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

Xia, Y. and Xu, X.S. and Niu, Y.L. and Liu, L. (2018) 'Neoproterozoic amalgamation between Yangtze and Cathaysia blocks : the magmatism in various tectonic settings and continent-arc-continent collision.', Precambrian research., 309 . pp. 56-87.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.precamres.2017.02.020
Date accepted:24 February 2017
Date deposited:14 March 2017
Date of first online publication:06 March 2017
Date first made open access:No date available

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