摘要
以在萨拉乌苏河流域近年命名的“米浪沟湾地层剖面”作为河套东南的理想剖面 ,描述了其地层特征、讨论了地层磁化率值和粒度分布与气候变迁的关系。研究指出 ,该剖面记录了 15 0kaBP以来毛乌素沙漠 2 7个旋回的砂丘与河湖相和古土壤互为交替的演化历史 ;剖面风成砂丘的堆积时期和河湖相或古土壤发育时期分别主要与过去冬季风和夏季风作用加强有关。根据中国沙漠及黄土区现代沙尘暴发生的区域特征认为 ,米浪沟湾剖面记录的15 0ka来的 2 7次砂丘期代表了中国沙区存在 2 7个沙漠堆积时期。
Taking 'Milanggouwan section' located in the Salawusu River valley termed in recent years as an ideal profile in the southeastern margin of Ordos Plateau, the stratigraphic characteristics in the section and the relation between the stratigraphical magnetic susceptibility values, grain-size distributions and climatic changes have been discussed in this paper. It is pointed by studies out that the section takes down 27 cycles of alternately evolutionary histories of desert depositions in the Mu Us Desert with the fluvio-lacustrine facies and palaeosols since 150 ka BP and that the sedimentary periods of the aeolian dune and fluvio-lacustrine facies or palaeosol are chiefly apart related to intensifying winter monsoon and summer monsoon. Based on the regional feature that the contemporary sand-dust storm take place, it is considered that the 27 periods of dune accumulations recorded in Milanggouwan section represent 27 periods of desert deposition in China in past 150 ka.
出处
《中国沙漠》
CSCD
北大核心
2001年第4期346-353,共8页
Journal of Desert Research
基金
国家自然科学基金项目 ( 4 99710 0 9)
中科院地球环境研究所黄土与第四纪地质国家重点实验室项目 (SKLLQG0 0 0 8)
国家重点基础研究发展规划项目 (G2 0 0 0 0 4870 0 )资助
关键词
米浪沟湾
地层剖面
风成砂丘堆积
地层磁化率
沙尘暴
中国
沙漠环境变迁
Milanggouwan
stratigraphical section
past 150 ka
27 periods of aeolian dunes
desert environmental vicissitude of China
