Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion

Abstract This paper explores the evolutional process of back-arc basin (BAB) magma system at final spreading stage of extinct BAB, Shikoku Basin (Philippine Sea) and assesses its tectonic evolution using a newly discovered oceanic core complex, the Mado Megamullion. Bulk and in-situ chemical composi...

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Autores principales:	Norikatsu Akizawa, Yasuhiko Ohara, Kyoko Okino, Osamu Ishizuka, Hiroyuki Yamashita, Shiki Machida, Alessio Sanfilippo, Valentin Basch, Jonathan E. Snow, Atlanta Sen, Ken-ichi Hirauchi, Katsuyoshi Michibayashi, Yumiko Harigane, Masakazu Fujii, Hisashi Asanuma, Takafumi Hirata
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Gabbro Peridotite Oceanic core complex Magmatic water In-situ Pb isotope And Slab rollback Geography. Anthropology. Recreation G Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/82dfe0de66d04ffabf0571d7db3be4f6
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spelling	oai:doaj.org-article:82dfe0de66d04ffabf0571d7db3be4f62021-11-21T12:07:35ZGeochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion10.1186/s40645-021-00454-32197-4284https://doaj.org/article/82dfe0de66d04ffabf0571d7db3be4f62021-11-01T00:00:00Zhttps://doi.org/10.1186/s40645-021-00454-3https://doaj.org/toc/2197-4284Abstract This paper explores the evolutional process of back-arc basin (BAB) magma system at final spreading stage of extinct BAB, Shikoku Basin (Philippine Sea) and assesses its tectonic evolution using a newly discovered oceanic core complex, the Mado Megamullion. Bulk and in-situ chemical compositions together with in-situ Pb isotope composition of dolerite, oxide gabbro, gabbro, olivine gabbro, dunite, and peridotite are presented. Compositional ranges and trends of the igneous and peridotitic rocks from the Mado Megamullion are similar to those from the slow- to ultraslow-spreading mid-ocean ridges (MOR). Since the timing of the Mado Megamullion exhumation corresponds to the very end of the Shikoku Basin opening, the magma supply was subdued and highly episodic, leading to extreme magma differentiation to form ferrobasaltic, hydrous magmas. In-situ Pb isotope composition of magmatic brown amphibole in the oxide gabbro is identical to that of depleted source mantle for mid-ocean ridge basalt (MORB). In the context of hydrous BAB magma genesis, the magmatic water was derived solely from the MORB source mantle. The distance from the back-arc spreading center to the arc front increased away through maturing of the Shikoku Basin to cause MORB-like magmatism. After the exhumation of Mado Megamullion along detachment faults, dolerite dikes intruded as a post-spreading magmatism. The final magmatism along with post-spreading Kinan Seamount Chain volcanism were introduced around the extinct back-arc spreading center after the opening of Shikoku Basin by residual mantle upwelling.Norikatsu AkizawaYasuhiko OharaKyoko OkinoOsamu IshizukaHiroyuki YamashitaShiki MachidaAlessio SanfilippoValentin BaschJonathan E. SnowAtlanta SenKen-ichi HirauchiKatsuyoshi MichibayashiYumiko HariganeMasakazu FujiiHisashi AsanumaTakafumi HirataSpringerOpenarticleGabbroPeridotiteOceanic core complexMagmatic waterIn-situ Pb isotopeAnd Slab rollbackGeography. Anthropology. RecreationGGeologyQE1-996.5ENProgress in Earth and Planetary Science, Vol 8, Iss 1, Pp 1-24 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Gabbro Peridotite Oceanic core complex Magmatic water In-situ Pb isotope And Slab rollback Geography. Anthropology. Recreation G Geology QE1-996.5
spellingShingle	Gabbro Peridotite Oceanic core complex Magmatic water In-situ Pb isotope And Slab rollback Geography. Anthropology. Recreation G Geology QE1-996.5 Norikatsu Akizawa Yasuhiko Ohara Kyoko Okino Osamu Ishizuka Hiroyuki Yamashita Shiki Machida Alessio Sanfilippo Valentin Basch Jonathan E. Snow Atlanta Sen Ken-ichi Hirauchi Katsuyoshi Michibayashi Yumiko Harigane Masakazu Fujii Hisashi Asanuma Takafumi Hirata Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion
description	Abstract This paper explores the evolutional process of back-arc basin (BAB) magma system at final spreading stage of extinct BAB, Shikoku Basin (Philippine Sea) and assesses its tectonic evolution using a newly discovered oceanic core complex, the Mado Megamullion. Bulk and in-situ chemical compositions together with in-situ Pb isotope composition of dolerite, oxide gabbro, gabbro, olivine gabbro, dunite, and peridotite are presented. Compositional ranges and trends of the igneous and peridotitic rocks from the Mado Megamullion are similar to those from the slow- to ultraslow-spreading mid-ocean ridges (MOR). Since the timing of the Mado Megamullion exhumation corresponds to the very end of the Shikoku Basin opening, the magma supply was subdued and highly episodic, leading to extreme magma differentiation to form ferrobasaltic, hydrous magmas. In-situ Pb isotope composition of magmatic brown amphibole in the oxide gabbro is identical to that of depleted source mantle for mid-ocean ridge basalt (MORB). In the context of hydrous BAB magma genesis, the magmatic water was derived solely from the MORB source mantle. The distance from the back-arc spreading center to the arc front increased away through maturing of the Shikoku Basin to cause MORB-like magmatism. After the exhumation of Mado Megamullion along detachment faults, dolerite dikes intruded as a post-spreading magmatism. The final magmatism along with post-spreading Kinan Seamount Chain volcanism were introduced around the extinct back-arc spreading center after the opening of Shikoku Basin by residual mantle upwelling.
format	article
author	Norikatsu Akizawa Yasuhiko Ohara Kyoko Okino Osamu Ishizuka Hiroyuki Yamashita Shiki Machida Alessio Sanfilippo Valentin Basch Jonathan E. Snow Atlanta Sen Ken-ichi Hirauchi Katsuyoshi Michibayashi Yumiko Harigane Masakazu Fujii Hisashi Asanuma Takafumi Hirata
author_facet	Norikatsu Akizawa Yasuhiko Ohara Kyoko Okino Osamu Ishizuka Hiroyuki Yamashita Shiki Machida Alessio Sanfilippo Valentin Basch Jonathan E. Snow Atlanta Sen Ken-ichi Hirauchi Katsuyoshi Michibayashi Yumiko Harigane Masakazu Fujii Hisashi Asanuma Takafumi Hirata
author_sort	Norikatsu Akizawa
title	Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion
title_short	Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion
title_full	Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion
title_fullStr	Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion
title_full_unstemmed	Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion
title_sort	geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of shikoku basin: an example of mado megamullion
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/82dfe0de66d04ffabf0571d7db3be4f6
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Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion

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