摘要
在岩石地层划分的基础上,讨论了西昌盆地三叠系沉积相类型及特征。研究区南部及北部缺失T1-2及T3下部地层,仅中部发育较完整的三叠系。南部白果湾组主要发育沼泽、沼泽化湖泊及湖泊相。北部白果湾组包括沼泽相、沼泽化湖相及湖泊相。中部白果湾组沉积相为沼泽、沼泽化湖泊、河流、河湖三角洲及湖泊相,雷口坡组沉积相包含潮坪、湖、生物滩(丘)、广海陆棚相;嘉陵江组及飞仙关组分别以河口和河流相为主。
This paper deals with types and distribution of Triassic sedimentary facies in the Xichang basin on the basis of rock - stratigraphic division. T1 - 2 and lower part of T3 were lost record in the south and north of the studied region. The whole Triassic formation was developed only in the middle section of the studied region. The Baiguowan Formation in south and north is characterized by swarmp deposit, swamping lake deposit and lacustrine deposit. The Baiguowan Formation in the middle section is characterized by swamp deposit, swamping lake deposit, fluvial, delta and lacustrine deposits. The Leikoupo Formation is characterized by tidal flat, lagoonal, organic reef and open- sea shelf deposits. The Jialingjiang Formation and Feixianguan Formation are characterized by estuarine deposit and fluvial deposit, respectively.
出处
《四川地质学报》
2007年第2期92-95,共4页
Acta Geologica Sichuan
关键词
三叠系
沉积环境
西昌盆地
Triassic System
sedimentary environment
Xichang basin
