内蒙古萨拉乌苏河流域第四系更新统上部萨拉乌苏阶基本特征剖析  

An analysis of the basic characteristics of the Upper Pleistocene Salawusuan Stage in the Salawusu River Valley,Inner Mongolia

作　　者：闵隆瑞[1] 朱关祥[2] 关友义[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国地质科学院,北京100037

出　　处：《中国地质》2009年第6期1208-1217,共10页Geology in China

基　　金：全国地层委员会"中国主要断代地层建阶研究"项目(200113900076)资助

摘　　要：本文概述了对内蒙古萨拉乌苏河流域酒房台剖面更新统上部年代地层-萨拉乌苏阶初步研究的成果。萨拉乌苏阶底部为黄棕色砂层,底界年龄暂定为150ka,顶界年龄约10ka,萨拉乌苏阶上部与下部界线年龄约75ka。萨拉乌苏阶下部以湖沼相沉积为主,夹风、河流堆积物;上部以风成砂为主,夹湖沼相沉积物。150ka以来该区经受3次水体扩张3次风砂侵入。阶内代表性的古脊椎动物化石,下部是鄂尔多斯人(即河套人)、王氏水牛、诺氏象、河套大角鹿、哈克图转角羊等;上部是披毛犀和野驴等。古气候特征是150～75ka期间,以温湿为主,但中间曾夹有多次气候波动。75～60ka时期气候转为干冷、多风,60～20ka间气候明显暖湿。20～10ka气候又转温。This paper gives a summarized description of the preliminary research results of Salawusuan Stage, an Upper Pleistocene chronostratigraphic unit along the Jiufangtai section of the Salawusu River Valley in Inner Mongolia. The bottom of Salawusuan stage is yellowish brown sand layer. The age of the bottom boundary of the Salawusuan Stage is tentatively identified as 150 ka B.P., and that of the top boundary is around 10 ka B.P.. The boundary age between the upper part and the lower part of the Salawusuan Stage is about 75 ka B.P.. The lower part of the Salawusuan Stage consists of limnetic sediments interbedded with fluvio-aeolian accumulation, and the upper part is composed of aeolian sands supplemented by limnetic sediments. This region has experienced 3 times of water body expansion and 3 times of blown sand invasion since 150 ka B.P.. The representative fossils of ancient vertebrate are Ordos Homo sapiens, Bubohus wansjocki, Palaeoloxodon naumanni, Megaloceros ordosianus, Spirocems kiakhtensis, etc. in the lower part of the Salawusuan Stage, and Coelodonta antiquitatis, Equus hemionus, etc. in the upper part. The paleoclimate in this region was mainly warm and wet during 150-75 ka B.P. ,but was repeatedly interrupted by dry and cool climate intervals. During 75-60 ka B.P., the climate became arid, cold and windy. It was warm and wet during 60-20 ka B.P.. During 20-10 ka B.P., however, the temperature somewhat got lower again.

关 键 词：萨拉乌苏河流域 萨拉乌苏阶 更新统上部 

分 类 号：P534.63[天文地球—第四纪地质学]