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Phased uplift of the northeastern Tibetan Plateau inferred from a pollen record from Yinchuan Basin, northwestern China

Xinling LiCollege of Resource, Environment and Tourism, The Capital Normal University, Beijing, 100048, ChinaQingzhen HaoCollege of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China. [email protected]Mingjian WeiCollege of Resource, Environment and Tourism, The Capital Normal University, Beijing, 100048, China. [email protected]Andrei AndreevInstitute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, Cologne, 50674, Germany. [email protected]Junping WangCollege of Resource, Environment and Tourism, The Capital Normal University, Beijing, 100048, ChinaYanyan TianCollege of Resource, Environment and Tourism, The Capital Normal University, Beijing, 100048, ChinaXiaolei LiCollege of Resource, Environment and Tourism, The Capital Normal University, Beijing, 100048, ChinaMaotang CaiInstitute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, ChinaJianmin HuInstitute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, ChinaWei ShiInstitute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China

2017en

ABI

Annotatsiya

The uplift of the Tibetan Plateau (TP) significantly affected both regional and global climates. Although there is evidence that the Tibetan Plateau experienced uplift during the Quaternary, the timing and amplitude are poorly constrained. However, the increased availability of long sedimentary records of vegetation change provides an opportunity to reconstruct the timing of the uplift. Here, we present a well-dated, high-resolution pollen record for the last 2.6 Ma from the Yinchuan Basin, which was incised by the Yellow River with its source in the northeastern Tibetan Plateau. Variations in the Artemisia/Chenopodiaceae (A/C) ratio of the reveal changes in moisture conditions in the Yinchuan Basin during glacial-interglacial cycles, as well as a gradual long-term aridification trend which is consistent with progressive global cooling. However, fluctuations in the percentages of Picea and Abies differ from those of the A/C ratio and we propose that they reflect changes in the vegetation and environment of high elevation areas. The Picea and Abies records reveal two phases of increased representation, at 2.1 and 1.2 Ma, which may indicate phases in the uplift of the northeastern Tibetan Plateau. Thus, they provide independent evidence for the timing of the uplift of the Tibetan Plateau during the Quaternary.

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DOI: 10.1038/s41598-017-16915-z

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