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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。
In this paper, we describe the stratigraphic features of the “Meilanggouwan stratigraphic section” named in recent years in the Salawusu River basin as the ideal section of the southeastern Loop and discuss the relationship between the susceptibility value and the particle size distribution of stratigraphy and climate change. The study shows that the profile recorded 27 alternating cycles of evolution between the 27 sagbacks of the Mu Us Desert and the lacustrine and lacustrine facies and the paleosol since 15 0 kbd. The accumulation period of the aeolian sands and the periods of lacustrine facies or palaeosol development It has something to do with the past winter monsoon and summer monsoon. According to the regional characteristics of the modern sandstorms in the deserts and loess regions of China, the 27 sand mounds recorded from the Mi Longgou section in 15 0 ka represent the existence of 27 desert depositional stages in the sand regions of China.