汝州煤田逆冲推覆、滑覆构造的形态特征

汝州煤田位于华北板块南缘逆冲推覆构造带豫西段前锋部位,区内逆冲推覆构造较发育。其滑脱面倾角浅部较陡,深部较缓,表现为上陡下缓、凹面向上的铲状形态,向深部逐渐交汇于同一断裂。该区构造在剖面上时而出现断坡,时而出现断坪,其变化与岩层的软硬程度等因素有关。通过对逆冲推覆、滑覆构造的特征分析,推断出该区推覆下掩盖的二1煤体构造形态特征。

Pattern Characteristics of Thrusting Nappe, Decollement in Ruzhou Coalfield

The Ruzhou coalfield lies at the front part of thrusting nappe structural zone western Henan sector, south margin of the North China plate. Thrusting nappe structure is well developed in the area, dip angle of decollement planes are rather steep in shallow part, gentle in deep part showing a series of concave open upward shovel patterns and converging into a common decollement plane. Structures in the area are showing on sections as faulted slopes or faulted flats from time to time, varying related to soft or hard of rocks. Through characteristics analyses of thrusting nappe and decollement structures, deduced morphological features of the No.21 coal seam under the nappe and decollement.