Phased uplift of the northeastern Tibetan Plateau inferred from a pollen record from Yinchuan Basin, northwestern China.
Phased uplift of the northeastern Tibetan Plateau inferred from a pollen record from Yinchuan Basin, northwestern China.
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从银川盆地花粉记录推断青藏高原东北部的阶段性隆升
DOI：
10.1038/s41598-017-16915-z
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发表时间：
2017-12-21
影响因子：
4.6
通讯作者：
Shi W
中科院分区：
文献类型：
--
作者：
Li X;Hao Q;Wei M;Andreev AA;Wang J;Tian Y;Li X;Cai M;Hu J;Shi W
青藏高原的隆升对区域和全球气候都产生了重要影响。虽然有证据表明青藏高原在第四纪经历了隆升，但时间和幅度都没有得到很好的限制。然而，植被变化的长期沉积记录的增加提供了一个机会来重建隆升的时间。在这里，我们提供了银川盆地过去2.6 Ma的日期准确、高分辨率的花粉记录，该盆地被黄河切割，其源头位于青藏高原东北部。蒿/藜（A/C）比值的变化揭示了银川盆地在冰期-间冰期旋回中水分条件的变化，以及与全球逐渐变冷相一致的长期干旱化趋势。然而，云杉和冷杉的百分比的波动不同于那些的A/C比，我们认为，他们反映了高海拔地区的植被和环境的变化。Picea和Abies记录揭示了2.1和1.2Ma两个阶段的代表性增加，这可能表明青藏高原东北部的隆升阶段。这为青藏高原第四纪隆升的时间提供了独立的证据。
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 theArtemisia/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 ofPiceaandAbiesdiffer from those of the A/C ratio and we propose that they reflect changes in the vegetation and environment of high elevation areas. ThePiceaandAbiesrecords 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.