1.08 Ma以来中国东北赤峰地区黄土粒度变化及其揭示的沙地扩张事件

doi:10.7522/j.issn.1000-694X.2017.00048

中国沙漠

2017, Vol. 37

Issue (4): 659-665 DOI: 10.7522/j.issn.1000-694X.2017.00048

古气候与环境演变

1.08 Ma以来中国东北赤峰地区黄土粒度变化及其揭示的沙地扩张事件

吕安琪¹, 鹿化煜^1,2, 曾琳¹, 弋双文¹, 卓海昕¹, 徐志伟¹, 张文超¹

1. 南京大学地理与海洋科学学院, 江苏南京 210023;
2. 中国科学院青藏高原地球科学卓越创新中心, 北京 100101

Evolution of Horqin and Otindag Dune Fields since 1.08 Ma Recorded by Grain Size of Loess in Chifeng,Northeastern China

Lyu Anqi¹, Lu Huayu^1,2, Zeng Lin¹, Yi Shuangwen¹, Zhuo Haixin¹, Xu Zhiwei¹, Zhang Wenchao¹

1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;
2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China

全文: PDF(3703 KB)

摘要： 科尔沁和浑善达克沙地周边沉积了中国东北地区目前已知的保存完好、沉积年代最久远的黄土，是研究区域干旱化过程和沙地演化的理想材料。通过对内蒙古自治区赤峰市附近约1.08 Ma以来约60 m厚黄土剖面的高分辨率粒度分析，发现该地区黄土具有典型风成沉积特征，并且其沉积过程受东亚季风在冰期-间冰期周期性变化影响。由于距离粉尘源区较近，这些黄土序列记录了中更新世以来冬季风增强导致的源区沙漠/沙地的阶段性干旱化和发生于~670 ka和~943 ka的两次沙漠/沙地扩张事件。新揭示的干旱化事件与中国西部-中部的环境演变过程一致，可能是中更新世气候转型时期阶段性全球冰量增加、温度降低驱动中国东北地区更新世气候演化的结果。

关键词： 中国东北; 科尔沁沙地; 浑善达克沙地; 黄土; 粒度; 冬季风

Abstract: Extensive loess deposits that mantle on various landscapes are found in the adjacent areas of the Horqin and Otindag dune fields,which should record the aridificaion history and desert evolution in Northeastern China.Here,we present a high-resolution grain-size analysis of a 59.9-m-thick loess-paleosol sequence in the south margin of Horqin and Otindag sand fields that covers the ca.1.08 Myr (1 080 kyr).The grain-size distribution of these loess deposits shows typical features of aeolian deposits,and records the cyclical variations of the East Asian winter monsoon and dune fields during glacial-interglacial cycles.It also demonstrates a long-term drying trend caused by the strengthening East Asian winter monsoon in Northeastern China since ca.1.08 Ma.The Horqin and Otindag dune fields expanded in ca.670 ka and ca.943 ka.These drying events correspond with other records in the western and central China.It may reflect that the increase of northern hemisphere ice volume and global cooling should have forced the stepwise aridification and caused dune field extension to the Southeast China since the Mid-Pleistocene Transition Event.

Key words: Northeastern China Horqin dune field Otindag dune field loess grain size winter monsoon

收稿日期: 2017-04-05 出版日期: 2017-07-20

P531

基金资助: 国家自然科学基金重大项目（41690111）；国家重点研发计划项目（2016YFA0600503； 2016YFE0109500）。

通讯作者: 鹿化煜(E-mail:huayulu@nju.edu.cn) E-mail: huayulu@nju.edu.cn

作者简介: 吕安琪(1994-),女,黑龙江哈尔滨人,硕士研究生,从事自然地理学研究。E-mail:geolvanqi@163.com

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引用本文:

吕安琪, 鹿化煜, 曾琳, 弋双文, 卓海昕, 徐志伟, 张文超. 1.08 Ma以来中国东北赤峰地区黄土粒度变化及其揭示的沙地扩张事件[J]. 中国沙漠, 2017, 37(4): 659-665.

Lyu Anqi, Lu Huayu, Zeng Lin, Yi Shuangwen, Zhuo Haixin, Xu Zhiwei, Zhang Wenchao. Evolution of Horqin and Otindag Dune Fields since 1.08 Ma Recorded by Grain Size of Loess in Chifeng,Northeastern China. JOURNAL OF DESERT RESEARCH, 2017, 37(4): 659-665.

链接本文:

http://www.desert.ac.cn/CN/10.7522/j.issn.1000-694X.2017.00048 或 http://www.desert.ac.cn/CN/Y2017/V37/I4/659

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