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中国沙漠 ›› 2022, Vol. 42 ›› Issue (1): 57-65.DOI: 10.7522/j.issn.1000-694X.2021.00196

• • 上一篇    下一篇

巴丹吉林沙漠典型沉积物年代学研究评述

赵晖1(), 杨宏宇1,2, 王兴繁3, 汪克奇1,2   

  1. 1.中国科学院西北生态环境资源研究院 沙漠与沙漠化重点实验室,甘肃 兰州 730000
    2.中国科学院大学 资源与环境学院,北京 100049
    3.甘肃农业大学 水利水电工程学院,甘肃 兰州 730070
  • 收稿日期:2021-07-02 修回日期:2021-07-16 出版日期:2022-01-20 发布日期:2022-01-28
  • 作者简介:赵晖(1973—),男,山西忻州人,研究员,主要从事释光年代学和环境演化研究。E-mail: hzhao@lzb.ac.cn
  • 基金资助:
    国家自然科学基金项目(41771016)

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

摘要:

巴丹吉林沙漠内几种典型近地表沉积物,如风成沙、湖相沉积、冲洪积物等构成了巴丹吉林沙漠复杂多变的地貌景观。这些典型沉积物的年龄是探讨巴丹吉林沙漠地貌过程及其机理的最直接证据和基础数据。前人发表的这几种典型沉积物年龄,主要涉及380余个14C年龄和释光年龄,这些数据涵盖了170 ka至今的大部分时段。其中12 ka以来年龄数据占55%,说明巴丹吉林沙漠目前的近地表沉积物主要发育于全新世以来。在12 ka以来的全新世,对风成沙沉积来说,近1 ka以来的近现代年龄数量占绝对优势,与沙漠内风成沙不断流动一致;而钙质根管与湖相沉积主要分布在距今6—9 ka; 沙漠边缘的冲洪积物则主要出现在距今5—7 ka,这与季风边缘中全新世暖湿的气候条件一致。在170-12 ka这一时段,洪积物由于目前研究较少,年龄分布没有规律;钙质根管由于测年手段主要使用14C方法,年龄主要分布在35 ka左右的饱和年龄;湖相沉积物主要分布在90—120 ka和40—70 ka两个时段;而沙漠内的风成沙年代主要均匀分布在45—95 ka。本文讨论了这些年龄分布规律的意义以及今后巴丹吉林沙漠典型沉积物测年应注意的问题。

关键词: 巴丹吉林沙漠, 典型沉积物, 年代学

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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