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Neoproterozoic amalgamation between Yangtze and Cathaysia blocks: The magmatism in various tectonic settings and continent-arc-continent collision

Xia, Y.; Xu, X.S.; Niu, Yaoling; Liu, L.

Neoproterozoic amalgamation between Yangtze and Cathaysia blocks: The magmatism in various tectonic settings and continent-arc-continent collision Thumbnail


Authors

Y. Xia

X.S. Xu

Yaoling Niu

L. Liu



Abstract

According to the temporal-spatial distribution of Neoproterozoic igneous rocks and relative rocks in South China, including ophiolites, arc volcanic and intrusive rocks and subsequent bimodal magmatism, we identified the presence of a Neoproterozoic intra-oceanic arc, continent-arc-continent collision and three tectono-magmatic zones between the Yangtze Block and Cathaysia Block. We have also unraveled the amalgamation and tectono-magmatic histories between the Yangtze and Cathaysia blocks: At ∼ 1000–860 Ma, northwestward ocean-ocean subduction and southeastward ocean-continent subduction resulted in the intra-oceanic arc magmatism and active continental margin magmatism in the Cathaysia Block respectively. At ∼ 860–825 Ma, the steepening subdution caused development of back-arc basin in the intra-oceanic arc zone and the slab rollback induced the arc and back-arc magmitism in the Cathaysia Block. Meanwhile, a shallow dip northwestward ocean-continent subduction formed active continental margin magmatism in the Yangtze Block. At ∼ 825–805 Ma, the continent-arc-continent collision and final amalgamation between the Yangtze and Cathaysia blocks yielded the Jiangnan Orogen. At ∼ 805–750 Ma, the Jiangnan Orogen collapsed, and the Nanhua rift basin formed. Our study also rules out any Grenvillian Orogenic event and mantle plume activity in South China and indicates a marginal position of South China in the Rodinia supercontinent.

Citation

Xia, Y., Xu, X., Niu, Y., & Liu, L. (2018). Neoproterozoic amalgamation between Yangtze and Cathaysia blocks: The magmatism in various tectonic settings and continent-arc-continent collision. Precambrian Research, 309, 56-87. https://doi.org/10.1016/j.precamres.2017.02.020

Journal Article Type Article
Acceptance Date Feb 24, 2017
Online Publication Date Mar 6, 2017
Publication Date May 1, 2018
Deposit Date Mar 13, 2017
Publicly Available Date Mar 28, 2024
Journal Precambrian Research
Print ISSN 0301-9268
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 309
Pages 56-87
DOI https://doi.org/10.1016/j.precamres.2017.02.020

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