郯庐断裂带的演化及其对西太平洋板块运动的响应
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摘要
首次从郯庐断裂带走滑糜棱岩中获得了白云母 1 2 7 62± 0 1 9Ma的40 Ar 39Ar年龄 ,其与糜棱岩的全岩40 Ar 39Ar年龄相吻合。这些年代学研究成果以及同走滑期岩浆活动 ,表明郯庐断裂带于早白垩世发生了大规模的左行平移。这一早白垩世构造—岩浆事件是伊泽纳崎板块突然发生高速、斜向俯冲的结果。晚白垩世 早第三纪郯庐断裂带转变成巨型的伸展构造 ,普遍控制发育了断陷盆地。太平洋板块的高角度正向俯冲使中国东部出现软流圈上涌、岩石圈拆沉 ,从而造成了郯庐断裂带与整个中国东部卷入了强烈的伸展活动。晚第三纪初期起动的挤压活动 ,使郯庐断裂带上的断陷盆地同步抬升和闭合 ;断裂带的逆冲活动则断续延至今日 ,成为中国东部最大的近代地震活动带。郯庐断裂带晚第三纪以来的挤压活动是西太平洋弧后扩张的响应 ,而印度板块碰撞的构造挤出起着辅助作用。
A muscovite 40 Ar 39 Ar age of 127.62±0.19 Ma was firstly obtained from strike slip mylonite in the Tan Lu fault, which was consistent with mylonite whole rock 40 Ar 39 Ar ages. The isotopic dating as well as syn strike slip magmatism showed that a large scale strike slip movement of the Tan Lu fault zone occurred in Early Cretaceous. The Early Cretaceous tectono magmatism event resulted from a suddenly high speed and oblique subduction of the Izanagi plate. The Tan Lu fault zone turned into a huge extensional structure during Late Cretaceous to Eogene, leading to a series of development of fault bounded basins. It was suggested that extensional activities of the Tan Lu fault zone might be related to asthenospheric upwelling and lithospheric delamination in East China caused by high angle, orthogonal subduction of the Pacific plate. The compressive activities from the earliest Neogene closed the above mentioned basins. The thrusting of the Tan Lu fault zone lasted to present days with several intervals. Therefore, the fault zone became the largest earthquake belt in East China. The post Eogene compressive activity was a response to backarc spreading in West Pacific area, and the extrusion from the Indian plate collision also played a partial role in the E W compression in East China.
A muscovite 40 Ar 39 Ar age of 127.62±0.19 Ma was firstly obtained from strike slip mylonite in the Tan Lu fault, which was consistent with mylonite whole rock 40 Ar 39 Ar ages. The isotopic dating as well as syn strike slip magmatism showed that a large scale strike slip movement of the Tan Lu fault zone occurred in Early Cretaceous. The Early Cretaceous tectono magmatism event resulted from a suddenly high speed and oblique subduction of the Izanagi plate. The Tan Lu fault zone turned into a huge extensional structure during Late Cretaceous to Eogene, leading to a series of development of fault bounded basins. It was suggested that extensional activities of the Tan Lu fault zone might be related to asthenospheric upwelling and lithospheric delamination in East China caused by high angle, orthogonal subduction of the Pacific plate. The compressive activities from the earliest Neogene closed the above mentioned basins. The thrusting of the Tan Lu fault zone lasted to present days with several intervals. Therefore, the fault zone became the largest earthquake belt in East China. The post Eogene compressive activity was a response to backarc spreading in West Pacific area, and the extrusion from the Indian plate collision also played a partial role in the E W compression in East China.
引文
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陈义贤.1985.辽河裂谷盆地断裂演化序次和油气藏形成模式.石油学报,6(2):1—11.ChenYixian.1985.TheevolutionoffaultsandformationofoilandgasreservoirsintheLiaoheriftvalley.ActaPetroleiSinica,6(2):1—11.
国家地震局地质研究所.1987.郯庐断裂.北京:地震出版社.83—141.InstituteofGeology,StateSeismologicalBureau.1987.TheTanLuFaultZone.Beijing:SeismologicalPress.83—141.
国家地震局中国地震区划图编委会.1991.中国及邻区地震震源机制图及说明书.北京:地震出版社.2—11.CommissionofEarthquakeDivision,StateSeismologicalBureau.1991.FocalMechanismsandInterpretationinChinaandItsAdja centAreas.Beijing:SeismologicalPress.2—11.
胡世玲,邹海波,周新民.1993.安徽歙县堇青石花岗岩和江西德兴钠长花岗岩中白云母和青铝闪石的40Ar39Ar年龄及其地质意义.见:李继亮主编,东南大陆岩石圈结构与地质演化.北京:冶金工业出版社.141—144.HuShiling,ZouHaiboandZhouXinmin.1993.40Ar39ArmuscoviteandhornblendeagesrespectivelyfromcordieritegraniteatShexian,AnhuiandalbitegraniteatDexing,Jiangxi.in:LiJiliang.ed.LithosphericTexturesandGeologicalEvolutionoftheSoutheastChina.Beijing:MetallurgicalIndustryPubl.House.141—144.
李家灵,高维明,孙竹友.1984.沂沭裂谷消亡与华北裂谷新生代构造应力场.构造地质论丛,(3):318—327.LiJialing,GaoWeimingandSunZhuyou.1984.TerminationoftheYishuvalleyandCenozoicstressfieldoftheNorthChinariftval ley.CollectionofStructuralGeology,(3):318—327.
李开善.1987.郯庐断裂带构造应力场初步探讨.中国地质科学院562综合大队集刊,(6):127—137.LiKaishan.1987.ApreliminaryexplorationonthetectonicstressfieldofTanLufaultzone.Bulletinofthe562ComprehensiveGeo logicalBrigade,ChineseAcademyofGeologicalSciences,(6):127—137.
李学明,李彬贤,张 巽,周泰禧.1985.安徽管店岩体的同位素地质年龄和郯庐断裂的动力变质作用.中国科技大学学报,15(增刊):254—261.LiXueming,LiBinxian,ZhangXunandZhouTaixi.1985.IsotopicagesoftheGuangdianintrusioninAnhuianddynamo metamorphismintheTanLufaultzone.JouranlofChinaUniversityofScienceandTechnology,15(Suppl.):254—261.
刘茂强,杨丙中,邓俊国,周永辉.1993.伊通—舒兰地堑地质构造特征及其演化.北京:地质出版社.42—84LiuMaoqiang,YangBingzhong,DengJunguoandZhouYonghui.1993.GeologicalTectonicFeaturesandEvolutionofYitongShulanGraben.Beijing:GeologicalPubl.House.42—84.
牛漫兰.2001.郯庐断裂带中—南段岩浆活动与深部过程[博士学位论文].合肥:合肥工业大学.14—60.NiuManlan.2001.MagmaticActivitiesandDeepProcessesintheMiddleSouthernPartoftheTanLuFaultZone(DoctorialDegreeThesis).Hefei:HefeiUniversityofTechnology.14—60.
牛漫兰,朱 光,刘国生,王道轩,宋传中.2002.郯庐断裂带中南段中生代岩浆活动的构造背景与深部过程.地质科学,37(4):393—404.
NiuManlan,ZhuGuang,LiuGuosheng,WangDaoxuanandSongChuanzhong.2002.TectonicsettinganddeepprocessesofMesozoicmagmaticactivityinthemiddle southernpartoftheTanLufaultzone.ChineseJour.Geol.,37(4):393—404.
邱检生,王德滋,周金城,曾家湖.1996.山东中生代橄榄安粗岩系火山岩的地质、地球化学特征及岩石成因.地球科学,21(5):546—552.
QiuJiansheng,WangDezi,ZhouJinchengandZengJiahu.1996.GeologicalandgeochemicalcharacteristicsandpetrologicalgenesisofMesozoicshoshoniteseriesinShandong.EarthScience,21(5):546—552.
苏尚国,周若,顾德林.1999.山东沂水郯庐断裂带中段中生代火山岩特征及演化.地质论评,45(增刊):565—571.
SuShangguo,ZhouXunruoandGuDelin.1999.CharacteristicsandevolutionofMesozoicvolcanicrocksinthemiddlesegmentoftheTanLufaultzoneatYishui,Shandong.Geol.Rev.,45(Suppl.):565—571.
万天丰,朱 鸿.1996.郯庐断裂带的最大左行走滑断距及其形成时期.高校地质学报,2(1):14—27.
WanTianfengandZhuHong.1996.Themaximumsinistralstrike slipdisplacementandformationtimeoftheTanLufaultzone.Ge ologicalJournalofChinaUniversities,2(1):14—27.
王小凤,李中坚,陈柏林,陈宣华,董树文,张 青.2001.郯庐断裂带.北京:地质出版社.15—59.WangXiaofeng,LiZhongjian,ChenBolin,ChenXuanhua,DongShuwenandZhangQing.2001.OnTanLuFaultZone.Beijing:GeologicalPubl.House.15—59.
徐嘉炜.1984.郯城—庐江平移断裂系统.构造地质论丛,(3):18—22.XuJiawei.1984.TanchengLujingwrenchfaultsystem.CollectionofStructuralGeology,(3):18—22.
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