Characteristic of Quaternary Activities of Fuyang-Jiande Segment of Xiaoshan-Qiuchuan Fault
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摘要: 萧山-球川断裂是浙江地区1条大规模的北东向断裂，在该断裂附近曾发生过多次破坏性地震。本文通过地质调查、电法勘探和探槽开挖等方法，对萧山-球川断裂富阳—建德段第四纪活动性进行了研究。萧山-球川断裂富阳—建德段的遥感影像线性特征清楚，对地貌的控制作用较为明显，对山前的第四系发育有明显影响。通过对断裂露头剖面的分析，认为萧山-球川断裂富阳—建德段活动性质以走滑兼具逆冲为主。通过本次开挖的富阳峙山村探槽，结合ESR年龄测定，判定该断裂在第四纪早、中期有过活动，但未断错上覆中更新统上部地层，其最新活动时代为早、中更新世。Abstract: Xiaoshan-Qiuchuan fault in NE-direction is one of the large-scale faults in Hangzhou area, along which there have been many destructive earthquakes. The activity of this fault in Quaternary is an important reference for Hangzhou area in carrying out seismic prevention and mitigation work. Through field investigation, electric exploration and trench excavation, we have studied the Quaternary activities of Fuyang-Jiande segment of Xiaoshan-Qiuchuan fault. The Fuyang-Jiande segment of Xiaoshan-Qiuchuan fault shows clear lineation on remote sensing image, and has a significant effect on Quaternary development of the piedmont and the control effect on the landscape. The activity feature of Fuyang-Jiande segment of Xiaoshan-Qiuchuan fault is dominated by thrust and strike-slip inferred from the research on the fault exposed profile. Based on trench excavation which is located in Fuyang Zhishan village, combing electron spin resonance dating, we found that the fault was active in early and middle Quaternary, and it has not cut through the above strata of middle Pleistocene.
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图 1 萧山-球川断裂富阳-建德段地质简图1 2
Figure 1. The geological map of Fuyang-Jiande segment of Xiaoshan-Qiuchuan fault
图 2 萧山-球川断裂富阳—建德段三维卫星影像
Figure 2. Three-dimensional satellite image of Fuyang-Jiande segment of Xiaoshan-Qiuchuan fault
图 3 过萧山-球川断裂地质地貌剖面
Figure 3. Geologic and geomorphologic profile across Xiaoshan-Qiuchuan fault
图 4 灵桥镇高浦萧山-球川断裂地质剖面
①侏罗系黑褐色凝灰岩，竖向节理发育；②黄棕色花岗岩岩脉，发育于断裂东侧；③断裂破碎带，碎裂岩发育，中间发育1层灰白色松软断层物质。东侧破碎带呈淡黄色，下部发育透镜体，顶部发育韧性变形带；西侧破碎带呈红褐色
Figure 4. Geological section of Xiaoshan-Qiuchuan fault exposed in Gaopu, Linqiao town
图 5 桐庐县峙山村开挖探槽位置原始地貌
Figure 5. The primitive landscape of the trench at Zhishan village
图 6 萧山-球川断裂高密度电法剖面
Figure 6. The high density electrical sections of Xiaoshan-Qiuchuan fault
图 7 桐庐县峙山村探槽南壁镶嵌照片（a）及解译（b）
①黄褐色侏罗纪酸性火山岩；②高度风化破碎的黄褐色火山岩；③高度破碎的黄褐色火山岩夹大量灰黑色断层角砾岩条带，断层角砾呈粉末状；④深褐色黏土夹砂；⑤黄褐色黏土夹砂，底部含部分碎石；⑥灰白色砂质黏土，下部较为坚硬，上部粘性较好；⑦黄棕色砂质黏土；⑧红棕色黏土，局部富集铁锰结核；⑨含大块碎石的较松散坡积土
Figure 7. The mosaic photos (a) and interpretation (b) of the south wall of the trench at Zhishan village
图 8 富春江大坝东岸萧山-球川断裂地质剖面
①第四系；②奥陶系泥岩夹砂岩；③断层破碎带；④侏罗系凝灰岩
Figure 8. Geological section of Xiaoshan-Qiuchuan Fault exposed in the east coast of Fuchun river
图 9 建德市杨春桥镇萧山-球川断裂地质剖面
①青灰色薄层硅质岩、粉砂质硅质岩及粉砂质泥岩，节理发育；②破碎的青灰色薄层硅质岩、粉砂质硅质岩，节理密集，宽1m；③碎裂岩带，由碎裂岩组成的角砾和约1cm的半胶结-胶结的青灰色泥，宽20cm；④胶结的碎裂岩；⑤青灰色薄层硅质岩、粉砂质硅质岩及粉砂质泥岩压碎岩，节理发育；⑥青灰色细角砾岩带，夹有小砾石，砾石定向排列，与断面一致，宽1—2.5m；⑦青灰色薄层硅质岩、粉砂质硅质岩及粉砂质泥岩，节理发育
Figure 9. Geological section of Xiaoshan-Qiuchuan fault exposed in Yangchunqiao town
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邓起东, 卢造勋, 杨主恩, 2007.城市活动断层探测和断层活动性评价问题.地震地质, 29(2):189-200. doi: 10.3969/j.issn.0253-4967.2007.02.001 任俊杰, 张世民, 冉洪流, 2008.活断层定量资料在大震年发生率评定中的应用.震灾防御技术, 3(3):282-291. doi: 10.3969/j.issn.1673-5722.2008.03.011 姚琪, 陈汉林, 张微等, 2008.断层泥电子自旋共振测年在杭州城市活动断层探测中的应用.原子能科学技术, 42(7):658-661. http://d.old.wanfangdata.com.cn/Periodical/yznkxjs200807020 张微, 陈汉林, 李启敏等, 2008.基于遥感技术研究萧山-球川断裂带, 科技通报, 24(2):156-161. doi: 10.3969/j.issn.1001-7119.2008.02.003 浙江省地质矿产局, 1989.浙江省区域地质志.北京:地质出版社. -
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