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August 16, 2026Journal of Petrology

Petrogenesis of a Triassic Magmatic Suite in the West Kunlun, northwest Tibetan Plateau: Implications for the Geodynamic Evolution of the Paleo-Tethys Ocean

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Authors

FYFan YangJYJiyuan YinZYZhiming Yang

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Overview

Geochemical analysis reveals a two-stage subduction model in the West Kunlun Orogenic Belt, indicating slab rollback drove late Triassic magmatism.

Key Points

  • To determine the petrogenesis of the Muztaga and Taer plutons in the West Kunlun Orogenic Belt and reconstruct the geodynamic evolution of the Paleo-Tethys oceanic subduction system.
  • Conducted zircon U-Pb geochronology, in-situ zircon Hf-O isotope analysis, and mineral chemistry on mafic dikes, microgranular mafic enclaves, gabbroic diorites, and granites.
  • Performed whole-rock major- and trace-element geochemical characterization alongside Sr-Nd-Pb isotopic analyses and mineral geobarometry modeling.
  • Mafic-to-intermediate lithologies crystallized between ca. 233 and 223 Ma with enriched lithospheric mantle signatures, including whole-rock (87Sr/86Sr)i of 0.7058 to 0.7071 and εNd(t) of –3.5 to –3.0.
  • Granitoids crystallized between ca. 244 and 216 Ma with I-type characteristics, showing whole-rock (87Sr/86Sr)i of 0.7070 to 0.7085, εNd(t) of –4.31 to –3.53, and δ18Ozrn of 6.28‰ to 7.51‰ consistent with ancient crustal remelting.
  • Identified a geodynamic shift from Early Triassic flat-slab subduction to slab rollback at ca. 223 Ma, which induced crustal extension, extensive arc magmatism, and final ocean closure.

Cite This Study

Yang et al. (2026) studied this question.

synapsesocial.com/papers/6a8179bcf2fb91fc834ad0f4https://doi.org/10.1093/petrology/egag069
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Geodynamic Evolution of the Proto-Tethys Ocean in the West Kunlun Orogenic Belt, NW Tibet: Implications from the Sub-Arc Crust and Lithospheric Mantle Modification2024 · 2 citations
  2. 2Back-arc magmatism of the Proto-Tethys Ocean in the West Kunlun Orogenic Belt: evidence from the Ordovician Nanpingxueshan Nb-enriched gabbros2024
  3. 3Petrogenesis and tectonic implications of the late Triassic gabbro in southern East Kunlun Orogenic Belt, northern Tibetan Plateau2024
  4. 4Geochemical and petrological diversity of a transcrustal magmatic system driven by mushy magma mixing: Insights from the Triassic dike swarms in East Kunlun orogen, northern Tibetan Plateau2024 · 6 citations
  5. 5Paleozoic Tectonic Transition from Arc–Continent Collision to Post-Orogenic Extension in the East Kunlun Orogen: Constraints from Metamorphic Events2026