峨眉地幔热柱活动与贵州西部二叠系煤的形成环境研究

A study between Emei mantle plume activity and environment forming coal of Permian in western Guizhou Province

晚二叠世乐平期,最为强烈、规模最大的一次峨眉地幔热柱强烈活动在贵州西部形成西北高、东南低的古地理格局。沉积相带由早二叠世的近东西向变为晚二叠世北东向排布。沉积相带由西向东,由陆相渐变为海陆交替相,最后变为海相环境。在贵州西北部的威宁一带形成陆相沉积环境。遵义至安顺一线以西的黔西和黔西南地区,属于海陆交替的陆地边缘相区,其主体为潮坪-泻湖环境,海陆交替相带之南东,属碳酸盐台地相区。贵州煤矿主要产于海陆交替相区。

Leping age in Late Permian epoch,appear at the most intensive and the largest scale of the Emei mantle plume activity in western Guizhou Province.Leading to a paleogeographic pattern of high at northwestern as well as low at southeastern in western Guizhou Province.Sedimentary facies belt become an arrangement from east-west direction of Early Permian epoch to northeast direction of Late Permian epoch.From west to east,Sedimentary facies belt change from continental facies to the transitional facies between marine facies and continental facies,last to marine facies.Weining area in northwestern Guizhou Province formed continental facies environment;western and southwestern of Guizhou in west from Zunyi to An＇shun belong to continental margin area of the transitional facies between marine facies and continental facies,its main bodies is tidy-lagoon facies environment,southeastern area of the transitional facies between marine facies and continental facies belong to carbonate rock platform facies.Coal deposits main exist in the transitional facies between marine facies and continental facies in Guizhou Province.