湖北恩施州马鞍煤系沉积环境及聚煤规律

Maan Coal Measures Sedimentary Environment and Coal Accumulation Pattern in Enshi Autonomous Prefecture,Hubei

根据地质调查资料与以往研究成果,从岩性特征、沉积构造、古生物特征、岩相古地理及沉积环境的演化等方面,对湖北省西部马鞍煤系进行分析,结果表明:马鞍煤系总体上由海进沉积序列组成,沉积环境主要有障壁岛-瀉湖、滩-潮坪、潮坪和广阔海坪等类型,由此形成区域内的一、二、三、四煤。受古构造、古地形、古地理的影响,富煤带总体呈北西向展布,主要集中于建始东部至巴东中部条带。

Based on geological investigation and previous studied results,carried out analysis on the Maan coal measures in western Hubei Province from aspects including lithological features,sedimentary structure,paleontological features,lithofacies and paleogeography,as well as sedimentary environment.The result has shown that as a whole,the coal measures is composed of transgressive sedimentary sequences;sedimentary environments have barrier island-lagoon,beach-tidal flat,tidal flat and spacious sea flat etc.thus formed coal Nos.1,2,3 and 4 in the area.Impacting from paleostructure,paleotopography and paleogeography,the coal rich zone is presented NW spreading in the mass,and centralized in the belt from eastern Jianshi to central Badong.