郴州地区煤田地质特征及找煤远景区

本区地槽型煤田,主要是下寒武统牛蹄塘组,由一套浅海相碳质板岩为主组成的含钒石煤岩系,与下伏地层呈整合关系。地台型煤田有下石炭统测水煤系和上二叠统斗岭煤系,它们是以一套海陆交互相的细碎屑岩为主,夹菱铁矿或黄铁矿结核及煤组成,与下伏地层呈整合关系。其中斗岭煤系的煤层分布广,煤层及煤质较好,是本区找煤的对象。地洼型煤田,为上三叠—下侏罗统煤系,呈零星小块分布,是一套以陆相,杂色粗碎屑岩为主,夹泥岩及煤组成,与下伏地层呈不整合关系。主要发育在资兴市和宜章县一带,找煤条件次于斗岭煤系。

GEOLOGIC FEATURE OF THE COAL FIELDS IN CHENZHOU PREFECTURE AND PROSPECTS FOR COAL

The geosynclinal type coal fields in this region are mainly those occurring in Niutitang Formation of Lower Cambrian Series, which is a Vanadium-bearing stone coal rock sequence dominated by a set of shallow marine facies carbonaceous slate, contacted with the underlying strata conformably. The platform type coal fields include those of Ceshui coal measure of Lower Carboniferous Series and Douling coal measure of Upper Permian Series, which are dominated by a set of marine-continental alternating facies fine clastic rocks, intercalated with siderite or pyrite nodules, contacted with the underlying strata conformably. The Douling coal measure distributed most extensively, and the quality of its coal seam is the best, which is the target to be looked for in this region. The diwa type coal fields are refered to those of Upper Triassic-Lower Jurassic coal measures, distributed in small pieces and scattered, dominated by a set of continental facies variegated coarse-grained clastic rocks, intercalated with mudstone and coal, unconformably contacted with the underlying strata, occurred mainly along a zone from Zixin city to Yizhang county, which is considered to be a promising coal measure next to Douling coal measure.