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Multiple mantle metasomatism beneath the Leizhou Peninsula, South China: Evidence from elemental and Sr-Nd-Pb-Hf isotope geochemistry of the late Cenozoic volcanic rocks

Sun, P.; Niu, Yaoling; Guo, P.Y.; Chen, S.; Duan, M.; Gong, H.M.; Wang, X.H.; Xiao, Y.Y.

Multiple mantle metasomatism beneath the Leizhou Peninsula, South China: Evidence from elemental and Sr-Nd-Pb-Hf isotope geochemistry of the late Cenozoic volcanic rocks Thumbnail


Authors

P. Sun

Yaoling Niu

P.Y. Guo

S. Chen

M. Duan

H.M. Gong

X.H. Wang

Y.Y. Xiao



Abstract

We analysed whole-rock major and trace elements and Sr-Nd-Pb-Hf isotopes of the late Cenozoic volcanic rocks in the Leizhou Peninsula, South China to investigate their mantle source characteristics. These volcanic rocks, collected from Jiujiang, Tianyang and Huoju areas of the Leizhou Peninsula, are characterized by incompatible element enrichment but variable isotopic depletion. The volcanic rocks from Jiujiang and Tianyang show prominent primitive-mantle-normalized positive Nb, Ta and Sr anomalies and depleted Sr-Nd-Pb-Hf isotope compositions, whereas those from Huoju show slight positive to negative Nb and Ta anomalies, a prominent positive Pb anomaly, and more enriched Sr-Nd-Pb-Hf isotope compositions. Two types of mantle metasomatism are required to explain the geochemical characteristics of these rocks. The Jiujiang and Tianyang samples were largely derived from a mantle source metasomatized recently by a low-F melt. Such low-F melt is generated within the asthenospheric mantle, which is enriched in volatiles and incompatible elements with positive Sr anomaly and depleted Sr-Nd-Pb-Hf isotope compositions. The Huoju samples were largely derived from a mantle source metasomatized by recycled upper continental crust material. These two types of mantle metasomatism beneath the Leizhou Peninsula are consistent with trace element characteristics of mantle mineralogy (e.g. clinopyroxene vs. amphibole), which reflects source evolution in space and time (e.g. tectonic setting change).

Citation

Sun, P., Niu, Y., Guo, P., Chen, S., Duan, M., Gong, H., …Xiao, Y. (2019). Multiple mantle metasomatism beneath the Leizhou Peninsula, South China: Evidence from elemental and Sr-Nd-Pb-Hf isotope geochemistry of the late Cenozoic volcanic rocks. International Geology Review, 61(14), 1768-1785. https://doi.org/10.1080/00206814.2018.1548307

Journal Article Type Article
Acceptance Date Nov 11, 2018
Online Publication Date Nov 26, 2018
Publication Date 2019
Deposit Date Nov 13, 2018
Publicly Available Date Mar 29, 2024
Journal International Geology Review
Print ISSN 0020-6814
Electronic ISSN 1938-2839
Publisher Taylor and Francis Group
Peer Reviewed Peer Reviewed
Volume 61
Issue 14
Pages 1768-1785
DOI https://doi.org/10.1080/00206814.2018.1548307
Keywords South China, Cenozoic volcanism, mantle metasomatism, low-F melt, recycled UCC material

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