Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution

The Okinawa Trough (OT) is an incipient back-arc basin, but its crustal nature is still controversial. Gravity inversion along with sediment and lithospheric mantle density modeling are used to map the regional Moho depth and crustal thickness variations of the OT and its adjacent areas. The gravity...

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Autores principales:	Liang Zhang, Xiwu Luan
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	gravity inversion density modeling crustal thickness Okinawa Trough multi-stage evolution Science Q
Acceso en línea:	https://doaj.org/article/fd34da318ec54f339038d4b3216555cc
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spelling	oai:doaj.org-article:fd34da318ec54f339038d4b3216555cc2021-12-03T06:04:33ZMoho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution2296-646310.3389/feart.2021.752488https://doaj.org/article/fd34da318ec54f339038d4b3216555cc2021-12-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.752488/fullhttps://doaj.org/toc/2296-6463The Okinawa Trough (OT) is an incipient back-arc basin, but its crustal nature is still controversial. Gravity inversion along with sediment and lithospheric mantle density modeling are used to map the regional Moho depth and crustal thickness variations of the OT and its adjacent areas. The gravity inversion result shows that the crustal thicknesses are 17–22 km at the northern OT, 11–19 km at the central OT, and 7–19 km at the southern OT. Because of the crust with a thickness larger than 17 km, the slow southward arc movement, and scarce contemporaneous volcanisms, the northern OT should be in the stage of early back-arc extension. All of the moderate crustal thickness, high heat flow, and intense volcanism at the central OT indicate that this region is probably in the transitional stage from the back-arc rifting to the oceanic spreading. A crust that is only 7 km thick, lithosphere strength as low as the mid-ocean ridge, and MORB-similar basalts at the southern OT demonstrate that the southern OT is at the early stage of seafloor spreading.Liang ZhangLiang ZhangXiwu LuanXiwu LuanFrontiers Media S.A.articlegravity inversiondensity modelingcrustal thicknessOkinawa Troughmulti-stage evolutionScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	gravity inversion density modeling crustal thickness Okinawa Trough multi-stage evolution Science Q
spellingShingle	gravity inversion density modeling crustal thickness Okinawa Trough multi-stage evolution Science Q Liang Zhang Liang Zhang Xiwu Luan Xiwu Luan Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution
description	The Okinawa Trough (OT) is an incipient back-arc basin, but its crustal nature is still controversial. Gravity inversion along with sediment and lithospheric mantle density modeling are used to map the regional Moho depth and crustal thickness variations of the OT and its adjacent areas. The gravity inversion result shows that the crustal thicknesses are 17–22 km at the northern OT, 11–19 km at the central OT, and 7–19 km at the southern OT. Because of the crust with a thickness larger than 17 km, the slow southward arc movement, and scarce contemporaneous volcanisms, the northern OT should be in the stage of early back-arc extension. All of the moderate crustal thickness, high heat flow, and intense volcanism at the central OT indicate that this region is probably in the transitional stage from the back-arc rifting to the oceanic spreading. A crust that is only 7 km thick, lithosphere strength as low as the mid-ocean ridge, and MORB-similar basalts at the southern OT demonstrate that the southern OT is at the early stage of seafloor spreading.
format	article
author	Liang Zhang Liang Zhang Xiwu Luan Xiwu Luan
author_facet	Liang Zhang Liang Zhang Xiwu Luan Xiwu Luan
author_sort	Liang Zhang
title	Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution
title_short	Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution
title_full	Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution
title_fullStr	Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution
title_full_unstemmed	Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution
title_sort	moho geometry of the okinawa trough based on gravity inversion and its implications on the crustal nature and tectonic evolution
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/fd34da318ec54f339038d4b3216555cc
work_keys_str_mv	AT liangzhang mohogeometryoftheokinawatroughbasedongravityinversionanditsimplicationsonthecrustalnatureandtectonicevolution AT liangzhang mohogeometryoftheokinawatroughbasedongravityinversionanditsimplicationsonthecrustalnatureandtectonicevolution AT xiwuluan mohogeometryoftheokinawatroughbasedongravityinversionanditsimplicationsonthecrustalnatureandtectonicevolution AT xiwuluan mohogeometryoftheokinawatroughbasedongravityinversionanditsimplicationsonthecrustalnatureandtectonicevolution
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Moho Geometry of the Okinawa Trough Based on Gravity Inversion and Its Implications on the Crustal Nature and Tectonic Evolution

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