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<p>The timing and mechanisms of deformation along the northwestern Tibetan Plateau remain poorly constrained. Here we present new low-temperature thermochronological data from the western Songpan-Ganzi terrane, a key yet understudied region of the plateau interior. Apatite fission track and zircon and apatite (U-Th)/He ages cluster in the late Eocene-Oligocene, and thermal history modeling indicates moderate to rapid cooling and exhumation during this interval, followed by limited post-Oligocene cooling. These results suggest that deformation and exhumation were primarily concentrated in the late Eocene-Oligocene, with subsequent limited cooling and exhumation across the high-elevation, low-relief plateau interior. In contrast, younger cooling ages from the West Kunlun Mountains indicate that Neogene deformation and exhumation were localized along the plateau margin. Together, these observations highlight strongly diachronous deformation histories across northern Tibetan Plateau and provide new constraints on the spatiotemporal evolution of plateau development.</p>

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Late Eocene to Oligocene intracontinental deformation and growth of the northwestern Tibetan Plateau

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月1日

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  • Zhiyuan He,
  • He Wang,
  • Shida Song,
  • Zhenhong Wang,
  • Zhongyu Xiong,
  • Xiaoming Shen,
  • Stijn Glorie,
  • Yong Liang,
  • Linglin Zhong,
  • Johan De Grave

摘要

The timing and mechanisms of deformation along the northwestern Tibetan Plateau remain poorly constrained. Here we present new low-temperature thermochronological data from the western Songpan-Ganzi terrane, a key yet understudied region of the plateau interior. Apatite fission track and zircon and apatite (U-Th)/He ages cluster in the late Eocene-Oligocene, and thermal history modeling indicates moderate to rapid cooling and exhumation during this interval, followed by limited post-Oligocene cooling. These results suggest that deformation and exhumation were primarily concentrated in the late Eocene-Oligocene, with subsequent limited cooling and exhumation across the high-elevation, low-relief plateau interior. In contrast, younger cooling ages from the West Kunlun Mountains indicate that Neogene deformation and exhumation were localized along the plateau margin. Together, these observations highlight strongly diachronous deformation histories across northern Tibetan Plateau and provide new constraints on the spatiotemporal evolution of plateau development.