摘要
近年来,在前人工作基础上,通过野外调查,采集到一批^(14)C样品。据^(14)C年龄数据和孢粉、粘土矿物、粒度等分析资料确定,广汉粘土与成都粘土同属上更新统;广汉粘土形成于距今2.5万—5.0万年,属晚更新世中晚期河湖相沉积;成都粘土形成于距今1.0万—2.5万年,属晚更新世末期风成沉积。
Guanghan Clay and Chengdu Clay are widely distributed at the Chengdu Plain. They are the main strata in the upper part of the Chengdu Plain. Up to now, the dales have had a controversy.Based on the research of predecessors,a mass of 14C simples of Guanghan Clay and Chengdu Clay were collected though the geologic survey of Quaternary period in recent years.According to data of 14C dates and analysis of sporo-pallen.clay mineral and size,the conclusion are:1.Guanghan Clay and Chengdu Clay all belong to Epipieistoccee strata;2.Guanghan Clay was formed in 25,000-50,000 aB. P. and belong to fluviolacutrine deposits of meso- and late Epipleistocene;3.Chengdu Clay was formed in 10,000-25,000 aB. P. and belong to colian deposits of last Epipleistocene.
出处
《山地研究》
CSCD
1990年第3期167-173,T001,T002,共9页
