Mantle-derived helium released through the Japan trench bend-faults

Abstract Plate bending-related normal faults (i.e. bend-faults) develop at the outer trench-slope of the oceanic plate incoming into the subduction zone. Numerous geophysical studies and numerical simulations suggest that bend-faults play a key role by providing pathways for seawater to flow into th...

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Autores principales:	Jin-Oh Park, Naoto Takahata, Ehsan Jamali Hondori, Asuka Yamaguchi, Takanori Kagoshima, Tetsuro Tsuru, Gou Fujie, Yue Sun, Juichiro Ashi, Makoto Yamano, Yuji Sano
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/105389f1302e4edba36269035f14782d
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spelling	oai:doaj.org-article:105389f1302e4edba36269035f14782d2021-12-02T17:41:29ZMantle-derived helium released through the Japan trench bend-faults10.1038/s41598-021-91523-62045-2322https://doaj.org/article/105389f1302e4edba36269035f14782d2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91523-6https://doaj.org/toc/2045-2322Abstract Plate bending-related normal faults (i.e. bend-faults) develop at the outer trench-slope of the oceanic plate incoming into the subduction zone. Numerous geophysical studies and numerical simulations suggest that bend-faults play a key role by providing pathways for seawater to flow into the oceanic crust and the upper mantle, thereby promoting hydration of the oceanic plate. However, deep penetration of seawater along bend-faults remains controversial because fluids that have percolated down into the mantle are difficult to detect. This report presents anomalously high helium isotope (3He/4He) ratios in sediment pore water and seismic reflection data which suggest fluid infiltration into the upper mantle and subsequent outflow through bend-faults across the outer slope of the Japan trench. The 3He/4He and 4He/20Ne ratios at sites near-trench bend-faults, which are close to the isotopic ratios of bottom seawater, are almost constant with depth, supporting local seawater inflow. Our findings provide the first reported evidence for a potentially large-scale active hydrothermal circulation system through bend-faults across the Moho (crust-mantle boundary) in and out of the oceanic lithospheric mantle.Jin-Oh ParkNaoto TakahataEhsan Jamali HondoriAsuka YamaguchiTakanori KagoshimaTetsuro TsuruGou FujieYue SunJuichiro AshiMakoto YamanoYuji SanoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jin-Oh Park Naoto Takahata Ehsan Jamali Hondori Asuka Yamaguchi Takanori Kagoshima Tetsuro Tsuru Gou Fujie Yue Sun Juichiro Ashi Makoto Yamano Yuji Sano Mantle-derived helium released through the Japan trench bend-faults
description	Abstract Plate bending-related normal faults (i.e. bend-faults) develop at the outer trench-slope of the oceanic plate incoming into the subduction zone. Numerous geophysical studies and numerical simulations suggest that bend-faults play a key role by providing pathways for seawater to flow into the oceanic crust and the upper mantle, thereby promoting hydration of the oceanic plate. However, deep penetration of seawater along bend-faults remains controversial because fluids that have percolated down into the mantle are difficult to detect. This report presents anomalously high helium isotope (3He/4He) ratios in sediment pore water and seismic reflection data which suggest fluid infiltration into the upper mantle and subsequent outflow through bend-faults across the outer slope of the Japan trench. The 3He/4He and 4He/20Ne ratios at sites near-trench bend-faults, which are close to the isotopic ratios of bottom seawater, are almost constant with depth, supporting local seawater inflow. Our findings provide the first reported evidence for a potentially large-scale active hydrothermal circulation system through bend-faults across the Moho (crust-mantle boundary) in and out of the oceanic lithospheric mantle.
format	article
author	Jin-Oh Park Naoto Takahata Ehsan Jamali Hondori Asuka Yamaguchi Takanori Kagoshima Tetsuro Tsuru Gou Fujie Yue Sun Juichiro Ashi Makoto Yamano Yuji Sano
author_facet	Jin-Oh Park Naoto Takahata Ehsan Jamali Hondori Asuka Yamaguchi Takanori Kagoshima Tetsuro Tsuru Gou Fujie Yue Sun Juichiro Ashi Makoto Yamano Yuji Sano
author_sort	Jin-Oh Park
title	Mantle-derived helium released through the Japan trench bend-faults
title_short	Mantle-derived helium released through the Japan trench bend-faults
title_full	Mantle-derived helium released through the Japan trench bend-faults
title_fullStr	Mantle-derived helium released through the Japan trench bend-faults
title_full_unstemmed	Mantle-derived helium released through the Japan trench bend-faults
title_sort	mantle-derived helium released through the japan trench bend-faults
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/105389f1302e4edba36269035f14782d
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Mantle-derived helium released through the Japan trench bend-faults

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