准格尔煤田哈尔乌素矿区6号煤层夹矸中勃姆石的分布及成因  

Distribution and Formation Mechanism for Boehmite of No.6 Coal Partings at Haerwusu Mining Area, Junger Coalfield

作　　者：张帅[1] 刘钦甫[1] 石松林[1] 孙波[1] 孙俊民 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]国家能源高铝煤炭开发利用重点实验室,内蒙古呼和浩特010050

出　　处：《矿物学报》2014年第1期92-96,共5页Acta Mineralogica Sinica

基　　金：国家自然科学基金资助项目(批准号:41072119)

摘　　要：运用X射线衍射、傅里叶红外光谱以及偏光显微镜等手段对内蒙古准格尔煤田哈尔乌素矿区主采6号煤层夹矸的矿物成分进行了分析,结果表明:勃姆石在6号煤夹矸中分布广泛,尤其是在煤层中部层位局部含量高达87%,底部层位勃姆石含量逐渐减少,而在煤层的上部层位则基本不含勃姆石。结合偏光显微镜分析推断其形成方式主要为2种,其一是高岭石脱硅蚀变形成;其二是泥炭聚集时期,由来源于盆地边缘隆起的古风化壳的Al(OH)3胶体在成岩作用过程中经压实脱水形成。Mineral composition of partings of No.6 coal seam at Haerwusu mining erea, Junger Coalfield was analyzed with X-ray diffraction, Fourier infrared spectrum and Microplariscope. Results indicate that the boehmite is enriched in the partings located in the central position of No.6 coal seam, and its content in some parts is over 87%. The boehmite tapers off toward the lower position and almost disappears in the upper position. Two kinds of formation mechanism of boehmite are concluded by using the microplariscope. One is that it develops from the alteration of kaolinite with desilicication, and another way involves transformation from gibbsite colloid came from the paleocrust of weathering located at the uplifted basin margin and suffered the compaction and dehydration during the diagenesis.

关 键 词：准格尔煤田 煤层夹矸 勃姆石 分布 成因 

分 类 号：P571[天文地球—矿物学] P579[天文地球—地质学]