乌兰布和沙漠的形成与环境变化  

Formation of Ulan Buh Desert and Its Environmental Evolution

作　　者：春喜[1] 陈发虎[2] 范育新[2] 夏敦胜[3] 赵辉[3] 

机构地区：[1]内蒙古师范大学地理科学学院,内蒙古呼和浩特010022 [2]兰州大学西部环境教育部重点实验室,甘肃兰州73000 [3]中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室,甘肃兰州730000

出　　处：《中国沙漠》2007年第6期927-931,共5页Journal of Desert Research

基　　金：中国科学技术部国际合作项目(2002CB714001);国家自然科学基金项目(40761028)资助

摘　　要：在对乌兰布和沙漠进行野外考察的基础上,通过地貌学、沉积学和年代学的研究,为恢复该地区全新世以来沙漠的形成与演化找到了新的证据。乌兰布和沙漠西南部的吉兰泰盐湖周围及沙漠南部丘间低地湖相地层下部风成砂的系统OSL测年结果表明,乌兰布和沙漠的形成年代约在7ka BP前后。此外,该沙漠腹地众多的干盐湖,大量含有蓝蚬的湖岸堤,以及丘间低地中的湖相地层和植物根系等的存在,证明了沙漠腹地大古湖的存在。乌兰布和沙漠的形成,可以归因于吉兰泰古湖面积的不断缩小和干涸,湖泊周围松散沉积物的风蚀、搬运及选择性堆积过程。　Extensive investigation and studies on topography,sedimentary and chronology show new evidences for formation and evolution of Ulan Buh desert during early Holocene.Proved by evidences on clay-sand strata and plant roots under inter-dune lowlands,lake shorelines covered by plenty of Corbicula largillierti,and large amounts of dry salt lakes in the central region of Ulan Buh desert,many megalakes ever existed in the hinterland of Ulan Buh desert.Several OSL samples collected from aeolian sands overlying lacustrine sediments in profiles around Jrentai salt lake and inter-dune lowlands in the southern Ulan Buh desert suggest that the desert began around 7 ka BP.The formation of Ulan Buh desert may be resulted from the shrinking of Jrentai megalake and sands blew from exposed loose sediments.

关 键 词：乌兰布和沙漠 古湖演化 环境变迁 风成沉积 

分 类 号：P532[天文地球—古生物学与地层学]