tectonic evolution of amphibolite and blueschist tectonic blocks in the serpentinite‐ or pelite‐matrix mélange, which are distributed at the highest structural level of the high‐P/Ttype Kamuikotan metamorphic rocks in northern Japan.
Toru Takeshita +4 more
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Material transportation and fluid-melt activity in the subduction channel: Numerical modeling
Science China Earth Sciences, 2015The subduction channel is defined as a planar to wedge-like area of variable size, internal structure and composition, which forms between the upper and lower plates during slab subduction into the mantle. The materials in the channel may experience complex pressure, temperature, stress and strain evolution, as well as strong fluid and melt activity. A
Mingqi Liu, Taras Gerya, Gerya Taras
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Davie Ridge: Cretaceous Incipient Subduction Zone in the Mozambique Channel
81st EAGE Conference and Exhibition 2019, 2019Summary The main objective of this study is to understand the origin of crustal features and geodynamic of the David Ridge and Angoche Basin in the Mozambique Channel as it is a crucial step in plate reconstruction as well as enabling an assessment of petroleum potential.
A. Intawong +3 more
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