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Diachronous uplift of the Tibetan plateau starting 40?Myr ago

Nature volume 394, pages 769–773 (1998)Cite this article

Abstract

The uplift of the Tibetan plateau is generally regarded as a response to the convective removal of the lower portion of the thickened Asian lithosphere1. This removal is also thought to be responsible for the east–west extension2 that took place during the India–Asia collision. The timing of these events has been a subject of great interest for understanding mountain-building processes, collisional tectonics and the influence of these processes on climate change3,4. In western Tibet, potassic lavas related to east–west extension were found to have been extruded over the past 20?Myr (refs 5, 6). Here we report the widespread occurrence of magmas in eastern Tibet which show similar geochemical signatures to the potassic lavas to the west but formed 40–30?Myr ago. These magmatic activities suggest a diachronous uplift history for the Tibetan plateau, with the convective removal of the lower lithosphere inducing rapid uplift in the east beginning some 40?Myr ago and in the west about 20?Myr later. This observation is consistent with sedimentation records from the Ganges–Brahmaputra delta to the Bengal fan7,8 and can better account for the tectonically driven models for strontium isotope evolution in the ocean9 and global cooling10 over the past 40?Myr.

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Figure 1: Simplified tectonic map of area around the Tibetan plateau (shaded area).
Figure 2: Representative 40Ar-39Ar radiometric dating spectra.
Figure 3: Comparison of compositions of rocks from eastern and western Tibet.

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Acknowledgements

We thank A. Crawford, S.-s. Sun and F. Yang for suggestions on the earlier drafts, and N. Rogers and P. England for reviews which significantly improved this Letter. This study was supported by the National Science Council, Taiwan and the National Science Foundation, China.

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Authors and Affiliations

  1. Department of Geology, National Taiwan University, Taipei, Taiwan

    Sun-Lin Chung, Ching-Hua Lo, Kuo-Lung Wang & Pei-Ling Wang

  2. Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan

    Tung-Yi Lee

  3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong

    Yuquan Zhang, Yingwen Xie & Xianhua Li

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  1. Sun-Lin Chung
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Correspondence to Sun-Lin Chung.

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Chung, SL., Lo, CH., Lee, TY. et al. Diachronous uplift of the Tibetan plateau starting 40?Myr ago. Nature 394, 769–773 (1998). https://doi.org/10.1038/29511

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