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An Andean-type arc system in Rodinia constrained by the Neoproterozoic Shimian ophiolite in South China

Zhao, Jun-Hong and Asimow, Paul D. and Zhou, Mei-Fu and Zhang, Jian and Yan, Dan-Ping and Zheng, Jian-Ping (2017) An Andean-type arc system in Rodinia constrained by the Neoproterozoic Shimian ophiolite in South China. Precambrian Research, 296 . pp. 93-111. ISSN 0301-9268. https://resolver.caltech.edu/CaltechAUTHORS:20170525-111145489

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Abstract

The configuration of the supercontinent Rodinia has long been a matter of debate; the key controversy is the position of South China in Rodinia. We report an incomplete Neoproterozoic ophiolite sequence, including gabbros and serpentinized peridotites intruded by mafic dikes, near Shimian (Sichuan Province), along the western margin of the Yangtze Block in South China. Serpentinized peridotites have very low REE (0.14–1.16 ppm) and trace element concentrations, and are interpreted as parts of a depleted mantle sequence. Chromites from the serpentinized peridotites have low TiO_2 (<0.3 wt%) and Fe_2O_3 (<7.6 wt%), and moderate Cr/(Cr + Al) (0.48–0.67) and Mg/(Mg + Fe^(2+)) (0.42–0.67) ratios and are clearly indicative of strong depletion of the host peridotites, similar to those of supra-subduction zone (SSZ). Mafic dikes and gabbros contain zircon grains with similar U-Pb ages of ∼800 Ma, and are chemically akin to MORB-like tholeiitic basalts and boninite-series volcanic rocks reported in other SSZ ophiolites and in the Izu-Bonin-Mariana arc system. Therefore, the serpentinized peridotite, mafic dikes and gabbros together appear to form a SSZ-type ophiolite assemblage preserving the accretion of oceanic lithosphere to the western Yangtze Block. The age and location of the Shimian ophiolite rule out the possibility that South China was located in the centre of Rodinia. Instead, the Neoproterozoic arc-affinity igneous rocks at the western margin of the Yangtze Block are well correlated with those in Greater India and Madagascar. These three blocks thus together formed a giant Andean-type arc system along the NW margin of Rodinia that existed for more than 100 Mys.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.precamres.2017.04.017DOIArticle
http://www.sciencedirect.com/science/article/pii/S0301926816306118PublisherArticle
ORCID:
AuthorORCID
Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2017 Elsevier B.V. Received 19 December 2016, Revised 31 March 2017, Accepted 7 April 2017, Available online 10 April 2017. This work was substantially supported by the National Nature Science Foundation of China (41373016 and 41573020) and the Young Thousand Talent Program (32110-32020002). PDA was supported in part by the US National Science Foundation through award EAR-1550934. Reviews by Prof. Manoj K. Pandit and the anonymous referee are gratefully acknowledged.
Funders:
Funding AgencyGrant Number
National Nature Science Foundation of China41373016
National Nature Science Foundation of China41573020
Young Thousand Talent Program32110-32020002
NSFEAR-1550934
Subject Keywords:Ophiolite; Andean-type arc system; Neoproterozoic; South China; Rodinia
Record Number:CaltechAUTHORS:20170525-111145489
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170525-111145489
Official Citation:Jun-Hong Zhao, Paul D. Asimow, Mei-Fu Zhou, Jian Zhang, Dan-Ping Yan, Jian-Ping Zheng, An Andean-type arc system in Rodinia constrained by the Neoproterozoic Shimian ophiolite in South China, Precambrian Research, Volume 296, July 2017, Pages 93-111, ISSN 0301-9268, https://doi.org/10.1016/j.precamres.2017.04.017. (http://www.sciencedirect.com/science/article/pii/S0301926816306118)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77756
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:06 Jun 2017 22:16
Last Modified:03 Oct 2019 18:01

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