LOESS IN THE LONGXI BASIN OF GANSU PROVINCE  

作　　者：文启忠 郑洪汉 韩家懋 王俊达 林绍孟 乔玉楼 魏兰英 刁桂仪 

机构地区：[1]Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PRC

出　　处：《Chinese Geographical Science》1991年第4期80-90,共11页中国地理科学（英文版）

摘　　要：The Nuanquangou loess section in the Longxi Basin has been examined in terms of stratigraphic investigation,. including 14C dating, paleomagnetic polarity, spore-pollen diagram, and mineral and chemical analyses. The results indicate that the section is one of the ancient loess sections with a continuous sedimentation and composed of homogeneous materials with abundant carbonate. The Brunhes / Matuyama boundary and the Jaramillo event were recorded in the section. Stratigraphically,this section can be divided into the Holocene and the Pleistocene loess. The latter includes Malan, Lishi and Wucheng loess in descending order. They were developed at about 1.2 Ma ago, whereas the Nuanquangou loess section possesses some local characteristics different from those observed in other areas.The Nuanquangou loess section in the Longxi Basin has been examined in terms of stratigraphic investigation,. including 14C dating, paleomagnetic polarity, spore-pollen diagram, and mineral and chemical analyses. The results indicate that the section is one of the ancient loess sections with a continuous sedimentation and composed of homogeneous materials with abundant carbonate. The Brunhes / Matuyama boundary and the Jaramillo event were recorded in the section. Stratigraphically,this section can be divided into the Holocene and the Pleistocene loess. The latter includes Malan, Lishi and Wucheng loess in descending order. They were developed at about 1.2 Ma ago, whereas the Nuanquangou loess section possesses some local characteristics different from those observed in other areas.

关 键 词：LOESS QUATERNARY SEDIMENTS Longxi BASIN 

分 类 号：P[天文地球]