华北中部太原组火山事件层与煤岩层对比——火山事件层的沉积学研究与展布规律(Ⅰ)

Volcanic Event Strata and Correlation of Coals and Rocks of Taiyuan Formation in Central North China ——Sedimentary Study of Volcanic Event Strata and Their Distribution(I)

研究了华北中部太原组含煤地层中火山事件层的岩石学识别标志和分布规律．研究结果表明：含煤地层中广泛发育火山事件层．火山事件层的岩石类型以玻屑（沉）凝灰岩、玻屑晶屑（沉）凝灰岩和凝灰质中细粒砂岩为主．火山事件沉积的成因类型以空降－水携复合型和空降型为主．研究区由西向东，火山事件层的赋存层位有上迁的趋势；从东、西两个方向向峰峰地区均远离火山源．西部区和东部区分别对应一个火山源，东部区火山源位于河北康堡、围场一带，西部区火山源位于内蒙古达尔罕明安旗一带．

Much attention is paid to petrologic recognition marks and distribution regulation of volcanic event strata in coal bearing sequences of Taiyuan formation in the middle of North China. The results are as follows: Volcanic event strata develop extensively in the coal bearing sequences. Their lithologic types are dominated by vitric tuff, vitric crystal tuff and medium fine tuffy sandstone, and their genetic types mainly belong to complicated type of the airborne water carried and the airborne type. The positions where the volcanic event strata occur show a tendency of going upward from west to east in the studying area, while Fengfeng site, whether eastern or western, is far away from the volcanic sources. Both the west part and the east part correspond to one volcanic source respectively, with the former locating in Daerhanmingda of Inner Mongolia, while the latter in Kangbao Weichang zone of Hebei.