太行山重力梯级带的密度结构及其地质解释
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摘要
斜贯中国东部地区的大兴安岭 -太行山 -武陵山重力梯级带是一条地壳深部构造变异带。选择与其中段———太行山重力梯级带相垂直的阜平 -定州剖面 ,利用人工地震测深与布格重力异常资料 ,进行了地壳 -上地幔密度反演分析。结果表明 ,该剖面的地壳 -上地幔密度分布具有明显的不均匀性。总体特征是剖面西部密度较低 ,东部密度较高 ,地壳厚度的横向变化基本上决定了布格重力异常梯级带的形成。结合华北地区的中新生代构造演化 ,认为太行山重力梯级带是燕山期以后形成的 ,它与板块之间的相互作用及上地幔热物质的运动相关。
In eastern China, there is a great gravity anomaly zone which extends from the Daxinganling Mountains, through the Taihang Mountains to the Wuling Mountains. This zone is presumably associated with the structural variation in the deep crust. We select the Fuping Dingzhou profile, which is perpendicular to this gravity anomaly zone, to make an inversion analysis of the crust upper mantle density using the data of seismic sounding and Bouguer anomaly. The result shows that the density distribution of the crust and upper mantle along this profile is evidently heterogeneous. The general feature is that the density is relatively low in the west and high in the east. The lateral variation of the crustal thickness basically determines the generation of the Bouger gravity anomaly zone. Taken the Mesozoic and Cenozoic tectonic evolution of North China into account, it is suggested that this gravity anomaly zone was developed after the Yanshan period and associated with plate interaction and thermal mass transfer of the upper mantle.
In eastern China, there is a great gravity anomaly zone which extends from the Daxinganling Mountains, through the Taihang Mountains to the Wuling Mountains. This zone is presumably associated with the structural variation in the deep crust. We select the Fuping Dingzhou profile, which is perpendicular to this gravity anomaly zone, to make an inversion analysis of the crust upper mantle density using the data of seismic sounding and Bouguer anomaly. The result shows that the density distribution of the crust and upper mantle along this profile is evidently heterogeneous. The general feature is that the density is relatively low in the west and high in the east. The lateral variation of the crustal thickness basically determines the generation of the Bouger gravity anomaly zone. Taken the Mesozoic and Cenozoic tectonic evolution of North China into account, it is suggested that this gravity anomaly zone was developed after the Yanshan period and associated with plate interaction and thermal mass transfer of the upper mantle.
引文
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XUJie,GAOZhan wu,SUNJian bao,etal.2001.Discussiononcouplingrelationofbasin mountainintheregimeofregionalextension〔J〕.ActaGeologicaSinica,75(2):165—174(inChinese).
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袁宝印,孙建中.1980.华北新生代沉积与断块构造〔A〕.见:张文佑主编.华北断块区的形成与发展.北京:科学出版社.221—229.
YUANBao yin,SUNJian zhong.1980.TheCenozoicsedimentationandblock faultingstructuresinNorthChina〔A〕.In:ZHANGWen you(Chiefed.).FormationandDevelopmentoftheNorthChinaFaultBlockRegion.SciencePress,Beijing.221—229(inChinese).
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ZHOUGuo fan,WURong yuan,WUChao jun.1985.AnalysisforthegravityandmagneticfieldsoftheTaihangMountaingravityanomalyzoneanddeepstructure〔J〕.BulletinofWuhanGeologicalCollege,10(4):1—10(inChinese).
周姚秀,刘文锦.1979.我国区域重力场及其基本特征〔J〕.物探与化探,(1):14—17.
ZHOUYao xiu,LIUWen jin.1979.RegionalgravityfieldanditsbasicfeaturesofChina〔J〕.GeophsicalandChemicalExploration,(1):14—17(inChinese).
FENGRui,YANHui fen,ZHANGRuo shui,etal.1986.Fastinversionmethodandprogramdesignofthree di mensionalpotentialfield〔J〕.ActaGeologicaSinica,60(4):390—403(inChinese).
冯锐,郑书真,王均,等.1989.华北地区重力场与沉积构造〔J〕.地球物理学报,32(4):385—398.
FENGRui,ZHENGShu zhen,WANGJun,etal.1989.GravityfieldandsedimentarystructureofNorthChina〔J〕.ActaGeophysicaSinica,32(4):385—398(inChinese).
李安然,成福元,古成志,等.1984.中国东部重力梯级带的地震地质分析〔J〕.地震地质,6(2):53—61
LIAn ran,CHENGFu yuan,GUCheng zhi,etal.1984.GeologicalanalysisofthegravityanomalyzoneineasternChina〔J〕.SeismologyandGeology,6(2):53—61(inChinese).
黎益仕,殷秀华,刘占坡.1996.对应分析约束下的重磁联合反演及其在塔里木盆地的应用〔J〕.地震地质,18(4):361—367.
LIYi shi,YINXiu hua,LIUZhan po.1996.SimultaneausinversionofgravimetricandmagneticdataconstrainedwithinternalapplicationtotheTarimBasin〔J〕.SeismologyandGeology,18(4):361—367(inChinese).
刘光夏,赵文俊,王敬禹,等.1988.京津及河北省中部的重力三维正演结果及其地质意义〔J〕.地震学报,10(1):39—48.
LIUGuang xia,ZHAOWen jun,WANGJing yu,etal.1988.Three dimensionalforwardresultsofgravityforBeijing,TianjinandmiddleHebeiProvinceandtheirgeologicalimplications〔J〕.ActaSeismologicaSinca,10(1):39—48(inChinese).
刘占坡,殷秀华,刘铁胜.1993.利用重力资料研究临汾及其周围地区地壳上地幔结构特征〔A〕.见:马宗晋主编.山西临汾地震研究与系统减灾.北京:地震出版社.
LIUZhan po,YINXiu hua,LIUTie sheng.1993.AstudyonthefeaturesofthecrustalanduppermantlestructureinLinfenanditsneighboringareasusinggravitydata〔A〕.In:MAZong jin(Chiefed.).EarthguakeResearchandSystematicDisasterReductioninLinfen,Shanxi.SeismologicalPress,Beijing(inChinese).
马杏垣,刘昌铨,刘国栋主编.1991.江苏响水至内蒙古满都拉地学断面〔Z〕.北京:地质出版社.
MAXing yuan,LIUChang quan,LIUGuo dong(Chiefeds).1991.GlobalGeoscienceTransect,Xiangshui,JiangsutoMandal,NeiMongol〔Z〕.GeologicalPublishingHouse,Beijing(inChinese).
马杏垣主编.1987.中国岩石圈动力学纲要〔M〕.北京:地质出版社.
MAXin yuan(Chiefed).1987.AnOutlineoftheLithosphericDynamicsofChina〔M〕.GeologicalPublishingHouse,Beijing(inChinese).
任纪舜,姜春发,张正坤,等.1980.中国大地构造及其演化〔M〕.北京:科学出版社.
RENJi shun,JIANGChun fa,ZHANGZheng kun,etal.1980.GeotectonicsofChinaanditsevolution〔M〕.Sci encePress,Beijing(inChinese).
徐杰,高战武,孙建宝,等.2001.区域伸展体制下盆-山构造耦合关系的探讨〔J〕.地质学报,75(2):165—174.
XUJie,GAOZhan wu,SUNJian bao,etal.2001.Discussiononcouplingrelationofbasin mountainintheregimeofregionalextension〔J〕.ActaGeologicaSinica,75(2):165—174(inChinese).
薛嘉庆.1983.最优化原理与方法〔M〕.北京:冶金工业出版社.
XUEJia qing.1983.PrincipleandMethodofOptimization〔M〕.MetallurgicalIndustryPress,Beijing(inChi nese).
袁宝印,孙建中.1980.华北新生代沉积与断块构造〔A〕.见:张文佑主编.华北断块区的形成与发展.北京:科学出版社.221—229.
YUANBao yin,SUNJian zhong.1980.TheCenozoicsedimentationandblock faultingstructuresinNorthChina〔A〕.In:ZHANGWen you(Chiefed.).FormationandDevelopmentoftheNorthChinaFaultBlockRegion.SciencePress,Beijing.221—229(inChinese).
周国藩,吴蓉元,吴朝均.1985.太行山重力梯级带的重磁场特征及深部构造分析〔J〕.地球科学(武汉地质学院学报),10(4):1—10.
ZHOUGuo fan,WURong yuan,WUChao jun.1985.AnalysisforthegravityandmagneticfieldsoftheTaihangMountaingravityanomalyzoneanddeepstructure〔J〕.BulletinofWuhanGeologicalCollege,10(4):1—10(inChinese).
周姚秀,刘文锦.1979.我国区域重力场及其基本特征〔J〕.物探与化探,(1):14—17.
ZHOUYao xiu,LIUWen jin.1979.RegionalgravityfieldanditsbasicfeaturesofChina〔J〕.GeophsicalandChemicalExploration,(1):14—17(inChinese).
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