Characteristics and Evolution of Sedimentary Facies in Upper-Triassic Zhongwo Formation Ore-Bearing Rock Series from Heqing-Songgui Area

Key words: 
• sedimentary facies /
• Zhongwo Formation /
• ore-bearing rock series /
• Heqing-Songgui area /

Abstract: Heqing-Songgui area is located in Heqing County of Dali prefecture in YunNan province, it is situated in southeast of Tibetan Plateau and the middle of Hengduan mountains, between Maan mountain and Jinsha river, it belongs to Heqing-Songgui basin where the west bank of Jinsha river. This paper is as ore-bearing rock series on Zhongwo Formation of upper triassic in Heqing-Songgui area, and for the characteristics and classification of sedimentary facies and evolution has carried on the systematic research. According to the detailed observation of the rock types' characteristics, restricted gulf facies-lagoon facies have been developed in the study area. Top of subtidal zone, intertidal zone, supralittoral zone, upralittoral-swamp are developed. Based on depth analysis about profile structure and rock geochemistry, by NW-SE/SSW-NNE/EW three sedimentary facies profiles comparative studying, restored facies and palaeogeography their appearance and evolution. Al-bearing rock series which in the bottom of Zhongwo Formation is strictly controlled by unconformity surface topography and karst landform which is on the upper top of Beiya Formation limestone, it can provide theoretical basis for Bauxite exploration.