滇西花开左组岩石地层、生物地层特征及沉积环境分析  

Analysis of lithostratigraphic and biostratigraphic characteristics and sedimentary environment of Huakaizuo Formation in west Yunnan Province

作　　者：李超 王巍 任洪超 李江勇 LI Chao;WANG Wei;REN Hongchao;LI Jiangyong(Yunnan Exploration Institute of Geology and Mineral Resources,Kunming 650051,Yunnan,China)

机构地区：[1]云南省地质矿产勘查院,云南昆明650051

出　　处：《矿产勘查》2024年第S2期382-391,共10页Mineral Exploration

基　　金：中国地质调查局项目(121201010000150007-23;DD20160016-09)资助。

摘　　要：滇西花开左组是兰坪—思茅盆地的重要组成部分。对滇西大朝山东镇别落村和振太镇谢家田一带出露花开左组进行了实测剖面和系统采样工作。依据岩性组合的差异将花开左组划为两个非正式段。依据化石组合特征可划分出产海相双壳Camptonectes-Protocardia组合带、陆相双壳Pseudocardinia-Psilunio-Cuneopsis组合带、腹足类Amplovalvata-Viviparus组合带、腕足类Burmirhynchia-Holcothyris组合带,年代地层属中侏罗世西山窑阶—头屯河阶。沉积环境为河流相-陆缘近海湖泊相。Huakaizuo Formation in western Yunnan is an important part of Lanping-Simao Basin.The measured profile and systematic sampling work were carried out for the exposed Huakaizuo Formation in Bieluo Vil-lage,Dachaoshandong Town,and Xiejiatian Area,Zhentai Town,western Yunnan.According to the difference of lithologic combination,Huakaizuo Formation is divided into two informal-members.According to the characteristics of fossil assemblage,it can be divided into marine bivalve Camptonectes-Protocardia assemblage zone,continental bivalve pseudopodia-psilunio-cuneopsis assemblage zone,gastropod Amplovalvata-Viviparus assemblage zone and brachiopod Burmirhynchia-Holcothyris assemblage zone,and the chronostratigraphy belongs to the middle Jurassic Xishanyao Toutunhe Stage.The sedimentary environment is fluvial facies-marginal coastal lake facies.

关 键 词：岩石地层 生物地层 沉积环境 花开左组 滇西 

分 类 号：P52[天文地球—古生物学与地层学] P535[天文地球—地质学]