摘要
在传统认为属河湖相沉积的萨拉乌苏组,经研究在其上部划分出一套以风成砂沉积为主的城川组。城川组风成砂与马兰黄土是同期风力分异出来的产物;城川组的沉积相、沉积环境和古生物与其下的萨拉乌苏组是不同的。萨拉乌苏河流域的城川组,马兰黄土形成于晚更新世晚期,萨拉乌苏组为晚更新世早期;前者相当于玉木冰期,推测年代距今70000a。
In the reaches of the Salawusu River of northern China, the upper part of thetransitional Salawusu Formation is considered through studies to be the ChengchuanFormation composed mainly of aeolian sands. The Chengchuan Formation and theMalan loess are heteropic deposits (sandy and loessic facies) formed contempora-neously under the wind action. The Chengchuan Formation is quite different fromits underlying Salawusu Formation whether in geochronology, lithology and sedi-meatary facies or in palaeontology. The Chengchuan Formation was deposited inthe Wurm ice age (at about 70 000--10 000 a. B. P.), mainly in an arid, cold,windy and sandy desert and desert-steppe environment;while the Salawusu Forma-tion was formed in the Riss and Wurm inter-ice age, prior to 70 000 a B. P.,mainly in a warm and humid forest and forest steppe environment.
出处
《地质论评》
CAS
CSCD
北大核心
1993年第2期91-100,共10页
Geological Review
关键词
上更新世
城川组
地层
河流
沉积
Upper Pleistocene
Chengchuan Formation
Salawusu River Reaches in Inner Monglia