马边-雷波峨边-金阳大断裂构造特征及活动性
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摘要
地质调查中,利用断层泥石英颗粒形貌扫描分析及石英电子自旋共振(ESR)测年等方法对四川马边-雷波地区峨边-金阳大断裂的构造特征及活动性进行分析,认为该大断裂形成于燕山期后,总体呈南北走向,西倾,主体为由西向东脆性逆冲运动,是在区域隔挡式褶皱基础上进一步构造变形形成的走向断裂,由多条近于平行的逆冲断层呈叠瓦状组成。该断裂可划分出三个构造期次:第一期为由西向东逆冲运动,主断裂形成,第二期为右行剪切运动,第三期为左行拉张运动。该断裂中更新世以来活动性明显。
Study of the texture of fault gouge quartz grain surface under scanning electronic microscope and quartz electron spin resonance dating indicate that the Mabian-Leibo-Ebian-Jinyang major fault is a longitudinal fault consisting of multiple parallel imbricate thrusts formed based on regional wide-spread fold in the post-Yanshanian epoch.It may be divided into tectonically active phases:eastward thrust movement responsible for main fracture,right-lateral shear slide and left-lateral extensional faulting.It has been strong active since the Pleistocene.
Study of the texture of fault gouge quartz grain surface under scanning electronic microscope and quartz electron spin resonance dating indicate that the Mabian-Leibo-Ebian-Jinyang major fault is a longitudinal fault consisting of multiple parallel imbricate thrusts formed based on regional wide-spread fold in the post-Yanshanian epoch.It may be divided into tectonically active phases:eastward thrust movement responsible for main fracture,right-lateral shear slide and left-lateral extensional faulting.It has been strong active since the Pleistocene.
引文
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[3]四川省地质调查院.四川1:25万甘洛县幅区域地质修测报告[R],2013.
[4]安艳芬,韩竹军,万景林.川南马边地区新生代抬升过程的裂变径迹年代学研究[J].中国科学D辑:地球科学,2008,38(5):555-563.
[5]申俊峰,申旭辉,曹忠权,等.断层泥石英微形貌特征在断层活动性研究中的意义.矿物岩石[J],2007,27(1):90-96.
[6]杨主恩,胡碧茹,洪汉净.活断层中断层泥的石英碎砾的显微特征及其意义[J].科学通报,1984,29(8):484-486.
[7]俞维贤,王振,毛艳,等.程海断裂带断层泥中石英碎砾表面SEM特征及断层活动状态的分析[J].中国地震,2004,20(4):347-352.
[8]朱学强,吴德超.四川白玉县竹英-贡达断裂断层泥石英微观形貌研究[J].地质与资源,2010,19(1):58-62.
[9]陈艳.应用石英微形貌特征测定断层活动年龄[J].山西建筑,2012,38(5):99-100.
[10]张汝藩,杨主恩,等.扫描电镜与微观地质研究[M].北京市:学苑出版社,1999:57-62+180-181.
[11]Kanaori Y,Miyakoshi K,Kakuta T.Dating fault activity by surface textures of quartz grains from fault gouges[J].International Journal of Rock Mechanics and Mining Science&Geomechanics,1981,18(5):91.
[2]易桂喜,闻学泽,张致伟,等.川南马边地区强震危险性分析[J].地震地质,2010,32(2):282-293.
[3]四川省地质调查院.四川1:25万甘洛县幅区域地质修测报告[R],2013.
[4]安艳芬,韩竹军,万景林.川南马边地区新生代抬升过程的裂变径迹年代学研究[J].中国科学D辑:地球科学,2008,38(5):555-563.
[5]申俊峰,申旭辉,曹忠权,等.断层泥石英微形貌特征在断层活动性研究中的意义.矿物岩石[J],2007,27(1):90-96.
[6]杨主恩,胡碧茹,洪汉净.活断层中断层泥的石英碎砾的显微特征及其意义[J].科学通报,1984,29(8):484-486.
[7]俞维贤,王振,毛艳,等.程海断裂带断层泥中石英碎砾表面SEM特征及断层活动状态的分析[J].中国地震,2004,20(4):347-352.
[8]朱学强,吴德超.四川白玉县竹英-贡达断裂断层泥石英微观形貌研究[J].地质与资源,2010,19(1):58-62.
[9]陈艳.应用石英微形貌特征测定断层活动年龄[J].山西建筑,2012,38(5):99-100.
[10]张汝藩,杨主恩,等.扫描电镜与微观地质研究[M].北京市:学苑出版社,1999:57-62+180-181.
[11]Kanaori Y,Miyakoshi K,Kakuta T.Dating fault activity by surface textures of quartz grains from fault gouges[J].International Journal of Rock Mechanics and Mining Science&Geomechanics,1981,18(5):91.