鄂尔多斯盆地延安组控煤古构造趋势分析  

TREND SURFACE ANALYSIS OF THE CONTROL OF PALEOTECTONICS TO COAL ACCUMULATION OF YANAN FORMATION IN ORDOS BASIN

作　　者：李恒堂[1] 吕志发[1] 

机构地区：[1]煤炭科学研究总院西安分院

出　　处：《煤田地质与勘探》1996年第5期5-8,共4页Coal Geology & Exploration

摘　　要：利用趋势面分析对延安组地层厚度和煤层总厚两个地质变量进行了拟合分析，其结果表明：早中侏罗世聚煤盆地的形成和发展，主要受燕山期北西向挤压构造应力场控制。聚煤拗陷的总体方向呈ＮＥ３５°，区域富煤带的展布方向与其大体一致。吴忠—盐池—绥德为一分隔线。以北，次级构造的展布方向与煤层次级增厚带和减薄带的方向一致；以南，二者关系较复杂。The result of trend surface analyses of two geological variables,the general thickness of strata and the one of coal beds of Yanan formation ,indicates that forming and developing of coal bearing basin in early middle Jurassic were controled mainly by the paleotectonic pressure stress field of Yanshan movement.The general spread direction of coalbearing basin was NE35°,which was in accordence with the one of regional coal rich belts.A evident separate line existed from Wuzhong,Yanchi,to Suide (near north latitude 38°):in the north of it,the spread direction of secondary tectonics evidently in a line with the one of secondary thicking and thinning belts of coal beds,and in the south of it,the relationship between them was more complexed,which reflected the important influence of paleotopographic features formed by paleotectonic pattern of Indo China movement.

关 键 词：构造控制 聚煤作用 鄂尔多斯盆地 煤矿床 

分 类 号：P618.110.2[天文地球—矿床学]