Mantle hydration along outer-rise faults inferred from serpentinite permeability

Abstract Recent geophysical surveys indicate that hydration (serpentinization) of oceanic mantle is related to outer-rise faulting prior to subduction. The serpentinization of oceanic mantle influences the generation of intermediate-depth earthquakes and subduction water flux, thereby promoting arc...

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Autores principales:	Kohei Hatakeyama, Ikuo Katayama, Ken-ichi Hirauchi, Katsuyoshi Michibayashi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/77a211d3415a4a918093fce86bb26889
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spelling	oai:doaj.org-article:77a211d3415a4a918093fce86bb268892021-12-02T11:52:16ZMantle hydration along outer-rise faults inferred from serpentinite permeability10.1038/s41598-017-14309-92045-2322https://doaj.org/article/77a211d3415a4a918093fce86bb268892017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-14309-9https://doaj.org/toc/2045-2322Abstract Recent geophysical surveys indicate that hydration (serpentinization) of oceanic mantle is related to outer-rise faulting prior to subduction. The serpentinization of oceanic mantle influences the generation of intermediate-depth earthquakes and subduction water flux, thereby promoting arc volcanism. Since the chemical reactions that produce serpentinite are geologically rapid at low temperatures, the flux of water delivery to the reaction front appears to control the lateral extent of serpentinization. In this study, we measured the permeability of low-temperature serpentinites composed of lizardite and chrysotile, and calculated the lateral extent of serpentinization along an outer-rise fault based on Darcy’s law. The experimental results indicate that serpentinization extends to a region several hundred meters wide in the direction normal to the outer-rise fault in the uppermost oceanic mantle. We calculated the global water flux carried by serpentinized oceanic mantle ranging from 1.7 × 1011 to 2.4 × 1012 kg/year, which is comparable or even higher than the water flux of hydrated oceanic crust.Kohei HatakeyamaIkuo KatayamaKen-ichi HirauchiKatsuyoshi MichibayashiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kohei Hatakeyama Ikuo Katayama Ken-ichi Hirauchi Katsuyoshi Michibayashi Mantle hydration along outer-rise faults inferred from serpentinite permeability
description	Abstract Recent geophysical surveys indicate that hydration (serpentinization) of oceanic mantle is related to outer-rise faulting prior to subduction. The serpentinization of oceanic mantle influences the generation of intermediate-depth earthquakes and subduction water flux, thereby promoting arc volcanism. Since the chemical reactions that produce serpentinite are geologically rapid at low temperatures, the flux of water delivery to the reaction front appears to control the lateral extent of serpentinization. In this study, we measured the permeability of low-temperature serpentinites composed of lizardite and chrysotile, and calculated the lateral extent of serpentinization along an outer-rise fault based on Darcy’s law. The experimental results indicate that serpentinization extends to a region several hundred meters wide in the direction normal to the outer-rise fault in the uppermost oceanic mantle. We calculated the global water flux carried by serpentinized oceanic mantle ranging from 1.7 × 1011 to 2.4 × 1012 kg/year, which is comparable or even higher than the water flux of hydrated oceanic crust.
format	article
author	Kohei Hatakeyama Ikuo Katayama Ken-ichi Hirauchi Katsuyoshi Michibayashi
author_facet	Kohei Hatakeyama Ikuo Katayama Ken-ichi Hirauchi Katsuyoshi Michibayashi
author_sort	Kohei Hatakeyama
title	Mantle hydration along outer-rise faults inferred from serpentinite permeability
title_short	Mantle hydration along outer-rise faults inferred from serpentinite permeability
title_full	Mantle hydration along outer-rise faults inferred from serpentinite permeability
title_fullStr	Mantle hydration along outer-rise faults inferred from serpentinite permeability
title_full_unstemmed	Mantle hydration along outer-rise faults inferred from serpentinite permeability
title_sort	mantle hydration along outer-rise faults inferred from serpentinite permeability
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/77a211d3415a4a918093fce86bb26889
work_keys_str_mv	AT koheihatakeyama mantlehydrationalongouterrisefaultsinferredfromserpentinitepermeability AT ikuokatayama mantlehydrationalongouterrisefaultsinferredfromserpentinitepermeability AT kenichihirauchi mantlehydrationalongouterrisefaultsinferredfromserpentinitepermeability AT katsuyoshimichibayashi mantlehydrationalongouterrisefaultsinferredfromserpentinitepermeability
_version_	1718395110803111936

Mantle hydration along outer-rise faults inferred from serpentinite permeability

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