关键词: 第四纪粗砂砾层, 昆仑山隆起, 新疆叶城地区

Abstract: A series of Quaternary sands and gravels are well distributed on the northern foot of West Kunlun Mountains in Yecheng area oi' Xinjiang.Based upou their appearance and composition of landforms,these deposits in different ages occur in zonation.The Xiyu Conglomerate (Q₁) of early pleistocene,conformably contacted with the red sandstone and siltstone of pliocene at the front of the mountains,is drawn and intensively deformed with the upheaval of the Kunlun Mountains.Wusu Group (Q₂),a group of grayish sand-gravels unconformably covered on the pliocene and lower pleistocene strata,extended toward the front of the mountains to form the high pluvial platfrom.The lower pluvial platforms are constructed of upper pleistocene strata which spread outside the high pluvial platforms and in the valleys outside the mountains.They have been weathered to form thesurface of conglomerate-Gobi.In addition,aeolian sandy loess spread fromthe periphery of Taglamagan Desert to the high mountains below the elevation of 4,200m asl.