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.
Abstract:
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 cryst all oliths with homog enization temperature of 1 030℃,proving these quartzs are high temperature volcanic ones.The heavy minerals are mainly long-columnnar ziron,magnetite,barring erite and tourmaline with perfectcrystal form.
下载:
