四川龙门山中段上三叠统须家河组特征  

The Upper Triassic Xujiahe Formation in the Longmen Mountain area, Sichuan

作　　者：苟宗海[1] 

机构地区：[1]成都理工学院,四川成都610059

出　　处：《沉积与特提斯地质》2001年第1期93-101,共9页Sedimentary Geology and Tethyan Geology

摘　　要：上三叠统须家河组广泛分布于四川汶川县、都江堰市、崇州市、大邑县等毗邻地区。呈NE向展布 ,出露面积大于 150km2 ,厚度大于 2 851m。笔者在进行 1:5万“三江幅”和“万家坪幅”区域地质调查时 ,于该区测制了须家河组剖面。本文对这一地区的须家河组进行了一、二、三段的划分 ,并对岩石特征、地层对比、底顶界线、生物地层和年代地层进行概略讨论 ;须家河组的沉积环境可划分为三角洲相和河流相。The N S elongated Upper Triassic Xujiahe Formation strata cover an area of 150 km 2 and a thickness of more than 2851 m in the Dayi Chongzhou Dujiangyan Wenchuan zone, Sichuan. After the surveying of the 1∶50000 Sanjiang Sheet and Wanjiaping Sheet from 1997 to 1999, the author subdivided the Formation into three members, with particular emphasis on lithology, stratigraphic boundary and correlation, biostratigraphy and chronostratigraphy. Two types of sedimentary environmerts are also discriminated:delta facies and fluvial facies.

关 键 词：须家河组 岩石特征 地层对比 沉积环境 上三叠统 三角洲相 河流相 

分 类 号：P534.51[天文地球—古生物学与地层学]