Lower Cretaceous turbidites in the Shiquanhe-Namco Ophiolite Mélange Zone, Asa area, Tibet: Constraints on the evolution of the Meso-Tethys Ocean

Xiao-Wen Zeng; Ming Wang; Cai Li; Hang Li; Xian-Jin Zeng; Di Shen

doi:10.1016/j.gsf.2020.12.008

Volume 12 Issue 4

Jul. 2021

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Xiao-Wen Zeng, Ming Wang, Cai Li, Hang Li, Xian-Jin Zeng, Di Shen. Lower Cretaceous turbidites in the Shiquanhe-Namco Ophiolite Mélange Zone, Asa area, Tibet: Constraints on the evolution of the Meso-Tethys Ocean[J]. Geoscience Frontiers, 2021, 12(4): 101127. doi: 10.1016/j.gsf.2020.12.008

Citation:

Xiao-Wen Zeng, Ming Wang, Cai Li, Hang Li, Xian-Jin Zeng, Di Shen. Lower Cretaceous turbidites in the Shiquanhe-Namco Ophiolite Mélange Zone, Asa area, Tibet: Constraints on the evolution of the Meso-Tethys Ocean[J]. Geoscience Frontiers, 2021, 12(4): 101127. doi: 10.1016/j.gsf.2020.12.008

Citation:

Xiao-Wen Zeng, Ming Wang, Cai Li, Hang Li, Xian-Jin Zeng, Di Shen. Lower Cretaceous turbidites in the Shiquanhe-Namco Ophiolite Mélange Zone, Asa area, Tibet: Constraints on the evolution of the Meso-Tethys Ocean[J]. Geoscience Frontiers, 2021, 12(4): 101127. doi: 10.1016/j.gsf.2020.12.008

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Lower Cretaceous turbidites in the Shiquanhe-Namco Ophiolite Mélange Zone, Asa area, Tibet: Constraints on the evolution of the Meso-Tethys Ocean

doi: 10.1016/j.gsf.2020.12.008

a College of Earth Sciences, Jilin University, Changchun 130062, China;
b Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources of China, Changchun 130062, China

Funds:

We thank the Professor Inna Safonova (associated editor) and two anonymous reviewers for their encouragement, comments, and suggestions throughout the preparation of this manuscript. We appreciate Dr. Xie Chao-Ming, Dr. Fan Jian-Jun, Mr. Wang Bin, Mr. Luo An-Bo for their help in the field. Hao Yu-Jie is thanked for the LA-ICP-MS zircon U-Pb dating analysis. We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript. This research was supported by the National Natural Science Foundation of China (Grant No.41402190 and 41602230), the Program of China Geological Survey (Grant No.121201010000150014 and DD20160026) and Opening Foundation of Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources (DBY-ZZ-18-06).

Received Date: 2020-01-02
Rev Recd Date: 2020-11-09
Publish Date: 2021-07-17

Abstract

Abstract

Turbidites from the Shiquanhe-Namco Ophiolite Mélange Zone (SNMZ) record critical information about the tectonic affinity of the SNMZ and the evolutionary history of the Meso-Tethys Ocean in Tibet. This paper reports sedimentologic, sandstone petrographic, zircon U-Pb geochronologic, and clastic rocks geochemical data of newly identified turbidites (Asa Formation) in the Asa Ophiolite Mélange. The youngest ages of detrital zircon from the turbiditic sandstone samples, together with ~115 Ma U-Pb concordant age from the tuff intercalation within the Asa Formation indicate an Early Cretaceous age. The sandstone mineral modal composition data show that the main component is quartz grains and the minor components are sedimentary and volcanic fragments, suggesting that the turbidites were mainly derived from a recycled orogen provenance with a minor addition of volcanic arc materials. The detrital U-Pb zircon ages of turbiditic sandstones yield main age populations of 170-120 Ma, 300-220 Ma, 600-500 Ma, 1000-700 Ma, 1900-1500 Ma, and ~2500 Ma, similar to the ages of the Qiangtang Terrane(age peak of 600-500 Ma, 1000-900 Ma, ~1850 Ma and ~2500 Ma) and the accretionary complex in the Bangong-Nujiang Ophiolite Zone (BNMZ) rather than the age of the Central Lhasa Terrane (age peak of ~300 Ma, ~550 Ma and ~1150 Ma). The mineral modal compositions, detrital U-Pb zircon ages, and geochemical data of clastic rocks suggest that the Asa Formation is composed of sediments primarily recycled from the Jurassic accretionary complex within the BNMZ with the secondary addition of intermediate-felsic island arc materials from the South Qiangtang Terrane. Based on our new results and previous studies, we infer that the SNMZ represents a part of the Meso-Tethys Suture Zone, rather than a southward tectonic klippe of the BNMZ or an isolated ophiolitic mélange zone within the Lhasa Terrane. The Meso-Tethys Suture Zone records the continuous evolutionary history of the northward subduction, accretion, arc-Lhasa collision, and Lhasa-Qiangtang collision of the Meso-Tethys Ocean from the Early Jurassic to the Early Cretaceous.
- Tibet,
- Shiquanhe-Namco Ophiolite Mé,
- lange Zone,
- Early Cretaceous,
- Sedimentary provenance,
- Tectonic Affinity,
- Meso-Tethys Ocean

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References(119)

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