磁性地层学
地质学
沉积学
高原(数学)
干旱化
古生物学
构造隆升
构造盆地
沉积沉积环境
新生代
沉积岩
第四纪
历时的
地貌学
地球化学
数学
数学分析
干旱
作者
Zhenyu Zhao,Wei Shi,Yong Yang,Maotang Cai,Changfeng Liu,Xiaobo Liu,Tianyu Wang,Yuanfang Zhao,Qian Yang
标识
DOI:10.1016/j.jseaes.2021.105023
摘要
Basin deposits of the northeastern Tibetan Plateau provide an ideal record for understanding the uplift of the plateau and the history of aridification in NW China. In this study, we present sedimentology, magnetostratigraphy, and paleoenvironmental indexes from the drill core WW-01 in the Wuwei Basin in the northeastern Tibetan Plateau to reconstruct a long depositional–paleoenvironmental history spanning from ca. 11.15 Ma to the present. Firstly, ages of the Fengle Formation, Guoyuan Formation, and Quaternary sediments are precisely defined through the magnetostratigraphy study of the drill core WW-01. Our results show that the upper age limit of Fengle Formation is 8.25 Ma, Guoyuan Fromation ranges from 8.25 to 2.58 Ma, and the Quaternary sediments span the interval from 2.58 Ma to the present. Secondly, detailed analysis of the sedimentology of the drill core reveals that marked changes in sedimentary environment and accumulation rate occurred at ca. 8.25 and 2.58 Ma, respectively. Our results, combined with regional research, indicate that the initial uplift of the northeastern Tibetan Plateau started at ca. 8.25 Ma and that the latest phase of rapid uplift occurred at ca. 2.58 Ma. In addition, the changes of grain size and magnetic susceptibility in the sediments of the drill core combined with knowledge of the regional paleoenvironment evolution show that NW China underwent gradual aridification from the late Miocene (ca. 8.25 Ma), which is consistent with global cooling at that time. However, tectonic uplift of the northeastern Tibetan Plateau may have been the primary driving force of the aridification between ca. 8.25 and 7.14 Ma.
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