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Impact of phased uplift of Tibetan Plateau on
environmental changes since late Middle Pleistocene: Palynological
records in the three terraces of Middle Shiquan River |
| Rongke XU1,Xiongfei CAI1,Yulian ZHANG1,Liang SHAN1,Yaoyu CHEN2,Jianhong QI2,Gang WANG3, |
| 1.Key Laboratory of Biogeology
and Environmental Geology of Ministry of Education, China University
of Geosciences, Wuhan 430074, China; 2.No.3 Institute of Geology
and Resources of Gansu, Lanzhou 730050, China; 3.Xizang Institute of
Geology and Resources, Lhasa 850000, China; |
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Abstract Three fluvial terraces in Porougong River in the middle reach of Shiquan River were identified, and the palynological records were investigated to decipher the paleoenvironmental changes in the west inland of the Tibetan Plateau. Three phases of uplift in the west inland of the Tibetan Plateau are suggested to be associated with the third, second, and first fluvial terraces (T3, T2, and T1) being formed at ca.126―25.1 ka B.P., 25.1―4.5 ka B.P., and 4.5―1.3 ka B.P., respectively. The differentiated uplift rate infers that the inland Tibetan Plateau shows an earlier uplift than the surroundings. Coincident with the phased uplift, three episodes of the changes in paleovegetation and paleoclimate since late Middle Pleistocene could be identified by the spore–pollen records, including the forests under the warm–wet climate featured by the assemblage of Picea + Pinus–Betula–Ulmus–Chenopodiaceae–Epheara in the third terrace, the forest–grassy vegetation under the semi–arid and semi–wet climate as shown by the Picea + Pinus–Chenopodiaceae–Epheara assemblage in the second terrace, and the grassland under the cold–dry climate indicated by the Chenopodiaceae–Artemisia–Ephedra assemblage in the first terrace. The association of the paleovegetation and paleoclimate changes with the phased uplift of the fluvial terraces has revealed the important impact of the Plateau uplift.
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| Keywords
fluvial terrace
western inland of Tibetan Plateau
phased uplift
spore–pollen assemblages
environmental changes
late Middle Pleistocene
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Issue Date: 05 December 2009
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