Zircon Ages of Metasedimentary Rocks in the Wuwamen Ophiolitic Mélange, Chinese South Tianshan: Implications for the Paleozoic Subduction-Accretion in the Southern Central Asian Orogenic Belt

Xin-Shui Wang; Fei Yang; Reiner Klemd; Tuo Jiang; Jun Gao

doi:10.1007/s12583-022-1695-0

Volume 33 Issue 5

Oct 2022

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Journal of Earth Science > 2022 > 33(5): 1059-1071.

Xin-Shui Wang, Fei Yang, Reiner Klemd, Tuo Jiang, Jun Gao. Zircon Ages of Metasedimentary Rocks in the Wuwamen Ophiolitic Mélange, Chinese South Tianshan: Implications for the Paleozoic Subduction-Accretion in the Southern Central Asian Orogenic Belt. Journal of Earth Science, 2022, 33(5): 1059-1071. doi: 10.1007/s12583-022-1695-0

Citation:

Xin-Shui Wang, Fei Yang, Reiner Klemd, Tuo Jiang, Jun Gao. Zircon Ages of Metasedimentary Rocks in the Wuwamen Ophiolitic Mélange, Chinese South Tianshan: Implications for the Paleozoic Subduction-Accretion in the Southern Central Asian Orogenic Belt. Journal of Earth Science, 2022, 33(5): 1059-1071. doi: 10.1007/s12583-022-1695-0

Citation:

Xin-Shui Wang, Fei Yang, Reiner Klemd, Tuo Jiang, Jun Gao. Zircon Ages of Metasedimentary Rocks in the Wuwamen Ophiolitic Mélange, Chinese South Tianshan: Implications for the Paleozoic Subduction-Accretion in the Southern Central Asian Orogenic Belt. Journal of Earth Science, 2022, 33(5): 1059-1071. doi: 10.1007/s12583-022-1695-0

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Zircon Ages of Metasedimentary Rocks in the Wuwamen Ophiolitic Mélange, Chinese South Tianshan: Implications for the Paleozoic Subduction-Accretion in the Southern Central Asian Orogenic Belt

doi: 10.1007/s12583-022-1695-0

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Guangzhou Urban Planning & Design Survey Research Institute, Guangzhou 510060, China
3.
GeoZentrum Nordbayern, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schlossgarten 5a, Erlangen 91054, Germany
4.
Laboratory of Isotope Geochemistry, Wuhan Centre of China Geological Survey, Wuhan 430205, China
5.
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing100029, China

More Information

Corresponding author: Xin-Shui Wang, wangxinshui@cug.edu.cn
Received Date: 20 Jan 2022
Accepted Date: 03 Jun 2022
Issue Publish Date: 30 Oct 2022

Abstract

Abstract

High-temperature and high-pressure (high-grade) metamorphic complexes of variable ages are common in the Central Asian orogenic belt (CAOB), and their precise geochronology and origin are essential to unravel the orogenic architecture and crust-production rate of the CAOB. Hereby it is essential to differentiate between pre-orogenic Precambrian basement and Paleozoic arc-accretionary complexes. This study provides precise in situ zircon U-Pb ages for the metasedimentary rocks in the Wuwamen ophiolitic mélange, which is traditionally thought to represent the pre-orogenic basement of the southwestern CAOB. A meta-sandstone from the meta-flysch sequence revealed a widespread ca. 1.8 Ga high-grade metamorphic overprint similar to that of the underlying orthogneisses and, thus, was interpreted to represent pre-orogenic basement fragments that occur as tectonic blocks in the Paleozoic ophiolitic mélange. In contrast, a schist from the mélange matrix is characterized by a ca. 333 Ma high-grade metamorphic overprint, indicating that the northward subduction of the South Tianshan Ocean was still active at this time. The thrust-imbricated high-grade metamorphic rocks of contrasting origins in an accretionary complex have important implications for the understanding the accretionary history and crustal growth of the CAOB. Furthermore, the strongly deformed ophiolitic mélange was intruded by an undeformed granite dyke with an emplacement age younger than ca. 294 Ma, thus providing a minimum age limit for the final closure of the South Tianshan Ocean.
- high-temperature/high-pressure metamorphism,
- Zircon U-Pb,
- ophiolitic mélange,
- subduction,
- Tianshan,
- CAOB,
- geochemistry

Electronic Supplementary Material: Supplementary material (Table S1) is available in the online version of this article at https://doi.org/10.1007/s12583-022-1695-0.

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