摘要
北京西山煤田逆冲推覆构造形成于燕山早期，由盆地边缘向盆地内部逆冲，构成对冲式组合。其中，九龙山逆冲推覆构造具有双冲构造的组合特点。燕山中、晚期，煤田内逆冲推覆构造进一步发展，并且被一些北北东向逆断层切割、破坏。在推覆体前缘，构造复杂。不仅煤层原生结构遭到破坏，而且煤层厚度也变得相当复杂，从而给煤田勘探和矿山开采带来了很大困难。但是，在原地系统中，构造简单、煤层厚度稳定，有利于勘探和开采。
In West Hill coal field of Beijing,there are three major thrust-nappes-Jiulongshan thrust-nappe,Miaoanling thrust-nappe and Zhaitang thrust-nappe,which were formed during the Early Yanshanian and transported from the margins to the center of the Basin.Jiulongshan thrust-nappe was located in the west of the basin and transported from NW to SE.Miaoanling thrustnappe and Zhaitang thrust-nappe were in the east and transported from SE to NW.They make up the combined style of ramp thrusts.Jiulongshan thrust-nappe among them is characterized by a duplex,which consists of two nappes.The lower nappe is composed of the Upper Paleozoic,which is well preserved and makes up piggyback imbricate fan.The upper nappe consists of the Proterozic,which is almost eroded up.During the Middle-Late Yanshanian,these thrust-nappes were further developed,and were cut and destroyed by some NNE-trending thrust-Huangtutai thrust,Yubai thrust,and so on.In the frontal edges of the nappes,the geologicl structure is very complicated,and the primary texture of the coal-seam was not only destroyed but its primary thickness was complexly changed,which causes the exploration of the coal field and the mining of the coal mines difficullt. In the autochthones, t!1e simple structure and the fairly steady coal-seam thickness favor the exploration and mining.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1996年第4期340-347,共8页
Geotectonica et Metallogenia
关键词
煤田
推覆构造
构造样式
成因
West Hill coal field,thrust-nappe,coal-controlling
