顶峰山矿区39号煤层的煤岩学与煤相特征

利用煤岩学和沉积地球化学相结合的方法,从煤岩学、沉积学、古植物和沼泽水介质动力条件等方面对福建龙永煤田顶峰山矿区二叠系童子岩组主采39号煤层进行了研究,结果表明：39号煤层的煤相包括4种类型，即闭流沼泽相、障壁岛－泻湖沼泽相、强覆水森林沼泽相和浅覆水森林沼泽相，其中强覆水森林沼泽相是该煤层煤相类型的主体，在沼泽演化过程中占有主导地位；沼泽覆水深度的变化会引起煤相组合和旋回结构的相应变化。煤层从下而上由浅覆水森林沼泽相、强覆水森林沼泽相和弱覆水森林沼泽相等组合而成，韵律明显。沼泽水动力条件同样经历了由弱-强-弱的演化过程，沼泽水流具有由滞流-活动-滞流的周期性变化特点，泥炭沼泽水介质总体上处于弱-强还原环境；该煤层在其形成过程中不断受到海陆两方面的影响，泥炭沼泽发育过程呈现出波动式变化,导致泥炭沼泽类型呈跳跃式演化，从而形成了一套海陆交互相的成煤沼泽环境，表现为障壁岛－泻湖沉积体系的沉积特征。

Coal petrology and facies of coal seam No.39 from Dingfengshan mining district,Longyong coalfield,Fujian Province,China

The main-exploited No.39 coal seam in Tongziyan Formation Permian in Dingfengshan mining area of Longyong Coalfield was studied in the aspects of coal petrology,sedimentology,fossil plants and dynamic condition of aqueous medium in swamps,etc.,used the combined methods of coal petrology and sedimentary geochemistry.The result shows that the coal facies in No.39 coal seam have four types,namely,the noncontributing swamp facies,barrier island-lagoon marsh facies,strongly and weakly overlying-water forest swam...