麻城-团风断裂带中段新活动特征及构造变形机制研究
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摘要
通过对麻城-团风断裂带中段构造地貌、水系及断裂带特征的调查,应用地震地质学方法分析了其第四纪活动特征,并结合研究区地震震源深度剖面,讨论了麻城-团风断裂带中段构造变形机制。初步分析认为,麻城-团风断裂中段最新活动时代主要在中更新世中-晚期,晚更新世有减弱趋势,活动方式以正断为主,兼有右旋走滑分量;断裂中段水系右旋扭曲位移达2～3 km;麻城地震的分支断层受主干断层控制,在深部形成共同的滑脱面;壳幔尺度差异隆升和区域NE-NEE向主压应力场为该断裂正断兼走滑运动提供了动力来源。
On the basis of geological survey of tectonic landform and drainage as well as fault feature to the middle segment of Macheng-Tuanfeng fault belt,this paper involves its quaternary activity characteristic in seismology and geology and discusses on the tectonic deformation mechanism of the fault,combining the depth of earthquake source in study area.The preliminary analysis can be drawn from this study.The fault,which is characterized by normal faulting and right-lateral offset,is predominantly active in the middle Pleistocene and is weakening in the Late Pleistocene.The drainage offset is up to 2-3 km in the way of dextral motion.The host fault controls the branch fault and they share a sliping plane in the crust.The differential uplifting of crust and mantle depth,as well as regionally tectonic principal pressure stress field of NE-NEE orientation provide the fault motion with dynamic force source.
On the basis of geological survey of tectonic landform and drainage as well as fault feature to the middle segment of Macheng-Tuanfeng fault belt,this paper involves its quaternary activity characteristic in seismology and geology and discusses on the tectonic deformation mechanism of the fault,combining the depth of earthquake source in study area.The preliminary analysis can be drawn from this study.The fault,which is characterized by normal faulting and right-lateral offset,is predominantly active in the middle Pleistocene and is weakening in the Late Pleistocene.The drainage offset is up to 2-3 km in the way of dextral motion.The host fault controls the branch fault and they share a sliping plane in the crust.The differential uplifting of crust and mantle depth,as well as regionally tectonic principal pressure stress field of NE-NEE orientation provide the fault motion with dynamic force source.
引文
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10刘早学,李金平.麻城-团风剪切带的基本特征及形成时代初探[J].资源环境与工程,1993,1(7):38-45.(LiuZaoxue and Li Jinping.Preliminary research on basic char-acteristics and formation time of Macheng-Tuanfeng shearzone[J].Resources environment and engineering,1993,1(7):38-45)
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12王朴,等.大别山商麻断裂韧-脆性变形转换的时间约束及其构造意义[J].地球科学-中国地质大学学报,2008,33(2):174-182.(Wang Pu,et al.Zircon U-Pb geochro-nology of the Shangma fault,Dabie:constraints on thetransformation from ductile to brittle deformation,and itssignificance to the tectonic evolution of Dabie Orogenic Belt[J].Earth Science-Journal of China University of Geosci-ences,2008,33(2):174-182)
13汪素云,许忠淮.中国东部大陆的地震构造应力场[J].地震学报,1985,7(1):30-31.(Wang Suyun and XuZhonghuai.Seismo-tectonic stress field in east China[J].Acta Seismologica Sinica,1985,7(1):30-31)
①中国地震局地质研究所.中国地震局工程力学研究所,西气东输二线工程场地地震安全性评价报告[R].2008.
②中国地震台网中心,中国地震详目(1970年至2010年)[R].2010.
③湖北省地震局,湖北省台网地震目录(1970年至2010年)[R].2010.
2古成志.1932年湖北麻城黄土岗6级地震与麻城-团风断裂带的新活动[J].地壳形变与地震,1981,(2):83-90.(Gu Chengzhi.New activity of Macheng-Tuanfeng fault andHuangtugang earthquake of M6,1932,Hubei[J].CrustalDeformation and Earthquake,1981,(2):83-90)
3谢广林,等.阜阳-团风断裂带的活动性[J].西北地震学报,1980,2(3):48-56.(Xie Guanglin,et al.New activityof Fuyang-Tuanfeng fault belt[J].Northwestern Seismolog-ical Journal,1980,2(3):48-56)
4王清云,李安然,申重阳.1932年麻城6.0级强震的蕴育环境条件探讨[J].地壳形变与地震,1992,(4):78-84.(Wang Qingyun,Li Anran and Shen Chongyang.Study onthe seismogenic environment condition of the Macheng Ms6.0 earthquake in 1932[J].Crustal Deformation and Earth-quake,1992,12(4):78-84)
5申重阳,等.麻城1932年6.0级地震区地球物理场与深部环境研究[J].地壳形变与地震,1994,(3):65-73.(Shen Chongyang,et al.Study on geophysical field anddeep seismogenic environment of the Macheng earthquake(Ms=6.0)in 1932[J].Crustal Deformation and Earth-quake,1994,14(3):65-73)
6李安然,韩晓光.麻城-团风断裂带现代构造应力环境的讨论[J].地壳形变与地震,1984,(2):192-198.(Li An-ran and Han Xiaoguang.Discussion on the environment ofrecent tectonic stress of the Macheng-Tuanfeng fault zone innortheast Hubei[J].Crustal Deformation and Earthquake,1984,4(2):192-198)
7国家地震局震害防御司.中国历史强震目录(公元前23世纪-公元1911年)[M].北京:地震出版社,1995.(TheDepartment of Seismic Hazard Prevention,CEA.China his-torical strong earthquake catalogue[M].Beijing:Seismolog-ical Press,1995)
8熊继平.湖北地震史料汇考[M].北京:地震出版社,1986.(Xiong Jiping.Hubei historical earthquake materialsexploration[M].Beijing:Seismological Press,1986)
9刘锁旺,丁忠孝.湖北省地震志[M].北京:地震出版社,1990.(Liu Suowang and Ding Zhongxiao.Earthquake recordof Hubei province[M].Beijing:Seismological Press,1990)
10刘早学,李金平.麻城-团风剪切带的基本特征及形成时代初探[J].资源环境与工程,1993,1(7):38-45.(LiuZaoxue and Li Jinping.Preliminary research on basic char-acteristics and formation time of Macheng-Tuanfeng shearzone[J].Resources environment and engineering,1993,1(7):38-45)
11周汉文,等.麻城-团风剪切带活动初探[J].地学探索,1991,4(4):66-72.(Zhou Hanwen,et al.Exploration ofactivity of Macheng-Tuanfeng shear zone[J].Geoscienceexploration,1991,4(4):66-72)
12王朴,等.大别山商麻断裂韧-脆性变形转换的时间约束及其构造意义[J].地球科学-中国地质大学学报,2008,33(2):174-182.(Wang Pu,et al.Zircon U-Pb geochro-nology of the Shangma fault,Dabie:constraints on thetransformation from ductile to brittle deformation,and itssignificance to the tectonic evolution of Dabie Orogenic Belt[J].Earth Science-Journal of China University of Geosci-ences,2008,33(2):174-182)
13汪素云,许忠淮.中国东部大陆的地震构造应力场[J].地震学报,1985,7(1):30-31.(Wang Suyun and XuZhonghuai.Seismo-tectonic stress field in east China[J].Acta Seismologica Sinica,1985,7(1):30-31)
①中国地震局地质研究所.中国地震局工程力学研究所,西气东输二线工程场地地震安全性评价报告[R].2008.
②中国地震台网中心,中国地震详目(1970年至2010年)[R].2010.
③湖北省地震局,湖北省台网地震目录(1970年至2010年)[R].2010.
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