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The rise and demise of the Paleogene Central Tibetan Valley.

ABSTRACT: Reconstructing the Paleogene topography and climate of central Tibet informs understanding of collisional tectonic mechanisms and their links to climate and biodiversity. Radiometric dates of volcanic/sedimentary rocks and paleotemperatures based on clumped isotopes within ancient soil carbonate nodules from the Lunpola Basin, part of an east-west trending band of basins in central Tibet and now at 4.7 km, suggest that the basin rose from <2.0 km at 50 to 38 million years (Ma) to >4.0 km by 29 Ma. The height change is quantified using the rates at which wet-bulb temperatures (T_w) decline at land surfaces as those surface rise. In this case, T_w fell from ~8°C at ~38 Ma to ~1°C at 29 Ma, suggesting at least ~2.0 km of surface uplift in ~10 Ma under warm Eocene to Oligocene conditions. These results confirm that a Paleogene Central Tibetan Valley transformed to a plateau before the Neogene.

SUBMITTER: Xiong Z

PROVIDER: S-EPMC8827648 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature

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The rise and demise of the Paleogene Central Tibetan Valley.

Xiong Zhongyu Z Liu Xiaohui X Ding Lin L Farnsworth Alex A Spicer Robert A RA Xu Qiang Q Valdes Paul P He Songlin S Zeng Deng D Wang Chao C Li Zhenyu Z Guo Xudong X Su Tao T Zhao Chenyuan C Wang Houqi H Yue Yahui Y

Science advances 20220209 6

Reconstructing the Paleogene topography and climate of central Tibet informs understanding of collisional tectonic mechanisms and their links to climate and biodiversity. Radiometric dates of volcanic/sedimentary rocks and paleotemperatures based on clumped isotopes within ancient soil carbonate nodules from the Lunpola Basin, part of an east-west trending band of basins in central Tibet and now at 4.7 km, suggest that the basin rose from <2.0 km at 50 to 38 million years (Ma) to >4.0 km by 29 M ...[more]

PMID: 35138908

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