作　　者： ; ; ; ;

机构地区： 华南师范大学地理科学学院地理科学系

出　　处： 《华南师范大学学报（自然科学版）》 2004年第1期129-135,共7页

摘　　要： 位于毛乌素沙漠东南的萨拉乌苏河流域米浪沟湾剖面末次间冰期层系记录了8 5个古风成砂与河湖相和古土壤构成的显著的粗细韵律交替变化粒度旋回.通过对不同沉积相粒度的一般分布特征尤其是粒度参数-Mz、σ、Sk、Kg和SC/D值以及该地生物化石指示的古环境综合分析,认为所述粒度旋回主要是东亚冬夏古代季风交替影响下的气候旋回波动所致. Situated in the Salawusu River Valley, the southeast of the Mu Us Desert, The last interglacial succession of strata in the Milanggouwan stratigraphical section keep a record of 8.5 sedimentary cycles of alternate coarse and fine evolution of the aeolian dune layers with the fluvio-lacustrine facies and palaeosols in grain-size. By analyzing the general characteristics of the grain-size distribution of different sedimentary facies, especially the variations of the parameters Mz(mean particle diameter),σ(standard deviation),Sk(bias angle), Kg(kurtosis) and SC/D(ratio of the sum of silt and clay to sand), and also analyzing the biological fossil reflecting the palaeo-environment, it is shown that the sedimentary cycles in grain-size resulted from the climate fluctuations under the alternate evolution of the ancient winter and summer monsoons of East Asia during the Last Interglacial period.

关 键 词： 萨拉乌苏河流域 末次间冰期 粒度旋回 气侯旋回 沉积相粒度

领　　域： [天文地球] [天文地球]