EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Early Eocene rapid exhumation record in the region of Nima, central Tibet, as determined by low-temperature thermochronology

Weiwei Xue1, Yani Najman2, Xiumian Hu1, Cristina Persano3, Finlay M. Stuart4, Wei Li1, and Ying Wang5
Weiwei Xue et al.
  • 1Nanjing university, School of Earth Sciences and Engineering , China (
  • 2Lancaster Environment Centre, Lancaster University, Lancaster, UK
  • 3School of Geographical and Earth Sciences, College of Science and Engineering, University of Glasgow, Glasgow, Scotland
  • 4Scottish Universities Environmental Research Centre, East Kilbride, Scotland
  • 5State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China

Knowledge of the geological history of the Tibetan plateau is critical to understanding crustal deformation process, and the plateau’s influence on climate. However, the timing of Tibetan plateau development remains controversial. The Nima Basin along the Jurassic-Cretaceous Bangong Suture in central Tibet provides well-dated records of exhumation in this area. Here, we present detrital zircon U-Pb, apatite U-Th/He (AHe) and apatite fission track data (AFT) from upper Cretaceous and Oligocene red sandstones and conglomerates in the Nima Basin, as well as from the Xiabie granite in the hanging wall of the basin-bounding Muggar Thrust. 4 granite conglomerate clasts from the above yield zircon U-Pb ages ranging between 114-122 Ma, which likely come from the Xiabie granite. 7 granitoid/sandstone conglomerate clasts yield AHe ages ranging from 21-58 Ma, while AFT ages range from 34-83 Ma. Thermal history inversion modelling for five of the above samples show a consistent rapid cooling from 100 ℃ to 30 ℃ between 50-40 Ma, the cooling rate decreased significantly after 40 Ma. Implications of these data, integrated in the context of previously published data for the wider region (e.g. Rohrmann et al. 2012; Haider et al., 2013; Li et al., 2019) will be discussed.



Rohrmann, A et al., 2012, Thermochronologic evidence for plateau formation in central Tibet by 45 Ma: Geology, v. 40, p. 187-190.

Haider, V. L et al., 2013, Cretaceous to Cenozoic evolution of the northern Lhasa Terrane and the Early Paleogene development of peneplains at Nam Co, Tibetan Plateau: Journal of Asian Earth Sciences, v. 70-71, p. 79-98.

Li, H. A et al., 2019, The formation and expansion of the eastern Proto-Tibetan Plateau: Insights from low-temperature thermochronology: Journal of Asian Earth Sciences, v. 183, 103975.

How to cite: Xue, W., Najman, Y., Hu, X., Persano, C., Stuart, F. M., Li, W., and Wang, Y.: Early Eocene rapid exhumation record in the region of Nima, central Tibet, as determined by low-temperature thermochronology, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-5082,, 2020


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