沈阳长白乡-观音阁断裂、抚顺浑河断裂的定位和活动性研究

本文基于对沈阳长白乡-观音阁断裂,以及抚顺浑河断裂开展的1:10000地质地貌填图工作,获得了这两条断裂在最老第四纪地层热释光的测年结果,它们分别为(112±6.7)ka和(150±9.0)ka。长白乡-观音阁断裂为一沿丘陵山地前缘分布的断裂,由2—3条分支断裂组成,最新的断面活动显示为压扭性正断层性质。断裂在晚更新世坡洪积扇堆积形成以来没有活动显示。3条浅层人工地震测线探测结果表明,其上断点均未错断第四系上更新统底界。断裂为中更新世活动断裂,晚更新世以来没有活动。浑河断裂为一沿丘陵山地前缘分布的断裂,由3—4条分支断裂组成,最新的断面活动显示为压扭性正断层性质。断裂在晚更新世坡洪积扇堆积形成以来没有活动显示。5条浅层人工地震测线探测结果表明,其上断点均在第四系上更新统底界以下。断裂为中更新世活动断裂,晚更新世以来没有活动。

The Study on Location and Activity of Changbaixiang-Guangyinge Fault in Shenyang and Hunhe Fault in Fushun

Based on 1:10000 geological mapping project in Shenyang and Fushun areas,we obtain the new evidences on active characteristics of Changbaixiang-Guangyinge fault(F6)in Shenyang city and hunhe fault(F1) in Fushun city.With the application of thermoluminescence(TL)dating technique,the last active times of these two faults in study area are believed to be 112±6.7 ka and 150±9.0 ka respectively.F6 fault consists of 2 to 3 secondary faults in front of mounting area,and is in the compression-twist normal faulting mode.F1 fault is also characterized by compression-twist normal faulting,and composed with 3 to 4 secondary faults in front of mounting area.