宁夏呼鲁斯太矿区5^#煤层粘土岩夹矸的研究  

Study on gangue of tonstein within No.5 coal-bed in Hulstai coal district,Ningxia

作　　者：姚爱民[1] 

机构地区：[1]西安地质矿产研究所,陕西西安710054

出　　处：《西北地质》2003年第1期78-83,共6页Northwestern Geology

摘　　要：经大量的薄片鉴定和测试分析,揭示了宁夏呼鲁斯太矿区5#煤层第二分层夹矸为高岭岩矿层,厚0.1～0.7m,块状构造,具有典型的粒序层理。主要由球面棱角状、椭球状颗粒及隐晶高岭石基质组成,含量>90%,还含有少量β副象石英晶屑,石英中富含熔融和气态包体,均一化温度1030℃,为高温火山石英。重矿物为晶形完整的长柱状锆石、磁铁矿、磷灰石、电气石组合。稀土元素含量及配分模式示踪原岩具有酸性岩浆岩的特征。表明该层高岭岩的原始物质是酸性降落的火山碎屑物质,经蚀变转变而成。高岭岩铁、钛含量低,具有重要的开发利用价值,也是贺兰山北段煤田太原组顶部煤层的对比标志层。On the basis of great deal of thin section identification and testing analysis, it is revealed that the second layered gangue within No5 coalbed in Hulstai coal district is a layer of kaolinite deposit with 01~06 meters thickness,block structure and typical graded beddingThis layer of deposit is mainly made of spherical angular,ellipsoidal and aphanitic kaolinite, being over 95% kaoline content,besides,including a small quantity of β paramorphic quartz crystalloliths and heavy mineralsThere exist fusion and gaseous enclosure in the quartz crystalloliths with homogenization temperature of 1 030℃,proving these quartzs are high temperature volcanic onesThe heavy minerals are mainly longcolumnnar ziron,magnetite,barringerite and tourmaline with perfect crystal formREE content and partitioning model indicate that the pyroclasts of acid depression are transformed into kaolinite by alterationThis layer of kaolinite is characterized by low Fe2O3 and TiO2 content, having an important development and useful value In the sametime,it is also a layer of key bed in the contrast study of top coalbeds of Taiyuan Formation in the Northern coalfield of Helan mountain

关 键 词：煤层夹矸 粒序层理 矿物组成 地球化学 成因 

分 类 号：P618.11[天文地球—矿床学]