Separation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene

Abstract The West Philippine Basin (WPB) has started opening at ~ 58 Ma and ceased spreading at ~ 33 Ma, developing a fast spreading (~ 44 mm/yr half-spreading rate) magmatic episode between 58 and 41 Ma and the second amagmatic episode between 41 and 33 Ma. The occurrence of the first stage of spre...

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Autores principales:	Yi-Ching Yeh, Jing-Yi Lin, Shu-Kun Hsu, Ching-Hui Tsai, Ching-Min Chang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/72b509ac4e3a4b3692f5ef41ecefe2a8
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spelling	oai:doaj.org-article:72b509ac4e3a4b3692f5ef41ecefe2a82021-11-08T10:54:34ZSeparation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene10.1038/s41598-021-01330-22045-2322https://doaj.org/article/72b509ac4e3a4b3692f5ef41ecefe2a82021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01330-2https://doaj.org/toc/2045-2322Abstract The West Philippine Basin (WPB) has started opening at ~ 58 Ma and ceased spreading at ~ 33 Ma, developing a fast spreading (~ 44 mm/yr half-spreading rate) magmatic episode between 58 and 41 Ma and the second amagmatic episode between 41 and 33 Ma. The occurrence of the first stage of spreading is closely related to the Oki-Daito mantle plume and related Benham Rise (BR) and Urdaneta Plateau (UP) activity. To the east of the Luzon–Okinawa Fracture Zone (LOFZ), BR was the most active volcanism from 48 to 41 Ma. The geomagnetic ages on both sides of the LOFZ have been determined; however, their causal relationship and evolution in the WPB remain unclear. In this study, we performed integrated analyses of multichannel seismic data and swath bathymetry data for the area to the west of the LOFZ. To the west of the LOFZ, the Gagua Rise (GR), is identified by a high residual free-air gravity anomaly, volcanic seamount chains and an overlapping spreading center. The GR is located at magnetic isochrons C20/C22 (50 to 44 Ma) and shows a thick oceanic crust of at least 12.7 km. We first propose an oceanic plateau named Great Benham Rise (GBR) which includes GR, UP and BR. We infer that the GR was a portion of the GBR since ~ 49 Ma and was separated from the GBR at ~ 41 Ma by the right-lateral LOFZ motion. Later, the relict GBR magmatism only continued in the area to the east of the LOFZ. Overall, the GBR dominates the spreading history of the WPB.Yi-Ching YehJing-Yi LinShu-Kun HsuChing-Hui TsaiChing-Min ChangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yi-Ching Yeh Jing-Yi Lin Shu-Kun Hsu Ching-Hui Tsai Ching-Min Chang Separation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene
description	Abstract The West Philippine Basin (WPB) has started opening at ~ 58 Ma and ceased spreading at ~ 33 Ma, developing a fast spreading (~ 44 mm/yr half-spreading rate) magmatic episode between 58 and 41 Ma and the second amagmatic episode between 41 and 33 Ma. The occurrence of the first stage of spreading is closely related to the Oki-Daito mantle plume and related Benham Rise (BR) and Urdaneta Plateau (UP) activity. To the east of the Luzon–Okinawa Fracture Zone (LOFZ), BR was the most active volcanism from 48 to 41 Ma. The geomagnetic ages on both sides of the LOFZ have been determined; however, their causal relationship and evolution in the WPB remain unclear. In this study, we performed integrated analyses of multichannel seismic data and swath bathymetry data for the area to the west of the LOFZ. To the west of the LOFZ, the Gagua Rise (GR), is identified by a high residual free-air gravity anomaly, volcanic seamount chains and an overlapping spreading center. The GR is located at magnetic isochrons C20/C22 (50 to 44 Ma) and shows a thick oceanic crust of at least 12.7 km. We first propose an oceanic plateau named Great Benham Rise (GBR) which includes GR, UP and BR. We infer that the GR was a portion of the GBR since ~ 49 Ma and was separated from the GBR at ~ 41 Ma by the right-lateral LOFZ motion. Later, the relict GBR magmatism only continued in the area to the east of the LOFZ. Overall, the GBR dominates the spreading history of the WPB.
format	article
author	Yi-Ching Yeh Jing-Yi Lin Shu-Kun Hsu Ching-Hui Tsai Ching-Min Chang
author_facet	Yi-Ching Yeh Jing-Yi Lin Shu-Kun Hsu Ching-Hui Tsai Ching-Min Chang
author_sort	Yi-Ching Yeh
title	Separation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene
title_short	Separation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene
title_full	Separation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene
title_fullStr	Separation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene
title_full_unstemmed	Separation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene
title_sort	separation of gagua rise from great benham rise in the west philippine basin during the middle eocene
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/72b509ac4e3a4b3692f5ef41ecefe2a8
work_keys_str_mv	AT yichingyeh separationofgaguarisefromgreatbenhamriseinthewestphilippinebasinduringthemiddleeocene AT jingyilin separationofgaguarisefromgreatbenhamriseinthewestphilippinebasinduringthemiddleeocene AT shukunhsu separationofgaguarisefromgreatbenhamriseinthewestphilippinebasinduringthemiddleeocene AT chinghuitsai separationofgaguarisefromgreatbenhamriseinthewestphilippinebasinduringthemiddleeocene AT chingminchang separationofgaguarisefromgreatbenhamriseinthewestphilippinebasinduringthemiddleeocene
_version_	1718442536981233664

Separation of Gagua Rise from Great Benham Rise in the West Philippine Basin during the Middle Eocene

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