【作者】 姚大全； 赵朋； 杨源源； 郑海刚； WANG Xingzhou； MIAO Peng； LI Junhui；

【Author】 YAO Da-quan;ZHENG Hai-gang;ZHAO Peng;YANG Yuanyuan;WANG Xingzhou;MIAO Peng;LI Junhui;Seismological Administration of Anhui Province;

【机构】 安徽省地震局； Seismological Administration of Anhui Province；

【摘要】 探槽揭示郯庐断裂带安徽明光孙庄一带第四纪以来的新活动,表现为张裂楔和地震断层。根据现场现象的综合分析,初步认为:首先是顺断裂上侵岩脉,然后断层上盘向西逆冲,生成构造挤压带,当第四系沉积后,主断面上方发生张裂活动,形成张裂楔,上覆的黄土和黑土垮落充填其间。张裂楔向下切穿断面。与此同时,地震断层小幅度错开黑土层。表明郯庐断裂带在淮河以南晚第四纪有过显著活动。这一新发现和初步认识有助于了解和把握郯庐断裂带南段的新活动习性。当然这些有待于年代样品测试和原态微观观测分析结果进一步证实。更多还原

【Abstract】 New activities since Quaternary are discoveied by the trenches Tancheng-Lujiang fault zone,Sunzhuantg of Mingguang country,Anhui Province,expressed for tension fracture wedge and seismic fault.Based on comprehensive analysis of the phenomenon on site,preliminary view that:At first the dike was uptrusion along the fault,then the hanging wall of the fault was westward thrust,generated tectonic compression zone,after Quaternary depositing,the tension activity occurred above the fault plane,the tension fracture wedge was formed,the loess and soil collapse of the overlying filling in the course.the splitting wedge cut down the fault plane.Meanwhile,an earthquake fault small black soil layers staggered.It is said that late Quaternary in the Tan-lu fault zone in the south of the Huai River has been significant activity.This new discovery and understanding to help understand and grasp new activity habit of the fault zone in the southern segment.although known to be above subject to confirmed by the age of the samples tested and results of the analysis of the microscopic observation.更多还原