内蒙古中部中更新统离石黄土特征及第四纪气候变化  

Characteristics of Middle Pleistocene Lishi loess and Quaternary climatic changes in Central Inner Mongolia

作　　者：李满环 那丹妮[1] 徐承泽[2] 

机构地区：[1]吉林省地矿信息中心,吉林长春130061 [2]吉林省区域地质矿产调查所,吉林长春130022

出　　处：《吉林地质》2012年第4期23-27,共5页Jilin Geology

摘　　要：内蒙古中部包头市—呼和浩特市一带由两种不同地貌单位组成,北部大青山山脉、南部为河套平原。区内第四系发育齐全,沉积厚度巨大。离石黄土的岩性主要为一套黄褐色、深黄褐色和棕褐色的粘黄土为主,夹有砂黄土、钙结黄土、钙质结核黄土层和古土壤层。热释光年龄在(37.19±2.83)×104aB.P.～(15.72±1.21)×104aB.P.。第四纪沉积物特征反应了环境和气候变化特征,在中更新统主要以干冷气候为主,期间出现了3个潮时。晚更新世早期为末次间冰期(12.8～7.00万年)气候,气候温暖湿润。本测区自6.8万年至0.95万年为湖相和风沙堆积,表明气候进入干冷气候期,为末次冰期(7.4～1万年)气候。Baotou-Hohhot area in central Inner Mongolia can be composed of two different geomorphic units,northern Daqingshan Mountain and southern Hetao Plain.Quaternary developed completedly in work aera,which has a great thickness of sediments.The Lithology combination of Lishi loess is mainly a set of tawny,dark tawny and tan fine-grain loess,which interbedded with sandy loess,calcareous concretion loess,calcareous concretion loess layer and paleosol.The TL age is between（37.19±2.83）×104aB.P.-（15.72±1.21）×104aB.P.The feature of the Quaternary sediments reflect the environment and climate change,mainly dry and cold climate in middle Pleistocene,and occurred the three tide.In early late Pleistocence,the last interglacial stage（12.8～7.00Ma） came,which is warm and humid.The workplace is mainly lacustrine facies and sand wind sedimentation between 6.8Ma-0.95Ma,show that the climate turn into the dry and cold climate period,which is the last glacial stage（7.4～1Ma） climate.

关 键 词：第四纪 离石黄土 气候 内蒙古中部 

分 类 号：P642.121[天文地球—工程地质学]