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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (1): 57-65.DOI: 10.7522/j.issn.1000-694X.2021.00196

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Geochronology of the typical sediments in the Badain Jaran Desert: the progress and issues

Hui Zhao1(), Hongyu Yang1,2, Xingfan Wang3, Keqi Wang1,2   

  1. 1.Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.College of Resources and Environment,University of Chinese Academy of Sciences,Benjing 100049,China
    3.College of Water Conservancy and Hydropower Engineering,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2021-07-02 Revised:2021-07-16 Online:2022-01-20 Published:2022-01-28

Abstract:

Several typical kinds of sediments in the Badain Jaran Desert, such as aeolian sand, lacustrine and alluvial sediments, compose the complex geomorphological landscapes in the desert. The ages of these sediments are the most direct evidences and basic data to explore the geomorphologic process and the mechanism in the Badain Jaran Desert. In this study, ages of several typical kinds of sediments published by previous studies are reviewed, mainly involving more than 380 14C and luminescence dating ages, which covered most of the periods from 170 ka to the present. The age data since 12 ka ago accounts for 55% of the whole data set, indicating that the current near-surface sediments in the Badain Jaran Desert were mainly deposited since the Holocene. In the Holocene since 12 ka, the age amount of aeolian sediment from 1 ka ago is absolutely dominant, which is consistent with the continuously flow of aeolian sand in the desert. The ages of calcareous roots and lacustrine sediments were mainly distributed during 6-9 ka B.P.. The alluvial sediments at the edge of the desert mainly occurred at 5-7 ka B.P., which is consistent with the warm and humid climate conditions in the middle Holocene at the boundary of the Asian Summer monsoon. During the period of 170-12 ka, the age distribution of the alluvial sediments was not regular due to the few studies. The ages of calcareous root were mainly at of 35 ka due to 14C dating saturation age. The lacustrine sediments were mainly distributed in two periods, 90-120 ka and 40-70 ka. The aeolian sand age in the desert is mainly distributed evenly between 45-95 ka. In this paper, the significance of these age distributions are discussed; and the issues that should be paid attention to in the future studies for the dating of the typical sediments in the Badain Jaran Desert are also mentioned.

Key words: Badain Jaran Desert, typical sediments, geochronology

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