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  杨源源,姚大全,郑海刚,赵朋,方震,汪小厉,李军辉.郯庐断裂带明光—定远池河镇段的新活动性[J].震灾防御技术,2019,14(1):152-163, DOI:10.11899/zzfy20190115.

郯庐断裂带明光—定远池河镇段的新活动性
摘要:    郯庐断裂带南段淮河至女山湖段落已被证实具有晚第四纪活动性,为进一步追踪断裂带在女山湖以南的活动情况,选取明光至定远池河镇段落进行遥感解译、地质地貌调查、探槽开挖及年代样品测试等工作。研究发现,该段断裂在卫星影像上显示线性特征较差,发育断裂主要为池河-太湖断裂;断裂新活动主要表现为控制池河河谷的发育及沿明南土山村、池河石塘岳、池河周王等地展布的线性岗状地貌;在上述岗地边缘开挖探槽揭示断裂在该段最新活动方式具挤压逆冲性质,最新活动时代为中更新世,晚更新世以来不活动。上述结果初步表明,该段与其北侧相邻的淮河至女山湖段在第四纪活动性上存在差异,可能为郯庐断裂带在女山湖附近存在分段导致。
作者单位
杨源源 安徽省地震局, 合肥 230031;郯庐断裂带中南段重点研究室, 合肥 230031 
姚大全 安徽省地震局, 合肥 230031 
郑海刚 安徽省地震局, 合肥 230031;郯庐断裂带中南段重点研究室, 合肥 230031 
赵朋 安徽省地震局, 合肥 230031;郯庐断裂带中南段重点研究室, 合肥 230031 
方震 安徽省地震局, 合肥 230031 
汪小厉 安徽省地震局, 合肥 230031 
李军辉 安徽省地震局, 合肥 230031 
关  键  词:郯庐断裂带  池河-太湖断裂  新活动  探槽  女山湖
DOI:10.11899/zzfy20190115
基金项目:国家自然科学基金项目(41802224),安徽省公益性地质项目“郯庐断裂带(安徽段)重点地段第四纪新活动及介质速度结构探查评价”(2015-g-25),安徽省地震科技创新专项(CX201803)
收稿日期:2018-04-18
作者简介:杨源源,男,生于1988年。工程师。主要从事活动构造、地震预测研究工作。E-mail:yuanyuanyang_1988@126.com
通讯作者:赵朋,男,生于1982年。工程师。主要从事活动构造、地震安全性评价研究工作。E-mail:zp20031688@163.com
New Activity of the Mingguang-Chihe Segmented of the Tanlu Fault Zone in Anhui Province
Abstract:      The section of Huaihe River to Nvshan Lake in the southern part of Tanlu fault zone has been beleived to be of late Quaternary activity. To trace further the activity of the fault to the south of the Nvshan Lake, we selected Mingguang south to Chihe Town section to conduct remote sensing interpretation, geological survey, trench excavation and age sample analysis. The results show that the linear features of this section are poor, and the main faults are the Chihe-Taihu fault. The new activities of the fault are mainly manifested as the control of the development of the valley of Chihe River and the hillock geomorphology along the Tushan Village in the Minguang Town, Shi Tangyue and Zhouwang Village in the Chihe Town. Excavation of trenches at the edge of the hillock revealed that the latest mode of activity of the fault in this segment is characterized by crushing and thrusting. The latest tectonic activity of the fault was the middle Pleistocene and inactivity since the late Pleistocene. The above preliminarily results show that exists the difference in Quaternary activity between this section and the Huaihe-Nvshan Lake section adjacent to the north side, possibly resulting from the subdivision of the Tanlu fault zone near the Nvshan Lake.
Keywords:  Tanlu fault zone  Chihe-Taihu fault  New activity  Trench  Nvshan lake
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