The Oldest Eolian Deposit of Cenozoic in Lanzhou Area

详细信息   

• 责任者：Zhang Yuebao (Key Laboratory of West China’s Environmental System ; Ministry of Education ; Lanzhou University ; Lanzhou 730000 ; China) ; Sun Donghuai
• 刊名：Acta Geologica Sinica
• 出版年：2012
• 卷期：86(3)
• 关键词：风成沉积作用 ; eolian sedimentation ; 甘肃 ; Gansu Province
• 页码：p.503-513
• 图表：7 illus., 2 tables, 57 refs.
• 分类号：0803
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

摘要

 
    

The study of eolian deposition in Western Loess Plateau is one of important problems in resent paleoclimatic studies, but the age of the Cenozoic eolian deposition is still in dispute. This study was carried out the rock magnetism, grain size, composition analysis and electron microscope analysis of Fenghuangshan section which is 916 m thick, north of Lanzhou area. The results showed that most of the clay is non-horizontal bedding. The distribution curves, probability cumulative curves and composition characteristics of grain-size, susceptibility, elemental content, morphology of quartz grains of them are similar to those of typical loess, paleosol and red clay samples. So they are eolian deposit, which is the oldest eolian deposit of Cenozoic found in Lanzhou area presently.