四川名山建山大邑砾岩沉积特征及地层时代  

Sedimentary characteristics and stratigraphic ages of the Dayi conglomerates in Mingshan,Sichuan

作　　者：莫雄[1] 赵兵[1] 

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059

出　　处：《沉积与特提斯地质》2010年第4期72-78,共7页Sedimentary Geology and Tethyan Geology

基　　金：四川名山等四幅1:5万区域地质调查项目(项目编号:1212010610212)

摘　　要：详细描述了四川名山建山大邑砾岩实测剖面,讨论了大邑砾岩的岩性组合特征及沉积环境。认为大邑砾岩主要为一套位于风化壳之上的河流-冲积扇沉积,自下而上由细变粗,属于物源区总体不断上升过程中的近源沉积。通过大邑砾岩中的孢粉组合,讨论了其地质时代。该剖面孢粉组合以水龙骨科孢子为主,年代地层归属于新近系上新统。The present paper deals,in detail,with the measured section,lithologic associations and sedimentary environments of the Dayi conglomerates in Mingshan,Sichuan.The Dayi conglomerates are interpreted as a succession of proximal fluvial-alluvial deposits above the weathering crust,and display a coarsening-upward sequence.The predominant sporopollen associations Polypodiaceae in the stratigraphic section indicates that chronostratigraphically,the Dayi conglomerates should belong to the Pliocene.

关 键 词：名山 大邑砾岩 沉积相 孢粉组合 上新统 

分 类 号：P588.215[天文地球—岩石学]