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Anatomy of two Permian greenschist- to blueschist-facies tectonic mélanges in the Solonker Suture Zone (Inner Mongolia, northeastern China): evidence for divergent double subduction and soft collision

View ORCID ProfileHuichuan Liu, Jichun Wang, View ORCID ProfileChun-Kit Lai, Yinglei Li, Jingfan Wang, Chongyu Song, Jiadong Zhang, Xin Zhao and Jiangdong Qin
Journal of the Geological Society, 177, 981-996, 8 July 2020, https://doi.org/10.1144/jgs2020-006
Huichuan Liu
1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), , China
Roles: [Conceptualization (Lead)], [Funding acquisition (Lead)], [Investigation (Lead)], [Resources (Lead)]
  • Find this author on Google Scholar
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  • ORCID record for Huichuan Liu
Jichun Wang
2Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-prospecting, , China
3Geological Survey Institute of Inner Mongolia Autonomous, , China
Roles: [Investigation (Equal)]
  • Find this author on Google Scholar
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  • For correspondence: 50027033@qq.com armourzjd@hotmail.com
Chun-Kit Lai
4Faculty of Science, Universiti Brunei Darussalam, , Brunei Darussalam
Roles: [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
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  • ORCID record for Chun-Kit Lai
Yinglei Li
5Institute of Mineral Resources, Chinese Academy of Geological Sciences, , China
6Key Laboratory of Orogen and Crust Evolution, Department of Geology, Peking University, , China
Roles: [Data curation (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
Jingfan Wang
7Management Center of Exploration Fund of Inner Mongolia, , China
Roles: [Investigation (Equal)]
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  • Search for this author on this site
Chongyu Song
8Development and Research Center of China Geological Survey, , China
Roles: [Resources (Equal)]
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Jiadong Zhang
8Development and Research Center of China Geological Survey, , China
Roles: [Investigation (Supporting)]
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Xin Zhao
2Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-prospecting, , China
3Geological Survey Institute of Inner Mongolia Autonomous, , China
Roles: [Investigation (Supporting)]
  • Find this author on Google Scholar
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Jiangdong Qin
2Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-prospecting, , China
3Geological Survey Institute of Inner Mongolia Autonomous, , China
Roles: [Investigation (Supporting)]
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Abstract

The timing and processes of the Paleo-Asian Ocean (PAO) closure are still controversial issues due to ambiguous interpretation of the regional geological records. We describe the structural and kinematic features of two Permian greenschist-/blueschist-facies tectonic mélanges at Zhurihe and Erdaojing in Inner Mongolia (northeastern China), separated by the Solonker Suture. The tectonic mélanges have block-in-matrix fabrics. The Zhurihe tectonic mélange in the south is dominated by NE-trending folds, and east–west- to NE-trending reverse/strike-slip faults, indicating a NW–SE compressive direction. Blocks in the Zhurihe mélange include ophiolitic fragments (c. 292 Ma) and ocean island sequences (c. 274 Ma), which show E-MORB and OIB geochemical affinities, respectively. The matrix includes blueschist, greenschist, quartz schist and clastics, of which the blueschist yielded a zircon U–Pb age of c. 255 Ma, and is geochemically E-MORB-like. The Erdaojing mélange north of the Solonker Suture is dominated by east–west-trending folds, and NE- and NW-trending reverse faults, indicating a north–south compressive orientation. The Erdaojing mélange is composed of early Permian (c. 281 Ma) ophiolite blocks, and middle Permian (c. 266 Ma) actinolite schist and clastics as the matrix. The Erdaojing ophiolitic rocks are geochemically N-MORB tholeiitic. Our results define two parallel Permian MORB-type ophiolitic belts separated by the central Solonker Suture. These observations are evidence for the Permian divergent double subduction and Early Triassic soft-collision model for the PAO along the Solonker Suture.

Supplementary material: Detailed analytical methods and results are available at: https://doi.org/10.6084/m9.figshare.c.5008910

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 177 (5)
Journal of the Geological Society
Volume 177, Issue 5
September 2020
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Anatomy of two Permian greenschist- to blueschist-facies tectonic mélanges in the Solonker Suture Zone (Inner Mongolia, northeastern China): evidence for divergent double subduction and soft collision

Huichuan Liu, Jichun Wang, Chun-Kit Lai, Yinglei Li, Jingfan Wang, Chongyu Song, Jiadong Zhang, Xin Zhao and Jiangdong Qin
Journal of the Geological Society, 177, 981-996, 8 July 2020, https://doi.org/10.1144/jgs2020-006
Huichuan Liu
1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), , China
Roles: [Conceptualization (Lead)], [Funding acquisition (Lead)], [Investigation (Lead)], [Resources (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Huichuan Liu
Jichun Wang
2Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-prospecting, , China
3Geological Survey Institute of Inner Mongolia Autonomous, , China
Roles: [Investigation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: 50027033@qq.com armourzjd@hotmail.com
Chun-Kit Lai
4Faculty of Science, Universiti Brunei Darussalam, , Brunei Darussalam
Roles: [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Chun-Kit Lai
Yinglei Li
5Institute of Mineral Resources, Chinese Academy of Geological Sciences, , China
6Key Laboratory of Orogen and Crust Evolution, Department of Geology, Peking University, , China
Roles: [Data curation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jingfan Wang
7Management Center of Exploration Fund of Inner Mongolia, , China
Roles: [Investigation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Chongyu Song
8Development and Research Center of China Geological Survey, , China
Roles: [Resources (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jiadong Zhang
8Development and Research Center of China Geological Survey, , China
Roles: [Investigation (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Xin Zhao
2Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-prospecting, , China
3Geological Survey Institute of Inner Mongolia Autonomous, , China
Roles: [Investigation (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jiangdong Qin
2Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-prospecting, , China
3Geological Survey Institute of Inner Mongolia Autonomous, , China
Roles: [Investigation (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Anatomy of two Permian greenschist- to blueschist-facies tectonic mélanges in the Solonker Suture Zone (Inner Mongolia, northeastern China): evidence for divergent double subduction and soft collision

Huichuan Liu, Jichun Wang, Chun-Kit Lai, Yinglei Li, Jingfan Wang, Chongyu Song, Jiadong Zhang, Xin Zhao and Jiangdong Qin
Journal of the Geological Society, 177, 981-996, 8 July 2020, https://doi.org/10.1144/jgs2020-006
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