瑞丽中下三叠统地层时代厘订及沉积环境分析

THE REVISION OF MIDDLE-LOWER TRIASSIC STRATIGRAPHIC SEQUENCE AND THE ANALYSIS OF SEDIMENTARY ENVIRONMENT IN RUILI

滇西瑞丽地区的中下三叠统可划分为三角洲(泻湖)、碳酸盐台地两种相区。三角洲(泻湖)相区下三叠统为扎多组(T1z^);中三叠统为伙马组(T2hm):碳酸盐台地相区中下三叠统河湾街组(T1-2h)。对扎多组、伙马组重新划分,进行沉积环境分析,确定扎多组、伙马组与河湾街组之间是相变关系,为研究古代三角洲与障壁海(泻湖)及局限台地的沉积环境、相变关系提供了良好实例。

The Middle - Lower Triassic in Ruili area of West Yunnan can be divided into 2 facies, ie delta （lagoon） and carbonate platform. The Lower Triassic in the delta （lagoon） facies area is Zaduo Formation （T1z） , the Middle Triassic is Huoma Formation （T2hm） . The Middle -Lower Triassic in carbonate platform facies area is Hewanjie Formation （T1 _2h） ~ According the re -division of Zaduo Formation and Huoma Formation and the anal- ysis of sedimentary environment, we determine the facies change of Zaduo Formation, Huoma Formation and He- wanjie Formation, which can provide a good example for the study of sedimentary environment and facies change of old delta, barrier lagoon and limited platform.