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A mid-Palaeozoic ocean–continent transition in the Mazongshan subduction–accretion complex, Beishan, NW China: new structural, chemical and age data constrain the petrogenesis and tectonic evolution

Published online by Cambridge University Press:  21 April 2020

J.-X. Wang ,
K.-X. Zhang Open the ORCID record for K.-X. Zhang [Opens in a new window] ,
Brian F. Windley ,
B.-W. Song ,
X.-H. Kou ,
S.-D. Wang  and
L.-J. Wang
J.-X. Wang
Affiliation:
School of Earth Sciences, China University of Geosciences, Wuhan430074, China State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan430074, China
K.-X. Zhang*
Affiliation:
School of Earth Sciences, China University of Geosciences, Wuhan430074, China State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan430074, China Institute of Geological Survey, China University of Geosciences, Wuhan430074, China
Brian F. Windley
Affiliation:
Department of Geology, University of Leicester, LeicesterLE1 7RH, UK
B.-W. Song
Affiliation:
Institute of Geological Survey, China University of Geosciences, Wuhan430074, China
X.-H. Kou
Affiliation:
Institute of Geological Survey, China University of Geosciences, Wuhan430074, China
S.-D. Wang
Affiliation:
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang065000, China
L.-J. Wang
Affiliation:
School of Earth Sciences, China University of Geosciences, Wuhan430074, China State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan430074, China
*
Author for correspondence: K.-X. Zhang, Email: kx_zhang@cug.edu.cn
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Abstract

Accretionary orogens contain key evidence for the conversion of oceanic to continental crust. The late tectonic history and closure time of the Palaeo-Asian Ocean are recorded in the Mazongshan subduction–accretion complex in the southern Beishan margin of the Central Asian Orogenic Belt. We present new data on the structure, petrology, geochemistry and zircon U–Pb isotope ages of the Mazongshan subduction–accretion complex, which is a tectonic mélange with a block-in-matrix structure. The blocks are of serpentinized peridotite, basalt, gabbro, basaltic andesite, chert and seamount sediments within a matrix that is mainly composed of fore-arc-trench turbidites. U–Pb zircon ages of two gabbros are 454.6 ± 2.5 Ma and 434.1 ± 3.6 Ma, an andesite has a U–Pb zircon age of 451.3 ± 3.5 Ma and a tuffaceous slate has the youngest U–Pb zircon age of 353.6 ± 5.1 Ma. These new isotopic ages, combined with published data on ophiolitic mélanges from central Beishan, indicate that the subduction–accretion of Beishan in the southernmost Central Asian Orogenic Belt lasted until Late Ordovician – Early Carboniferous time. Structure and age data demonstrate that the younging direction of accretion was southwards and that the subduction zone dipped continuously to the north. Accordingly, these results record the conversion of oceanic to continental crust in the southern Beishan accretionary collage.

Keywords

subduction–accretion mélangemagmatic arcsBeishan accretionary collageCentral Asian Orogenic Belt
Type
Original Article
Information
Geological Magazine , Volume 157 , Issue 11 , November 2020 , pp. 1877 - 1897
Copyright
© Cambridge University Press 2020

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