地震研究

郯庐断裂带安丘—莒县断裂南段(郯城—淮河)晚第四纪活动特征^*

(郯城—淮河)晚第四纪活动特征^*] 曹筠^1,2,冉勇康²,许汉刚³,李彦宝²,马兴全²,张鹏³,李丽梅³ (1.河北省地震局,河北石家庄 050021; 2.中国地震局地质研究所活动构造与火山重点实验室,北京 100029; 3.江苏省地震局,江苏南京 210014)

关键词：郯庐断裂带; 安丘—莒县断裂; 浅部构造格架; 断层活动性

Late Quaternary Activity in the Southern Segment of the Anqiu-Juxian Fault of the Tan-Lu Fault Zone

CAO Jun^1,2,RAN Yongkang²,XU Hangang³,LI Yanbao²,MA Xingquan²,ZHANG Peng³,LI Limei³

(1. Hebei Earthquake Agency,Shijiazhuang 050021,Hebei,China)(2. Key Laboratory of Active Fault and Volcano,Institute of Geology,China Earthquake Administration,Beijing 100029,China)(3. Jiangsu Earthquake Agency,Nanjing 210014,Jiangsu,China)

Keywords：the Tan-Lu Fault Zone; the Anqiu-Juxian fault; shallow structural framework; fault activity

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通过系统的野外地质地貌调查、浅层地震勘探、钻孔联合剖面和古地震探槽等多方法手段,重点开展郯庐断裂带安丘—莒县断裂南段晚第四纪活动特征研究。结果显示安丘—莒县断裂南段在浅部由2支高倾角兼有挤压逆冲分量的断层组成,其中一支出露地表,以右旋走滑运动为主兼有逆冲分量,是全新世活动断层,而另一支为晚更新世活动断层。

In this paper,based on field geological investigations,shallow seismic exploring,composite drilling and paleoseismic trenching,we focus on structural framework and late Quaternary activity in the southern segment of the Anqiu-Juxian fault. The results show that the Anqiu-Juxian fault is composed of two high dip branch fault in the shallow. Both branch faults are shown as the reversed fault in the profile. One of them that has outcrop shows a right-lateral strike-slip fault in the plane. The exposed branch fault is a Holocene active fault,and the other is late Pleistocene active fault.

引言
1 郯庐断裂带鲁苏沂沭段几何结构与晚第四纪活动性概述
2 安丘—莒县断裂南段浅部构造格架和晚第四纪活动特征
3 安丘—莒县断裂南段浅部构造样式和晚第四纪活动特征讨论
4 结论

图1 中国活动构造图(邓起东等,2007)图(a)及鲁苏沂沭断裂带南段(郯城—淮河)构造略图(b)<br/>Fig.1 Map of active tectonics of China(a)and tectonic map of southern segment of the Yishu Fault Zone(b)

图1 中国活动构造图(邓起东等,2007)图(a)及鲁苏沂沭断裂带南段(郯城—淮河)构造略图(b)
Fig.1 Map of active tectonics of China(a)and tectonic map of southern segment of the Yishu Fault Zone(b)

图2 安丘—莒县断裂航片及解译图<br/>Fig.2 Aerial photographs and its interpretation of the Anqiu-Juxian Fault

图2 安丘—莒县断裂航片及解译图
Fig.2 Aerial photographs and its interpretation of the Anqiu-Juxian Fault

图3 安丘—莒县断裂冲沟右旋位错图(a)、断层反向陡坎图(b)和冲沟右旋位错测量图(c)<br/>Fig 3 Typical right lateral geomorphic markers(gully)along the Anqiu-Juxian Fault(a),fault scarp(b)and survey plan of right lateral gully(c)

图3 安丘—莒县断裂冲沟右旋位错图(a)、断层反向陡坎图(b)和冲沟右旋位错测量图(c)
Fig 3 Typical right lateral geomorphic markers(gully)along the Anqiu-Juxian Fault(a),fault scarp(b)and survey plan of right lateral gully(c)

图4 郯城麦坡处(a)、新沂何庄村处(b)、马陵山处(c)、新沂河阶地处(d)和重岗山处(e)断层以及安丘—莒县断裂南段沿线断层露头和测线位置图(f)(图a中蓝圈为一人高)<br/>Fig.4 Fault outcrop located at Tancheng Maipo(a),Hezhuang village(b),Maling mountain(c),Xinyiriver(d),Chonggang mountain(e),and location of typical outcrop and shallow seismic line along the southern segment of the Anqiu-Juxian Fault(f)(the blue circle is the height of one person)

图4 郯城麦坡处(a)、新沂何庄村处(b)、马陵山处(c)、新沂河阶地处(d)和重岗山处(e)断层以及安丘—莒县断裂南段沿线断层露头和测线位置图(f)(图a中蓝圈为一人高)
Fig.4 Fault outcrop located at Tancheng Maipo(a),Hezhuang village(b),Maling mountain(c),Xinyiriver(d),Chonggang mountain(e),and location of typical outcrop and shallow seismic line along the southern segment of the Anqiu-Juxian Fault(f)(the blue circle is the height of one person)

图5 测线AQ1和地质解释图(a)、测线AQ2和地质解释图(b)、测线AQ3和地质解释图(c)、测线AQ4和地质解释图(d)、测线AQ5和地质解释图(e)、测线AQ6和地质解释图(f)以测线AQ7和地质解释图(g)(据许汉刚等(2016)修改)<br/>Fig.5 Map of survey line AQ1 and geologic interpretation(a),map of survey line AQ2 and geologic interpretation(b),map of survey line AQ3 and geologic interpretation(c),map of survey line AQ4 and geologic interpretation(d),map of survey line AQ5 and geologic interpretation(e), map of survey line AQ6 and geologic interpretation(f)and map of survey line AQ7 and geologic interpretation(g)(Modified from Xu et al(2016))

图5 测线AQ1和地质解释图(a)、测线AQ2和地质解释图(b)、测线AQ3和地质解释图(c)、测线AQ4和地质解释图(d)、测线AQ5和地质解释图(e)、测线AQ6和地质解释图(f)以测线AQ7和地质解释图(g)(据许汉刚等(2016)修改)
Fig.5 Map of survey line AQ1 and geologic interpretation(a),map of survey line AQ2 and geologic interpretation(b),map of survey line AQ3 and geologic interpretation(c),map of survey line AQ4 and geologic interpretation(d),map of survey line AQ5 and geologic interpretation(e), map of survey line AQ6 and geologic interpretation(f)and map of survey line AQ7 and geologic interpretation(g)(Modified from Xu et al(2016))

图6 AQ3测线场地位置图(a)、F5-1钻孔联合剖面位置图(b)和F5-2钻孔联合剖面位置图(c)
Fig.6 Site location map of survey line AQ3(a),location of composite drilling profile of the Fault F5-1(b)and location of the composite drilling profile of the Fault F5-2(c)

图7 沿AQ3测线探测F5-1的钻孔剖面揭露断层<br/>Fig.7 A fault revealed by exploring F5-1 drilling section along the AQ3 line

图7 沿AQ3测线探测F5-1的钻孔剖面揭露断层
Fig.7 A fault revealed by exploring F5-1 drilling section along the AQ3 line

图8 测线AQ3北侧探槽(34°0'51.32″N,118°18'23.08″E)北壁剖面及解释图(据曹筠等(2015)修改)<br/>Fig.8 Map of north wall trench of the AQ3 line on the northern side and its interpretation (Modified from Cao et al.(2015))

图8 测线AQ3北侧探槽(34°0'51.32″N,118°18'23.08″E)北壁剖面及解释图(据曹筠等(2015)修改)
Fig.8 Map of north wall trench of the AQ3 line on the northern side and its interpretation (Modified from Cao et al.(2015))

图9 沿AQ3测线断层F5-2钻孔联合剖面(断层附近红字代表对应层位的断距)<br/>Fig.9 Composite drilling section exploring the FaultF5-2 along the AQ3 line(red words represent fault displacement of the corresponding layers)

图9 沿AQ3测线断层F5-2钻孔联合剖面(断层附近红字代表对应层位的断距)
Fig.9 Composite drilling section exploring the FaultF5-2 along the AQ3 line(red words represent fault displacement of the corresponding layers)

图10 AQ5测线场地位置图(a)、F5-1钻孔联合剖面位置图(b)和F5-2钻孔联合剖面位置图(c)
Fig.10 Site location map of the line AQ5(a),location of composite drilling profile of the Fault F5-1(b) and location of composite drilling profile of the Fault F5-2(c)