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Differentiating continental and oceanic arc systems and retro-arc basins in the Jiangnan orogenic belt, South China

Published online by Cambridge University Press:  17 May 2019

Jinlong Yao ,
Liangshu Shu Open the ORCID record for Liangshu Shu [Opens in a new window] ,
Peter A. Cawood  and
Guochun Zhao
Jinlong Yao
Affiliation:
State Key Laboratory for Mineral Deposits Research, School of Earth and Engineering Sciences, Nanjing University, Nanjing 210093, China Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, SAR State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, 710069, China
Liangshu Shu*
Affiliation:
State Key Laboratory for Mineral Deposits Research, School of Earth and Engineering Sciences, Nanjing University, Nanjing 210093, China
Peter A. Cawood
Affiliation:
School of Earth, Atmosphere & Environment, Monash University, Melbourne, VIC 3800, Australia Department of Earth Sciences, University of St Andrews, St Andrews, KY16 9AL, UK
Guochun Zhao
Affiliation:
Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, SAR
*
Author for correspondence: Liangshu Shu, Email: lsshu@nju.edu.cn
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Abstract

The Neoproterozoic Jiangnan orogenic belt records the accretion and collision between the Yangtze and Cathaysia blocks in South China. The orogen is divisible into three units: a northeastern domain (also referred to as the Huaiyu or Shuangxiwu domain), a central domain (Jiuling domain) and an undifferentiated southwestern domain. Detrital zircons from the oldest sequences (Shuangqiaoshan, Lengjiaxi, Fanjingshan and Sibao groups) in the central and southwest domains yield similar age spectra with major age populations at c. 875–820 Ma, along with minor Palaeo- to Mesoproterozoic and Archaean ages. The dominance of detrital ages close to the deposition ages of the units, along with juvenile zircon Hf isotopic compositions and arc-like whole-rock compositional data, indicate the sedimentary units accumulated adjacent to a convergent plate margin magmatic arc. The presence of Mesoproterozoic and older zircons, both as detritus in the units and as xenocrysts within igneous rocks displaying a subduction-related signature, along with the compositional data, place the magmatic arc along a continental margin. In the northeastern domain, the oldest coeval sequence (Shuangxiwu and Qigong groups) and arc igneous suites are dated at c. 970–850 Ma, and lack older detritus and xenocrysts, indicating they represent an accreted oceanic arc system.

Keywords

continental arcoceanic arcretro-arc basindetrital zirconsisotopes and whole-rock geochemistryJiangnan orogenic belt
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 12 , December 2019 , pp. 2001 - 2016
Copyright
© Cambridge University Press 2019 

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