New identification and significance of Early Cretaceous mafic rocks in the interior South China Block

Abstract Early Cretaceous mafic rocks are first reported in the northern Guangxi region from the western Qin-Hang belt in the interior South China Block. A systematic investigation of zircon U–Pb dating, whole-rock geochemistry, Sm–Nd isotopes and zircon Hf–O isotopes for these mafic rocks reveals t...

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Autores principales:	Hui-Min Su, Shao-Yong Jiang, Jia-Bin Shao, Dong-Yang Zhang, Xiang-Ke Wu, Xi-Qiang Huang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4b10a6d8dfcd40f2bc36b026dc5cc5e4
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spelling	oai:doaj.org-article:4b10a6d8dfcd40f2bc36b026dc5cc5e42021-12-02T15:03:14ZNew identification and significance of Early Cretaceous mafic rocks in the interior South China Block10.1038/s41598-021-91045-12045-2322https://doaj.org/article/4b10a6d8dfcd40f2bc36b026dc5cc5e42021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91045-1https://doaj.org/toc/2045-2322Abstract Early Cretaceous mafic rocks are first reported in the northern Guangxi region from the western Qin-Hang belt in the interior South China Block. A systematic investigation of zircon U–Pb dating, whole-rock geochemistry, Sm–Nd isotopes and zircon Hf–O isotopes for these mafic rocks reveals their petrogenesis and the mantle composition as well as a new window to reconstruct lithospheric evolution in interior South China Block during Late Mesozoic. Zircon U–Pb dating yielded ages of 131 ± 2 Ma to 136 ± 2 Ma for diabase and gabbro from Baotan area, indicating the first data for Early Cretaceous mafic magmatism in the western Qing-Hang belt. These mafic rocks show calc-alkaline compositions, arc-like trace element distribution patterns, low zircon εHf(t) of − 9.45 to − 6.17 and high δ18O values of + 5.72 to + 8.09‰, as well as low whole-rock εNd(t) values of − 14.27 to − 9.53. These data suggest that the studied mafic rocks are derived from an ancient lithospheric mantle source that was metasomatized during Neoproterozoic subduction. Thus, the occurrence of these mafic rocks indicates a reactivation of Neoproterozoic subducted materials during an extension setting at Late Mesozoic in the western Qin-Hang belt, an old suture zone that amalgamates the Yangtze and Cathaysia blocks.Hui-Min SuShao-Yong JiangJia-Bin ShaoDong-Yang ZhangXiang-Ke WuXi-Qiang HuangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hui-Min Su Shao-Yong Jiang Jia-Bin Shao Dong-Yang Zhang Xiang-Ke Wu Xi-Qiang Huang New identification and significance of Early Cretaceous mafic rocks in the interior South China Block
description	Abstract Early Cretaceous mafic rocks are first reported in the northern Guangxi region from the western Qin-Hang belt in the interior South China Block. A systematic investigation of zircon U–Pb dating, whole-rock geochemistry, Sm–Nd isotopes and zircon Hf–O isotopes for these mafic rocks reveals their petrogenesis and the mantle composition as well as a new window to reconstruct lithospheric evolution in interior South China Block during Late Mesozoic. Zircon U–Pb dating yielded ages of 131 ± 2 Ma to 136 ± 2 Ma for diabase and gabbro from Baotan area, indicating the first data for Early Cretaceous mafic magmatism in the western Qing-Hang belt. These mafic rocks show calc-alkaline compositions, arc-like trace element distribution patterns, low zircon εHf(t) of − 9.45 to − 6.17 and high δ18O values of + 5.72 to + 8.09‰, as well as low whole-rock εNd(t) values of − 14.27 to − 9.53. These data suggest that the studied mafic rocks are derived from an ancient lithospheric mantle source that was metasomatized during Neoproterozoic subduction. Thus, the occurrence of these mafic rocks indicates a reactivation of Neoproterozoic subducted materials during an extension setting at Late Mesozoic in the western Qin-Hang belt, an old suture zone that amalgamates the Yangtze and Cathaysia blocks.
format	article
author	Hui-Min Su Shao-Yong Jiang Jia-Bin Shao Dong-Yang Zhang Xiang-Ke Wu Xi-Qiang Huang
author_facet	Hui-Min Su Shao-Yong Jiang Jia-Bin Shao Dong-Yang Zhang Xiang-Ke Wu Xi-Qiang Huang
author_sort	Hui-Min Su
title	New identification and significance of Early Cretaceous mafic rocks in the interior South China Block
title_short	New identification and significance of Early Cretaceous mafic rocks in the interior South China Block
title_full	New identification and significance of Early Cretaceous mafic rocks in the interior South China Block
title_fullStr	New identification and significance of Early Cretaceous mafic rocks in the interior South China Block
title_full_unstemmed	New identification and significance of Early Cretaceous mafic rocks in the interior South China Block
title_sort	new identification and significance of early cretaceous mafic rocks in the interior south china block
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/4b10a6d8dfcd40f2bc36b026dc5cc5e4
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New identification and significance of Early Cretaceous mafic rocks in the interior South China Block

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