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Detrital zircon U–Pb geochronology and geochemistry of late Neoproterozoic – early Cambrian sedimentary rocks in the Cathaysia Block: constraint on its palaeo-position in Gondwana supercontinent

Published online by Cambridge University Press:  06 March 2019

Chen Xiong*
Affiliation:
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China Department of Earth Sciences, Durham University, Durham DH1 3LE, United Kingdom
Yaoling Niu
Affiliation:
Department of Earth Sciences, Durham University, Durham DH1 3LE, United Kingdom Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Hongde Chen
Affiliation:
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
Anqing Chen*
Affiliation:
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
Chenggong Zhang
Affiliation:
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
Feng Li
Affiliation:
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China The No. 3 Gas Production Plant, SINOPEC Southwest China Oil and Gas Company, Deyang, China
Shuai Yang
Affiliation:
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
Shenglin Xu
Affiliation:
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
*
Authors for correspondence: Chen Xiong and Anqing Chen, Emails: xiongchen105@163.com and aqinth@163.com
Authors for correspondence: Chen Xiong and Anqing Chen, Emails: xiongchen105@163.com and aqinth@163.com

Abstract

We present updated U–Pb ages and Hf isotopic compositions of detrital zircons and whole-rock geochemical data to investigate the provenance and tectonic setting of late Neoproterozoic and early Cambrian sandstones from the Cathaysia Block, in order to offer new constraints on its tectonic evolution and its palaeo-position within the supercontinent. The source rocks for the studied sandstones were dominated by felsic–intermediate materials with moderate weathering history. U–Pb dating results show major populations at c. 2500 Ma, 1000–900 Ma and 870–716 Ma with subordinate peaks at 655–532 Ma, consistent with the global Neoarchean continental crust growth, assembly and break-up of Rodinia, and Pan-African Event associated with the formation of Gondwana. Zircon U–Pb ages and Hf isotopic data suggest that most derived from exotic terranes once connected to the Cathaysia Block. Using whole-rock geochemical analysis, it was determined that the studied sedimentary rocks were deposited in a passive continental margin and the Cathaysia and Yangtze blocks were part of the same continent; no Cambrian ocean existed between them. Compiling a detrital zircon dataset from Qiangtang, northern India, the Lhasa Terrane and Western Australia, the Cathaysia Block seems to be more similar to the Qiangtang and western part of the northern India margin, instead of having a direct connection with the Lhasa Terrane and Western Australia in the Gondwana reconstruction during the late Neoproterozoic and Cambrian eons.

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Type
Original Article
Copyright
© Cambridge University Press 2019 

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