苏北大陆科学钻探靶区重磁异常反演解释
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摘要
对江苏东海县毛北地区重、磁观测异常进行了处理和特征分析 ,并根据科学钻探主要目标体榴辉岩与其围岩有达 0 .9× 1 0 3kg/m3的明显密度差 ,进行了等效密度反演成像与综合地震约束反演计算 .给出了该地区重力异常模型 ,可作为综合地质与地球物理研究的一个基础
Based on the features of gravity and magnetic anomalies and the obvious difference of densities between eclogite observed at Maobei, one of the main targets of the continental deep scientific drilling, and the surrounding rocks, two inversions of the gravity anomalies are carried out, one of which is for the equivalent distribution of densities under no constraints, and another under the constraints of seismic data. The gravity models are given and can be taken as a base of further geological and geophysical research of this area.
Based on the features of gravity and magnetic anomalies and the obvious difference of densities between eclogite observed at Maobei, one of the main targets of the continental deep scientific drilling, and the surrounding rocks, two inversions of the gravity anomalies are carried out, one of which is for the equivalent distribution of densities under no constraints, and another under the constraints of seismic data. The gravity models are given and can be taken as a base of further geological and geophysical research of this area.
引文
[1] 杨文采,程振炎,陈国九等.苏鲁超高压变质带北部地球物理调查(Ⅰ)———深反射地震.地球物理学报,1999,42(1):41—52.YANGWenCai,CHENGZhenYan,CHENGuoJiu,etal.,GeophysicalinvestigationsinnorthernSuluUHPMbelt,PartI:deepseismicreflection,ChineseJ.Geophys.,1999,42(1):41—52.
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[11] FediM ,RapollaA .3Dinversionofgravityandmagneticdatawithdepthresolution.Geophysics,1999,64(2):452—460.
[12] CamachoAG ,MontesinosFG ,VieiraR .Gravityinversionbymeansofgrowingbodies.Geophysics,2000,65(1):95—101.
[2] 杨文采,方慧,程振炎等.苏鲁超高压变质带北部地球物理调查(Ⅱ)———非地震方法.地球物理学报,1999,42(4):508—519.YANGWenCai,FANGHui,CHENZhenYan,etal.,GeophysicalinvestigationsinnorthernSuluUHPMbelt,PartⅡ:non seismicmethods,ChineseJ.Geophys.,1999,42(4):508—519.
[3] 樊金涛,程振香.苏北榴辉岩变质变形模式与苏胶造山带的隆升机制.中国区域地质,1999,18(2):162—174.FANJinTao,CHENGZhenXiang.AmodelofmetamorphismanddeformationofeclogitesinnorthernJiangsuandevolutionoftheSuJiaoorogenicbelt.RegionalGeologyofChina(inChinese),1999,18(2):162—174.
[4] 刘庆生,张泽明,刘勇胜.江苏东海地区ZK703钻孔榴辉岩的磁性结构及其深部地质意义.现代地质,1999,13(suppl.):45—50.LIUQingSheng,ZHANGZeMing.LIUYongSheng.MagneticStructuresofEclogitesfromZK703DrillHoleintheDonghaiRegion,EasternChina:Implicationsfordeepgeologicalprocesses.Geosciences(inChinese),1999,13(suppl.):45—50.
[5] 杨晓松,金振民,大陆科学钻探中岩石物理性质研究的意义.地学前缘,1998,5(4):338—346.YANGXiaoSong,JINZhenMin.Thesignificanceofthestudiesonpetrophysicalpropertymeasurementsincontinentalscien tificdrilling.EarthScienceFrontiers(inChinses),1998,5(4):338—346.
[6] YangWencai,ChenZhengyan,CrustalstructureanddevelopmentofDabieUHPMTerraneineast centralChina,ContinentalDynamics,1998,3(1-2):86—95.
[7] 杨文采,余长青.根据地球物理资料分析大别—苏鲁超高压变质带演化的运动学和动力学.地球物理学报,2001,44(3):346—359.YANGWenCai,YUChangChun,KeniticsanddynamicsofdevelopmentoftheDabieSuluUHPMTerraneongeophysicalevi dences.ChineseJ.Geophys.,2001,44(3):346—359.
[8] 姚长利,黎益仕,管志宁.重磁异常正反演可视化实时方法技术改进.现代地质,1998,12(1):115—122.YAOChangLi,LIYiShi,GUANZhiNing,Improvementofreal timevisualizedforwordandinversionofgravityandmagneticanomalies.Geosciences(inChinese),1998,12(1):115—122.
[9] HsuSK ,CoppensD ,ShyuCT .Depthtomagneticsourceusingthegeneralizedanalyticsignal.Geophysics,1998,63(6):1947—1957.
[10] 管志宁,姚长利.倾斜板体磁异常总梯度模反演方法.地球科学,1997,22(1):81—85.GUANZhiNing,YAOChangLi.Inversionofthetotalgradientmodulusofmagneticanomaliesduetodippingdike,Earthsci ences(inChinese),1997,22(1):81—85.
[11] FediM ,RapollaA .3Dinversionofgravityandmagneticdatawithdepthresolution.Geophysics,1999,64(2):452—460.
[12] CamachoAG ,MontesinosFG ,VieiraR .Gravityinversionbymeansofgrowingbodies.Geophysics,2000,65(1):95—101.
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