Chronological, geochemical characteristics and tectonic evolution significance of the Sanyan eclogites in the Jinsha River suture zone, eastern Xizang

TANG Yuan; LI Yiduo; WANG Dongbing; HAN Mingming; LI Xin; LUO Liang

doi:10.12090/j.issn.1006-6616.2025053

Volume 31 Issue 4

Aug. 2025

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Article Navigation > Journal of Geomechanics > 2025 > 31(4): 557-575

TANG Y，LI Y D，WANG D B，et al.，2025. Chronological, geochemical characteristics and tectonic evolution significance of the Sanyan eclogites in the Jinsha River suture zone, eastern Xizang[J]. Journal of Geomechanics，31（4）：557−575 doi: 10.12090/j.issn.1006-6616.2025053

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Chronological, geochemical characteristics and tectonic evolution significance of the Sanyan eclogites in the Jinsha River suture zone, eastern Xizang

doi: 10.12090/j.issn.1006-6616.2025053

1.
Chengdu Center (Geosciences Innovation Center of Southwest China), China Geological Survey, Chengdu 610081, Sichuan, China
2.
Xi’an Northwest Non-ferrous Geophysical and Chemical Exploration Group Co., Ltd, Xi'an 710068, Shaanxi, China

Funds: This research is financially supported by the Geological Survey Projects of the China Geological Survey (Grant Nos. DD20240026 and DD20190053) and the National Natural Science Foundation of China (Grant No. 42230311).

More Information

Received: 2025-05-20
Revised: 2025-07-10
Accepted: 2025-07-11

Available Online: 2025-07-24

Published: 2025-08-28

Abstract

Abstract

Objective As a key component of the eastern Tethys tectonic domain, the Jinsha River–Ailao Mountain suture zone is widely recognized as a Paleo-Tethys orogenic belt. However, due to the lack of metamorphic studies on high-pressure/ultra-high-pressure rocks, the subduction-to-closure process of the oceanic crust and the subsequent collisional orogenic evolution remain poorly constrained. Methods Systematic field surveys, petrographic observations, zircon U–Pb dating, and whole-rock major and trace element analyses were carried out on the newly discovered eclogites in the Sanyan area of the Jinsha River suture zone in eastern Xizang (Tibet). Based on the degree of retrogressive metamorphism, major mineral assemblages, and textural features, the Sanyan eclogites are classified into four types: garnet–albite–actinolite schist, garnet–actinolite, garnet–amphibolite, and eclogite. Results Zircon U–Pb dating of two eclogite samples yields ²⁰⁶Pb/²³⁸U ages of 247±2 Ma and 246±1 Ma, respectively. These zircons feature low Th/U ratios, extremely low content of Nb, Ta, and HREE, and no obvious negative Eu anomalies. Therefore, the genesis of the zircons should be eclogite-facies metamorphism, with the ~246 Ma age representing the timing of eclogite-facies metamorphism. Conclusion The whole-rock major element analysis of 12 samples shows that the protoliths are picritic basalt–basalt, and the trace element characteristics reveal diverse tectonic settings of the protoliths, including ocean island basalt (OIB), normal mid-ocean ridge basalt (N-MORB), and enriched mid-ocean ridge basalt (E-MORB), suggesting that the Sanyan eclogites were mainly formed by subduction of Paleo-Tethys oceanic crust materials (ocean islands and mid-ocean ridge basalts). Significance Combining the previously obtained zircon U–Pb ages of eclogites and the Ar–Ar plateau ages of phengites, the complete closure of the Jinsha River Paleo-Tethys Ocean in the early Middle Triassic (T₂¹) is further constrained.
- Jinsha River suture zone,
- eclogite,
- subduction,
- Paleo-Tethys,
- Qinghai–Tibet Plateau,
- geochemistry

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