兰州—民和盆地第四纪地层学研究

Quaternary stratigraphy and paleoenvironmentof the Lanzhou-Minhe basin

在野外调查和室内分析的基础上,对兰州—民和盆地的晚新生代地层和环境进行了较系统的研究,对第四纪地层进行了地貌学、岩石学、年代学、土壤地层学和古气候学研究,查明了研究区各地貌单元形成时代与物质组成特点、侵蚀期与堆积期的旋回过程及黄土中1.9MaB.P.以来磁化率与古气候、古土壤事件(S26—S0)、古气候演化的周期(45ka、100ka)、特点和黄土中15万年以来短尺度气候事件(H1-9及DO1-10)。

On the basis of field surveys and indoor analyses,a systematic study has been carried out on the late Cenozoic stratigraphy of the Lanzhou Minhe basin.This paper describes in detail the Quaternary stratigraphy and change of the environment.Through geomorphologic,petrologic,chronological,soil stratigraphic and paleoclimatologic studies of Quaternary strata,the authors have ascertained the ages and material compositions of various geomorphologic units in the area and cycling process of the erosion stage and accumulation stage, as well as the susceptibility of loess and paleosol events(S26-S0)and paleoclimatic evolutionary periods (45ka,100ka) during the past 1.900 million years and short scale (H1-9,DO1-10) during the past 150000 years.