Journal
JOURNAL OF ASIAN EARTH SCIENCES
Volume 224, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2021.105023
Keywords
Northeastern Tibetan Plateau; Neogene; Tectonic -sedimentary; Magnetostratigraphy; Aridification
Categories
Funding
- China Geological Survey (CGS) [DD20190018]
- National Natural Science Foundation of China (NSFC) [41672203]
- Natural Science Foundation of Shaanxi Province [2021JQ-240, 10.13140/RG.2.2.28453.93921]
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The basin deposits of the northeastern Tibetan Plateau provide a valuable record for studying the plateau uplift and aridification in NW China. This study on drill core WW-01 in the Wuwei Basin reveals a long depositional-paleoenvironmental history from approximately 11.15 Ma to present, with significant changes in sedimentary environment and accumulation rate at around 8.25 and 2.58 Ma.
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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