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大同煤田白洞矿区5号煤层煤相特征
引用本文:刘东娜,周安朝,马美玲. 大同煤田白洞矿区5号煤层煤相特征[J]. 中国煤炭地质, 2011, 0(5): 1-4,52
作者姓名:刘东娜  周安朝  马美玲
作者单位:太原理工大学,山西太原030024
摘    要:采用光学显微镜、X射线荧光光谱(XFS)和电感耦合等离子体质谱(ICP-MS)等方法测定了大同煤田塔山井田太原组5号煤的宏观煤岩类型、显微煤岩类型和地球化学参数,探讨了煤的煤岩学、煤地球化学及煤相特征,系统地分析了煤层的原始成煤泥炭沼泽环境及演化规律。研究结果表明,5号煤层有4种煤相类型,即湖沼相、泥炭沼泽相、潮湿森林沼泽相和较干燥森林沼泽相,相应表现为湖泊、障壁岛后潟湖、上三角洲平原和洪泛盆地含煤沉积体系特征。煤层自下而上存在5次比较明显的沉积旋回韵律,与之相随的水介质环境也发生了相应的海陆、咸水、淡水交替变化,从而形成了一套以陆相为主、海陆交互的成煤泥炭沼泽环境,沉积环境逐渐从海相、海陆过渡相向陆相演化。

关 键 词:5号煤层  白洞矿区  煤相特征  煤岩学  煤地球化学

Coal Facies Characteristics of No.5 Coal Seam in Baidong Mine Area,Datong Coalfield
Liu Dongna,Zhou Anchao and Ma Meiling. Coal Facies Characteristics of No.5 Coal Seam in Baidong Mine Area,Datong Coalfield[J]. Coal Geology of China, 2011, 0(5): 1-4,52
Authors:Liu Dongna  Zhou Anchao  Ma Meiling
Affiliation:(Taiyuan University of Technology,Taiyuan,Shanxi 030024)
Abstract:Methods of optical microscope,X-ray fluorescence spectrometry(XFS) and inductively coupled plasma mass spectrometry(ICP-MS) have been used to determine macrolithotype and microlithotype of coal,geochemical parameters of the No.5 coal seam in the Taiyuan Formation,Tashan minefield,Datong coalfield;coal petrology,geochemical and coal facies characteristics discussed;and coal seam primary coal-forming peat bog environment and evolutionary pattern systematically analyzed as well.The results have demonstrated that: No.5 coal seam has four facies types,namely limnetic facies,peat bog facies,humid and rather dry forest-swamp facies,correspondingly shown as lacus,back-barrier lagoon,upper delta plain and flood basin coal-bearing systems characteristics.From bottom to top,coal seams show 5 distinct sedimentary cyclic rhythms,correspondingly environment aqueous media vary from oceanic-continental,brine-fresh water alternatively.Accordingly,a set of mainly terrestrial and transitional marine to limnic facies coal-forming peat bog environment formed,and gradually evolved from marine,marine-limnic to terrestrial facies.
Keywords:No.5 coal seam  Baidong mine area  coal facies characteristics  coal petrology  coal geochemistry
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