滇东老厂煤田晚二叠世聚煤环境剖析与成煤模式  

Discussion on Late Permian coal-accumulating environment and its coal-forming pattern in Laochang coalfield,eastern Yunnan Province,China

作　　者：郑玉清 王建琼[2] 

机构地区：[1]云南省煤田地质局,云南昆明650034 [2]云南省地质矿产勘查开发局第一地质大队,云南曲靖655001

出　　处：《煤田地质与勘探》2003年第5期13-16,共4页Coal Geology & Exploration

摘　　要：通过对滇东老厂煤田形成的地质背景和晚二叠世含煤地层沉积特征的综合分析 ,剖析了典型的潮坪聚煤环境和三角洲聚煤环境及其成煤作用。该区晚二叠世的海陆过渡环境演化顺序为 :局限碳酸盐台地—泻湖潮坪—浅水三角洲聚煤环境 ,其中从龙潭中期末至长兴期各种聚煤条件配合最有利于聚煤。所以 ,后期的潮坪和浅水三角洲是该区最重要的聚煤环境。据此 。The authors comprehensively analyzed the geological background and the epositional characteristics of the Late Permian coal bearing strata in Laochang coalfield,eastern Yunnan.The typical coal accumulating environment and coal forming effects with the tidal flats and the deltas are discussed in details.Accordingly,it was recognized that sequence of the environmental evolves of the Late Permian strata in this area is :the confining carbonate platform—the lagoons and the tidal flats—the shallow water deltas of sea.The coordination of various conditions was most suitable to coal accumulating from the Middle Longtan stage to the Chanxing stage of the Late Permian.As a result,these tidal flats and these shallow water deltas of the Late Later stage Permian are the most important coal accumulating environments in this area.They formed numerous more stable and thicker coal seams.Based on this,The coal accumulating environment evolves and coal forming pattern of the coal accumulating stage of the Late Permian in this area was established primarily.

关 键 词：聚煤环境 成煤模式 晚二叠世 滇东老厂煤田 

分 类 号：P618.110.2[天文地球—矿床学]