Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks

Abstract Magmatism has profoundly influenced the evolution of the geosphere, hydrosphere, atmosphere, and biosphere in back-arc basins. However, the timing of the magmatism in the Okinawa Trough (OT) is not well constrained by the age spectra of zircons. Here, for the first time, we carry out an int...

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Autores principales:	Zhi-gang Zeng, Zu-xing Chen, Yu-xiang Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3fc545ff2ebe4423b32a89fa0245ebf9
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spelling	oai:doaj.org-article:3fc545ff2ebe4423b32a89fa0245ebf92021-12-02T15:02:52ZZircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks10.1038/s41598-021-90578-92045-2322https://doaj.org/article/3fc545ff2ebe4423b32a89fa0245ebf92021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90578-9https://doaj.org/toc/2045-2322Abstract Magmatism has profoundly influenced the evolution of the geosphere, hydrosphere, atmosphere, and biosphere in back-arc basins. However, the timing of the magmatism in the Okinawa Trough (OT) is not well constrained by the age spectra of zircons. Here, for the first time, we carry out an integrated study combining in situ analysis of zircon U–Th–Pb and Hf–O isotopes, and trace element compositions of zircons from the volcanic rocks from the southernmost part of the OT. We found that the young (< 100 ka) zircons in these volcanic rocks have old (108 Ma to 2.7 Ga) inherited cores, which were captured as the magma ascended through the rifting continental crust. In particular, the inherited Archean zircons strongly suggest that remnants of the old East Asian continental blocks underlie the embryonic crustal rifting zone. Moreover, the ages of most of the inherited zircons correspond to five supercontinent amalgamation events. Specifically, the Archaean inherited zircons, which have positive εHf(t) and low δ18O values, correspond to the formation of juvenile continental crust. In contrast, the negative εHf(t) and high δ18O values of the post-Archaean inherited zircons indicate that their parental magma contained recycled older crust due to the enhanced crust-mantle interactions during the evolution of the early continental crust. Therefore, the inherited zircons in the back-arc volcanic rocks not only reflect the evolution of the local magmatism, but they also contain a record of the Archaean crustal fragment and of several global continental amalgamation events.Zhi-gang ZengZu-xing ChenYu-xiang ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhi-gang Zeng Zu-xing Chen Yu-xiang Zhang Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks
description	Abstract Magmatism has profoundly influenced the evolution of the geosphere, hydrosphere, atmosphere, and biosphere in back-arc basins. However, the timing of the magmatism in the Okinawa Trough (OT) is not well constrained by the age spectra of zircons. Here, for the first time, we carry out an integrated study combining in situ analysis of zircon U–Th–Pb and Hf–O isotopes, and trace element compositions of zircons from the volcanic rocks from the southernmost part of the OT. We found that the young (< 100 ka) zircons in these volcanic rocks have old (108 Ma to 2.7 Ga) inherited cores, which were captured as the magma ascended through the rifting continental crust. In particular, the inherited Archean zircons strongly suggest that remnants of the old East Asian continental blocks underlie the embryonic crustal rifting zone. Moreover, the ages of most of the inherited zircons correspond to five supercontinent amalgamation events. Specifically, the Archaean inherited zircons, which have positive εHf(t) and low δ18O values, correspond to the formation of juvenile continental crust. In contrast, the negative εHf(t) and high δ18O values of the post-Archaean inherited zircons indicate that their parental magma contained recycled older crust due to the enhanced crust-mantle interactions during the evolution of the early continental crust. Therefore, the inherited zircons in the back-arc volcanic rocks not only reflect the evolution of the local magmatism, but they also contain a record of the Archaean crustal fragment and of several global continental amalgamation events.
format	article
author	Zhi-gang Zeng Zu-xing Chen Yu-xiang Zhang
author_facet	Zhi-gang Zeng Zu-xing Chen Yu-xiang Zhang
author_sort	Zhi-gang Zeng
title	Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks
title_short	Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks
title_full	Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks
title_fullStr	Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks
title_full_unstemmed	Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks
title_sort	zircon record of an archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3fc545ff2ebe4423b32a89fa0245ebf9
work_keys_str_mv	AT zhigangzeng zirconrecordofanarchaeancrustalfragmentandsupercontinentamalgamationinquaternarybackarcvolcanicrocks AT zuxingchen zirconrecordofanarchaeancrustalfragmentandsupercontinentamalgamationinquaternarybackarcvolcanicrocks AT yuxiangzhang zirconrecordofanarchaeancrustalfragmentandsupercontinentamalgamationinquaternarybackarcvolcanicrocks
_version_	1718389072900128768

Zircon record of an Archaean crustal fragment and supercontinent amalgamation in quaternary back-arc volcanic rocks

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