简介:<正>1.MaterialcompositionofthegeosynclinaltectonicLayerThegeosynclinaltectoniclayerismainlycomposedofthefollowingtwoparts:sandyslaterocksofPrecambrinandvolcanicrocksinbededwithinthesand-slaterocks.Thesandy-slaterocksembracethechemicalcompositionalcharacteristicsoflightmetamorphicrocks:SiO2=54.5681.63(Wt%),withaverageof63.96(wt%)(n=58,thesameasfollowing);Al2O3=9.4717.75(wt%),withaverageof15.36(wt%),andAl2O3>K2O+Na2O+CaO;thecontentof(FeO+Fe2O3)variesgreatlywithFeO>Fe2O3;(CaO+MgO)=0.789.22(wt%)withaverageof23(wt%),andMgO>CaO;theratiosofK2O/Na2Orangfrom2to4(>1).Bycomparingallthischemicaldatawiththatoftheotherkindrocks,Wecanknowthatthesandy-slaterocksweretheeunicand/orbathyalsedimentswhichformedunderthestronglyactiveeugeosynclinaltectonicsetting.
简介:Tectonicoreformationisthercsultoftcctonicmovementincombinationwithore-formingmaterjalmovementintheprecessofcru8talevolutlonandtectonicdevelopmcnt.Oreformationjsconditionedbythelawgovcrningmobile-8tabletransformationincrustalcvolutionshowsanorderinmetallogenicevo-lution,regionaidistributionofgolddepo
简介:ThecontinentofChinaisgroupedintoPan-Cathaysianblocks,LaurasiaandGondwanaContinentalmarginsandrelicsofthreeoceans-Paleoasian,Tethys,andPacificasawhole.Indetail,thecontinentofChinagrewupbycoalescenceofthreeblocksorplatforms(NorthChina,TarimandYangtze)andeightorogenicbelts(Altay-InnerMongolia-Daxinganling,Tianshan-Junggar-Beishan,Qinling-Qilian-Kunlun,Qiangtang-Sanjiang,Gangdise,Himalaya,Cathaysia,EasternTaiwan)duringtheprocessesofoceaniccrustdisappearanceandacceretionary-collisionofcontinentalcrusts.Intheorogenicbelts,sixconvergentcrustalconsumptionzones(Ertix-XarMoron,SouthTianshan,Kuanping-Foziling,Bangongco-Shuanghu-Nujiang-Changning-Menglian,Yarlung-Tsangpo,Jiangshao-Chenzhou-Qinfang)havebeendistinguished.Correspondingly,thestrataofthecontinentofChinaaresubdividedinto17tectonicstratasuperregions,whichtectonicallybelongtothreeblocksorplatforms,sixconvergentcrustalconsumptionzonesandeightorogenicseries,respectively.Thisdivisionisbasedmainlyondifferencesoftectonicenvironmentandtectonicevolutionamongblocks,zonesandbelts,includingthetimingofwhentheoceaniccruststransferredintocontinentalcrusts,thepaleobiogeographicfeatures,andthetypesofstrata.
简介:About26sedimentarybasinsbearingoilandgasaredevelopedinChina.Theycanbeclassifiedintotwomaintypes,extensionalbasinsandforelandbasins.Theformerarechieflydistributedintheeasternpartandthelatterinthecentralandnorthwesternpartsofthecountry.Thepresentpaperdiscussesthestructuralcharacteristicsofthesebasins,includingsubsidencehistory,thermalhistoryandstructuralstyleandkinematics.Combinedwithtectonicsettinganalysisofgeophysicaldataanderuptiverocks,thegeodynamicsettingofthebasinsisestablished,andtheformationmechanismofthebasinsisdeducedtohavebeenrelatedtothesubductionoftheIzanagiandwestPacificplatesandtheclosingoftheTethysocean.
简介:TheearlyMesozoicgranodiorites(ca.165Ma)inthenortheasternHunanProvince(NEH)haveSiO2=65.4-69.65%,K2O/Na2O=0.95-1.38andK2O+Na2O>6%,A/CNK=0.96-1.13andbelongtometaluminoushigh-Kcalc-alkalineseries.TheyarecharacterizedbyLREEandLILEsenrichment,andHFSEdepletionwithslightlynegativeEuanomalies(Eu/Eu*=0.62-0.90).Theinitial87Sr/86Srratiosareinrangefrom0.711458to0.717461,andεNdvaluesvaryfrom-9.4to-12.3,distinctfromthoseofthecontemporaneousgranodioritesmantle-derivedfromtheSoutheasternHunanProvince(SEH)(87Sr/86Sr(i)=0.707962~0.710396,εNd(t)=-6.98~-2.30).Bycontrast,suchsignaturesareroughlysimilartothoseoftheneighboringotherMesozoicgraniticplutons(Eu/Eu*=0.30-0.70;87Sr/86Sr>0.710;εNd=-12to-16)inSouthChinaBlock(SCB),whichhavebeeninterpretedastheremeltingproductsofPrecambrianbasement.TheProterozoiclower-middlecrustisanimportantcontributortothepetrogenesisoftheseearlyMesozoicgranodioritesintheNEH.AnintracontinentalextensionsettingispresentinthenortheasternHunanProvinceatthattimeduetothedemandofenoughthermaltransfer.
简介:在这份报纸,用在云南和它的邻近的区域的中等强壮的地震的焦点的机制解决方案,并且基于焦点的机制解决方案的参数的统计分析,我们详细在云南区域讨论了地震差错类型和现代构造压力领域的特征。结果证明很中等强壮的地震发生在云南区域具有罢工--滑动类型,等于80%总数。指责的正常和有有罢工滑倒地震的罢工滑倒和颠倒和颠倒的正常在比例是几乎相等的,大约8%各个。云南区域的构造压力领域是在水平附近的,并且地震差错飞机的剧降大。有三主要动态来源,对一个人是的云南区域起作用从Myanmar,老挝和越南的NE,NNE和指导NNW的代理力量;第二是SE-SSE从四川和四川云南菱形块的指导力量并且第三是NW-NNW从华南块的指导力量。这三代理力量控制了主要差错的指责的行为和云南和它的邻近的区域的强烈地震活动的特征。
简介:Planarstructures(foliationsandfractures)aroundtheTombelgraben(southwesternendoftheCentralAfricanShearzonesystem)havebeeninvestigatedandanalyzedwiththeaimofunravelingthetectonicevolutionofthebasement.Thefoliationsshowtwomajortrends,anolderN-S-trendinggneissoselayeringofuncertainagereworkedbyalaterPan-African(600+50Ma)NE-SWductiletrendthatiscontemporaneouswithsinistralshearingandmylonitization.ThebrittlephasecharacterizedbyNW-SE-trendingopenandpartiallyfilledfracturesisyoungerthanthemylonitizationeventandalthoughithasnotbeendated,itissuggestedthattheoriginofthesefracturesislinkedtotheonsetofvolcanismalongtheCameroonvolcanicline-31m.y.ago.ThemyloniticfoliationisrecognizedforthefirsttimeandsupportsatectonicevolutionmodelfortheTombelgrabeninwhichductilenon-coaxialdeformationwassucceededbybrittlefailure.
简介:TheChinesemainlandisdividedintosometectonicblocksbynearlyNE-andEW-orientatedfaults.MeanwhilestrongearthquakesintheChinesemainlandusuallyclusterintimeandspace.Wecall2earthquakesingroups2.TectonicblocksseparatedbyfaultsandearthquakesingroupsareprominentfeaturesofthetectonicsoftheChi-nesemainland.Correlationbetweenmovementoftectonicblocksandgroupsofearthquakesisdiscussedinthispaper.Theresultsshowthatearthquakesingroupsoftenoccurredatoneorseveralblockboundaryfaults.Thereleasedelasticstrainenergyisbuiltupinthesameperiodsandaroundblocks.Itmeansthatstrongearthquakesingroupsaremainlycausedbymovementofblocks.Fourtypesofblockmovementareidentifiedbasedongroupearthquakes:movementalongasingleboundaryofablock(oracombinedblocks),movementofasingleblock,movementofmulti-blocks,andmovementinblockinteriors.IfweconsiderdistributionofallstrongearthquakesoccurredintheChinesemainland,themovementalongasingleboundaryofablockismorepopularoneinducingstrongearthquakes.Butifweonlyconsiderearthquakesingroupsratherthansingleearthquakesthemovementofablockdominatesamongfourmodes.StatisticswithrespecttogroupearthquakesshowthattheTaihangshanmountainandtheNorthChinablockaremuchactiveintheeasternpartofChinesemainland,andinwesternpartofChinesemainlandtheactiveblocksareSichuan-YunnanandtheKunlun-Songpanones.
简介:
简介:ThenorthernmarginoftheAlxablockisthejunctionofatectonicunits.Fourfirst-ordertectonicunitsaredistinguished:1.theYaganstructuralzonecharacteristicofanimmatureislandarc;2.theZhusileng-Hangwulastructuralzone,whichwasapassivecontinentalmarginintheEarlyPalaeozoicandwastransformedintoanactivecontinentalmarginintheLatePalaeozoic;3.theShalazhastructuralzonecharacteristicofamatureislandarc;4.theNuru-Langshanstructuralzone,whichwasaProterozoicorogenicbeltandlaterevolvedintoanextensionaltranstionalcrustinthePalaeozoic.Theabove-mentionedtectonicunitsdifferremarkablyinsedimentaryformations,magmaticrockassociations,metamorphismandgeochemistryandareboundedbyfaultsbetweenoneanother.
简介:INTRODUCTIONThepaleocontinentalmargins,characterizedbyactivein-teractionbetweenearthcrustandmantle,complicatedtecton-icmoveme...
简介:Themultiple-beddedcharacteristicsofthecrustandmultiple-stagenature(geosyncline-platform-diwa)ofthetectoicevolutionarctectonicprcrequisitcsfortheformationandevolutionofthegranitoidsandthcirtungstenmineralizationinJiangxi.ControlledbythemultiPlc-stagetectonicevolution,allthegranitoidsofdiffcrcntgeo1og
简介:Wanan盆的延期和沉淀上的量的研究被执行基于可得到地震并且和地区性的地质的数据的地上凿穿数据。用平衡剖面图和backstripping技术,我们重建了stratigraphic免职和盆的构造进化历史。形成从的盆始新世并且除了晚中新世的本地人通常处于一个extensional/transtensional国家compressoin。在渐新世并且早的主要的盆延期ocurred中新世(在∼16.3妈前)并且处于更小的率的此后一致的段。北、中间的盆在38.6-23.3妈期间更早强烈地延长了,当南部的盆主要在23.3-16.3妈期间被拉长时。盆形成和发展与轮流出现有关对沿着Wanan差错地区的右罢工滑倒运动左首。主导的动力学可以被华南海传播的seafloor引起并且它的外部板相互作用。盆构造进化被划分成五个阶段:起始的rifting,主要rifting,裂缝飘移转变,结构的倒置,和热沉淀。
简介:Thepaperpresentsanoverviewoftherelationshipsbetweentheinteriorstructuresoftectonicterranesandthedistributionoftectonic-metallogeniczonesinSoutheastAsia.Episodictectonicactivitiesoccurredinthisarchipelagicarea,generatingmetallogenicbeltsinmulti-terranes.SincetheLatePaleozoic,openingandclosureofthePaleotethysandNeotethysledtomultiplesuturezonesbetweendifferentblocks,mainlybetweentheIndochinaterrane,theNambungterrane,theSibumasuterraneandtheWestMyanmarterrane.DuringtheMesozoictoCenozoic,theformationofaccretedterranesandtheirrelatedislandswascausedbysubductionandcollisionprocessesbetweenthePacificandAustralianplatestowardtheEurasianContinent,formingSundalandanditsaffiliatedislands,thePhilippinesanditssubsidiaryislands,thePapuaNewGuineaterraneanditsrelatedislandsandtheSundaepicontinentalarcsystem.Withinthemarginofterranesresultedinthestructuraltransferzones,theirsecondarytectonicunitscanbedividedintoislandarcbelts,back-arcbasins,suturezones,marginalfoldbeltsandorogenicbelts.Themetallogenicassemblagesaremainlydistributedwithinthesestructuralzonesoftheterranes.Accordingtotherelationshipbetweenthesetectonicunitsandthedistributionofmineralresources,thetectonic-metallogenicbeltscanbedividedinto24metallogenicbeltsinSoutheastAsia.Theyarecharacterizedbyadiversityandfrequencyofmetallogenicmaterialcombinationwhichislikelytoreflectthecomplexityofthematerialdistributionduringmineralizationprocesses,mostlybythestructuraltransformationduringthedissociation-convergenceprocessbetweenmultipleterranes.Therefore,theformationoforedepositswasnotonlyrestrictedbytheevolution(openingandclosure)ofPaleo-andNeotethys,butmayalsobecontrolledbytheinteractionoftheterraneswithdifferenttectonicattributeswhichprovidedmultiplesourcesofmetallogenicmaterial.
简介:<正>ONSOUTHERNSTRETCHOPTHES-NTECTONICBELT,CHINAChenGuanghaoandWeiZhoulin(ChangshaInstituteofGeotectonic,AcademiaSinica,Changsha,410013,Hunan,China)S-Ntectonicbelt,southstretching,boundingbeltItcanbeinferredfromthegeophysicaldata,linearstructures,tectonicevolu-tionhistoryandmetallogenythattheS-NtectonicBeltstretchesfurthersouthinadifferentdi-rectionandmannerafterinterceptedbytheRedRiverFault,Thestretchingsegmentistheim-portanttectonicboundaryinIndo-AsiaandassiminlatestheS-Ntectonicbeltwithsomediffer-ences.
简介:Dulaerqiao花岗石在在Erguna山岳和Xingan山岳之间的Xinlin-Xiguitu-Toudaoqiao缝术地区被定位,内部蒙古的东北。岩石主要由K长石,石英,和斜长石组成。这花岗石在晚含碳的时期被扔的锆石LA-ICP-MSU-Pb数据表演(308.7条獥?