Provenance variations of the Tengger Desert since 2.35 Ma and its linkage with the Northern Tibetan Plateau: Evidence from U-Pb age spectra of detrital zircons
Provenance variations of the Tengger Desert since 2.35 Ma and its linkage with the Northern Tibetan Plateau: Evidence from U-Pb age spectra of detrital zircons
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2.35 Ma以来腾格里沙漠物源变化及其与藏北高原的联系——来自碎屑锆石U-Pb年龄谱的证据
DOI：
10.1016/j.quascirev.2019.105916
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发表时间：
2019-11
影响因子：
4
通讯作者：
Chen Fahu
中科院分区：
文献类型：
--
作者：
Fan Yuxin;Li Zhenjun;Wang Fei;Ma Jun;Mou Xuesong;Li Xiaohu;Zhang Qingsong;Zhao Hui;Chen Fahu
黄土高原近缘沙漠沉积物源变化的认识对于了解风成过程中物源区与下风向沉积区之间的环境变化具有重要意义。此外，它还可以揭示青藏高原隆升的历史。然而，CLP的近端沙漠的种源的长期变化仍然是未知的。腾格里沙漠（TD）是CLP上风的近端沙漠之一。它位于青藏高原北方东北缘的一个洼地（也是一个高原）上，阿尔泰山戈壁以南。本文报道了采自塔里木盆地西北部BJ 14孔11个砂层的碎屑锆石U-Pb年龄谱。砂层的年龄为2.35 ~ 0.11Ma。结果表明：（1）大湄公河次区域和西北太平洋地区是两个竞争的沙物源区。(2)2.35-1.80和1.2- 0.6Ma时，碎屑物源区主要为GAM，1.56和0.36- 0.11Ma时主要为NTP。青藏高原的阶段性隆升控制了青藏高原东缘主要物源区由大暖期向北暖期的转移。(3)NTP沉积贡献的相对增加与风成沙/沙尘沉积的积累速率和下风向面积的增加基本同步，但这种增加开始于青藏高原阶段性隆升的后期。这些研究结果表明，NTP的阶段性快速隆起是一个触发器，占主导地位的近端沙漠的CLP和超越的物源的变化。
Knowledge of variations of the sedimentary sources of the proximal deserts of the Chinese Loess Plateau (CLP) is important for understanding eolian processes linking environmental changes within provenance areas and the areas of deposition downwind. In addition, it may shed light on the history of the uplift of the Tibetan Plateau. However, the long-term variations in provenance of the proximal deserts of the CLP are still unknown. The Tengger Desert (TD) is one of the proximal deserts upwind of the CLP. It is located in a depression (also a plateau) on the northeastern margin of the Northern Tibetan Plateau (NTP) and to the south of the Gobi Altay Mountains (GAMs). Here, we present U-Pb age spectra of detrital zircon grains from 11 sand layers from core BJ14 which was drilled in the northwestern part of the TD. The ages of the sand layers range from 2.35 to 0.11 Ma. The results indicate that: (1) The GAMs and NTP were two competing provenance areas of sands in the TD. (2) The dominant provenance area of clastic materials in the TD area was GAMs during 2.35–1.80 and 1.2–0.6 Ma, and the NTP at ∼1.56 Ma and during 0.36–0.11 Ma. The shift in the dominant provenance area in the TD from the GAMs to the NTP was controlled by the phased uplift of the Tibetan Plateau against the background of global cooling. (3) The relative increase of the sedimentary contribution from the NTP was generally synchronous with increases in the accumulation rate and the enlargement of eolian sand/dust deposits downwind, but the increase began at a late stage in the phased uplift of the Tibetan Plateau. These findings indicate that the phased rapid uplift of the NTP was a trigger which dominated the variations in the provenance of the proximal deserts of the CLP and beyond.
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