罗布泊全新世沉积特征及其环境意义  

GRAIN SIZE DISTRIBUTION CHARACTERISTICS AND CHANGES OF LOP-NUR LAKE SEDIMENTS DURING THE PAST 10000 YEARS

作　　者：朱青[1] 王富葆[1,2] 曹琼英[1] 夏训诚[3] 李升峰[1] 马春梅[1] 

机构地区：[1]南京大学地理与海洋科学学院,江苏南京210093 [2]中国科学院地球环境研究所,陕西西安710054 [3]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011

出　　处：《地层学杂志》2009年第3期283-290,共8页Journal of Stratigraphy

基　　金：国家自然科学基金(No.40701190);教育部博士点新教师基金(No.20070284067);中国科学院地球环境研究所开放测试基金

摘　　要：罗布泊西湖属开阔湖盆,上世纪30年代其面积达1900km2,但湖心剖面粒度分析的结果表明,其粒度组成与一般开阔湖盆有着显著的不同:沉积物常具黄色与灰色互层结构,层理清晰,黄色层的粒度组成中常含较多粗颗粒砂,灰与黄色层的混合样是以粉砂黏土为主,同时含有一定量的中、细砂,甚至粗砂。根据与风成砂和尘暴沉积的粒度组成对比,可知这种沉积特征与现代尘暴沉积有很大的相似性,因而表明风尘是罗布泊沉积的重要物源,并可据此来恢复10000a以来本区尘暴作用的强弱变化。The Lake Xihu of Lop-Nur was an open lake basin with an area of 1 900km^2 until the 1930s. A grain size analysis of the lake Xihu sediment shows： Lop-Nur is different from other ordinary open lake basins in sediment grain size distribution. Most of the deposits consist of regularly interbeded yellow and gray layers. The yellow layers have a higher content of coarse sands. Mixed samples of gray and yellow layers mainly consist of silts and clay, with some medium to coarse sands. The sands are interpreted as dust storm deposits; the grain size distributuin of the aeolian sands is much similar to that of dust storm deposits, eolian deposits are one of the most important sediment sources for Lop-Nur. Based on these da- ta, a 10 000-year dust-storm history in the Lop-Nur area can be reconstructed.

关 键 词：湖泊沉积 粒度分析 风成沉积 第四系 罗布泊 新疆 

分 类 号：P534.63[天文地球—第四纪地质学]