湖北省晚二叠世龙潭组沉积期岩相古地理格局与成煤环境  

Lithofacies Paleogeography and Coal-Forming Environment of Longtan Group of Late Permian in Hubei Province

作　　者：张汉金 徐立中 颜代蓉 余正清 李超 梅萍芳 

机构地区：[1]湖北省地质调查院,武汉430034

出　　处：《地质科技情报》2012年第4期50-54,共5页Geological Science and Technology Information

基　　金：中国地质调查局煤炭资源潜力评价项目(1212010881621)

摘　　要：晚二叠世龙潭组沉积期是湖北省境内一次重要的成煤时期,由于煤层的不稳定性,其煤层层数、厚度、煤质等存在明显差异。通过岩性、煤层及古生物研究对比,查明龙潭组由下向上共出现5个煤层,煤层的形成与沉积特征明显受岩相古地理条件所制约。在龙潭组沉积期,湖北省境内总体为"两陆夹一盆"的基本格局,形成潮坪-泻湖-障壁岛沉积体系,该沉积体系是华南海北部沉积区的一个组成部分,由秦淮古陆、海湾泻湖及江南古陆组成,沉积区主要为泻湖相和潮坪相单元,其中沼泽亚相为煤层的最佳沉积环境。Longtan Group of Permian is most important coal-forming phase. The unstable coal form, the quantity, the thickness and quality in this group have obvious difference. By comparing lithology, coal form and lithofacies, Longtan Group exist five coalbeds controlled by lithofacies paleogeography. There were two lands and one basin in Hubei Province. Depositional model of lithofacies geographical evoluted form tidal flat to lagoon and barrier island. This deposition system is one of part in the north of South China Sea, its sediment composing of tidal flat and lagoon. Marsh subfacies are best sedimentary environment for coal forming.

关 键 词：成煤规律 岩相古地理 龙潭组沉积期 晚二叠世 湖北省 

分 类 号：P618.11[天文地球—矿床学]