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2001年  12卷  第3期

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Rheological Strength of UHP Eclogite from Dabieshan: Evidences from High p~T Experiments
Zhang Junfeng, Jin Zhenmin, Green H W, Jin Shuyan
2001, 3(3).
摘要:
WepresenthereexperimentalstudyoftherheologicalpropertiesofUHPeclogitefromDabieatapressureof3GPabyutilizingthe5GPaGriggstypepistoncylinderapparatus.Therheologicalconstitutiveequationofeclogiteisdeterminedwithastressexponentof3.4,anactivationenergyof480kJ/molandapreexponentialfactorof103.3.Ourstudyshowsthat:(1)Asatypicaltwo~phaserock,theflowstrengthofeclogitedependsontheproportionsofthestrongphase(garnet)andtheweakphase(omphacite);(2)Theplasticdeformationofeclogiteisdominatedbydislocationcreep;(3)Basedonthateclogitehasthesamestrengthastheuppermantleharzburgite,ourstudysuggeststhatthedelaminationofthesubductingcrustcomponentfromtheunderlyinguppermantleisunlikely.Therefore,thestretchingafterthecollisionorogenycoupledwiththeupwellingoftheuppermantlemayplayamoreimportantroleintheexhumationofUHProcks.
On Geodynamic Evolution of Simao Region (Southwestern Yunnan, China) during Late Paleozoic and Triassic
Helmcke D, IngavatHelmcke R, Feng Qinglai, Wagner B, Heppe K
2001, 3(3).
摘要:
Overthelastyears,theSimaoregion,southwesternYunnan,China,turnedouttobeaverypromisingtargettoelucidateplate~tectonicprocessesaroundthePermian~TriassicboundarywithintheTethyandomainofAsia.NewdatafromthisarearevealthatUpperPaleozoiccompressionaldeformationsoccurredalongtheLancangjiangandinareastotheeast.AlongLancangjiang,anangularunconformityisexposed,whichseparatesquartz~phyllites—formedduringaCarboniferoustectonometamorphicevent—fromTriassicredbedstoroofingrhyolites.TheacidicvolcanicswereoftensaidtoberemnantsofavolcanicarcthatwasactiveduringtheTriassicsubductionandclosureofanoceanicrealmalongtheLancangjiangzone.Accordingtoournewdata,however,thesevolcanicsindicatemostprobablyanUpperTriassicstageofrifting.IntheYunxiananticline(NWofSimao),anangularunconformityofintra~PermianageisexposedwhereCarboniferoustolowerMiddlePermianstrata,whichweredepositedinaratherdeepbasin,areunconformablyoverlainbyashallowmarinesequenceofupperMiddletoUpperPermiansediments.Theangularunconformityisofthesameageasthesyn~orogenoussedimentsfirstdescribedanddatedfromthePhetchabunregioninThailandandhenceaconvincingargumentforaLateVariscanorogenyforminganextensivezoneofmountain~buildingthatcanbetracedthroughthecentralpartsofmainlandSoutheast~Asia.
Tracing Disrupted Outer Margin of Paleoeurasian Continent through Union of Myanmar
Myo Min, Khin Khin Lin, Feng Qinglai, Chongpan Chonglakmani, Dieter Meischner, et al.
2001, 3(3).
摘要:
Basedonstratigraphy,faciesdistributionandpaleontologyofupperPaleozoicandTriassicstratainMalaysia,Thailand,MyanmarandYunnan(China),thelocationofthedivisionbetweentheoutermarginofthedisruptedPaleoeurasiancontinentandpossibleGondwana~derivedterranesisdiscussed.Itisproposedthatthisdivisionislocatedmuchfurthertothewestthanthathasusuallybeenmaintained
Correlation of Tectono~Stratigraphic Units in Northern Thailand with Those of Western Yunnan (China)
Chongpan Chonglakmani, Feng Qinglai, Dieter Meischner, IngavatHelmcke Rucha, Helmcke Dietrich
2001, 3(3).
摘要:
Atentativecorrelationschemeforthetectono~stratigraphicunitsofNorthernThailandandthoseofWesternYunnan(China)isproposed.WepointoutthatacorrelationbetweentheChangning~Meng~lianbeltinWesternYunnanandtheNan~UttaraditzoneinNorthernThailand(oranda“crypticsuture”intheChiangRai~ChiangMairegion)isunlikely,foritwoulddemanda“suture”whichcutsacrossazonewithhigh~grademetamorphicsandgraniteintrusions(DoiInthanon~Lincangunit).Therefore,thenortherncontinuationoftheLampangregionissituatedintheSimaoregionofYunnan,asindicatedbyaverysimilardevelopmentduringPermianandTriassic(Lampang~Yunxianunit).TheNan~Uttaraditzoneisconsideredtobetheeasternmostpartofthisunit,anditsnortherncontinuationshouldbetraceableviaLuangPrabanginLaosintothesoutheasternpartsoftheSimaobasin.Here,however,outcropsofthisunithavenotyetbeenfound.ThesameisthecasewiththePhetchabununitwhichfollowstotheeast.BothunitsareprobablyhiddenunderathickcoverofMesozoicredbeds.Thewholeregionwascharacterizedbyahighlymobiletectonicdevelopmentwithalternatingphasesofcompressionalandextensionaldeformation.
Aragonite from Mulanshan Glaucophane Schist:Implications for Regional Evolution of Southwestern Dabie Mountains, Central China
Zhao Wenyu, Liu Rong, Wang Qinyan, Peng Changqi, Zhang Qingjie
2001, 3(3).
摘要:
Thearagonite,anindexmineralofglaucophaneschistfacies,hasnotbeenconfirmedintheDabieMountainshigh~pressureandultrahigh~pressuremetamorphicbelts.TheMulanshanglaucophaneschistinHuangpiCounty,HubeiProvinceislocatedinthesouthwesternDabieMountains,CentralChina.Themicron~sizedintergranulararagoniteisconfirmedwithopticalmicroscope(OM)andelectronprobemicroanalysis(EPMA)intheglaucophaneschist.Thesubmicrometer~sizedellipsearagoniteinclusionisobservedbyusingbright~fieldimage(BFI),X~rayenergy~damagespectrograph(EDS)andselectedareaelectrondiffraction(SAED)withtransmissionelectronmicroscopeinthequartzlensofglaucophane~albite~epidote~chloriteschistfromMulanshan.ThepresenceofaragoniteindicatesnotonlytheaveragegeothermalgradientoftheMulanshanglaucophaneschistlessthan10℃/km,whichisveryclosetothatofeclogiteintheDabieMountainsmetamorphicbelts,butalsotherelativelyhigherconcentrationofCO2duringthemetamorphicprocess.Inaddition,theglaucophaneschistfreeofsuchindexmineralsaslawsonite,prehniteandpumpellyite,hasbeenattributedtotheeffectofCO2onthestabilityofcalciumaluminumsilicatemineralsduringthelow~grademetamorphism.EDSandSAEDanalysisresultsshowthatthehostofaragoniteinclusionisamorphousSiO2.TheoccurrenceofamorphousSiO2indicatesaquickcoolingprocessduringtheexhumationoftheMulanshanglaucophaneschist.Theseresultssuggestthattherapidexhumationmechanismoftheglaucophaneschist,thesameasthatofeclogiteintheDabieMountainsmetamorphicbelts,occurredinthegeodynamiccontextofsubduction~obduction.
Trace Elements Analysis of Geological Samples by Laser Ablation Inductively Coupled Plasma Mass Spectrometry
Luo Yan, Liu Yongsheng, Hu Shenghong, Gao Shan, Lin Shoulin
2001, 3(3).
摘要:
Thispaperdescribesrecentworkapplyingalaserablationsystem(LSX~200)hyphenatedwithPOEMSⅢinductivelycoupledplasmamassspectrometry(LA~ICP~MS)fortheinsituanalysisof22traceelementsofsolidgeologicalmaterials.ItdemonstratesthepotentialofLA~ICP~MSforthedeterminationofgeochemicallyimportanttraceandultra~traceelementsfollowingXRFroutinesamplepreparation.Signaldrift,differenceintransportefficiencyandsamplingyieldarewellcorrectedwithNISTSRM612asexternalcalibrationstandardandCaasinternalstandard.Theobtainedresultsagreetotherecommendedvalueswithrelativeerrorbetterthan15%andRSDlessthan15%formostdeterminedtraceelements.LODrangesfrom0.021×10-6to0.23×10-6andlessthan0.10×10-6formajoritytraceelementsdetermined.Inaddition,home~mademacrofunctionsincludingfilterandcalculatorcompiledbyVBAlanguageunderExcelsoftwaregreatlyenhancedoff~linedatareductionefficiency.
Application of Stochastic Fracture Network with Numerical Fluid Flow Simulations to Groundwater Flow Modeling in Fractured Rocks
Wang Mingyu, Chen Jinsong, Wan Li
2001, 3(3).
摘要:
Thecontinuumapproachinfluidflowmodelingisgenerallyappliedtoporousgeologicalmedia,buthaslimitedapplicabilitytofracturedrocks.Withthepresenceofadiscretefracturenetworkrelativelysparselydistributedinthematrix,itmaybedifficultorerroneoustouseaporousmediumfluidflowmodelwithcontinuumassumptionstodescribethefluidflowinfracturedrocksatsmallorevenlargefieldscales.Adiscretefracturefluidflowapproachincorporatingastochasticfracturenetworkwithnumericalfluidflowsimulationscouldhavethecapabilityofcapturingfluidflowbehaviorssuchasinhomogeneityandanisotropywhilereflectingthechangesofhydraulicfeaturesatdifferentscales.Moreover,thisapproachcanbeimplementedtoestimatethesizeoftherepresentativeelementaryvolume(REV)inordertofindoutthescalesatwhichaporousmediumflowmodelcouldbeapplied,andthentodeterminethehydraulicconductivitytensorforfracturedrocks.Thefollowingtopicsarefocusedoninthisstudy:(a)conceptualdiscretefracturefluidflowmodelingincorporatingastochasticfracturenetworkwithnumericalflowsimulations;(b)estimationofREVandhydraulicconductivitytensorforfracturedrocksutilizingastochasticfracturenetworkwithnumericalfluidflowsimulations;(c)investigationoftheeffectoffractureorientationanddensityonthehydraulicconductivityandREVbyimplementingastochasticfracturenetworkwithnumericalfluidflowsimulations,and(d)fluidflowconceptualmodelsaccountingformajorandminorfracturesinthe2~Dor3~Dflowfieldsincorporatingastochasticfracturenetworkwithnumericalfluidflowsimulations.
Isotopic Stratification and Its Implications in Groundwater of Northern China
Chen Zongyu, Zhang Guanghui, Ni Zhenlong, Qi Jixiang, Nan Yunju
2001, 3(3).
摘要:
ThecontentsofD,8O,3Hand14C,distinctiveinshallowanddeepQuaternaryaquifersbeneathnorthernChina,reflectdifferencesinaveragepaleoclimaticconditionsbetweentheHoloceneandthelastglacialperiodinPleistocene.Groundwaterindeepconfinedaquiferwasrechargedduringthelastglacialperiod.Thedepletionsofδ(D)andδ(18O)ofthiswater,4×10-3~16×10-3and1×10-3~2×10-3whencomparedwiththeshallowwaterrechargedinHolocene,suggestthattheannualmeantemperaturewaslowerinthelastglacialperiodthanthatintheHolocene.ThecontinentalgradientofDand18OfoundinoldgroundwaterisessentiallysimilartothatinHolocene,suggestingthattheatmosphericcirculationdidnotundergosubstantialchangesovernorthernChinaforthepast30000yearsinspiteofthechangesinthetemperature.Groundwaterisotopicstratificationindicatesthreedifferentrechargemechanismsandtheinfluenceofmodernhydrologicalcirculation,whichareveryimportantfortheunderstandingofthecontinentalhydrologicalcirculationandthesustainabledevelopmentofgroundwaterresources.
Optimum Design of Highway Excavation Slope Angle: Evidence from Dawu Section of Jingzhu Highway
Hu Xinli, Tang Huiming
2001, 3(3).
摘要:
Theoptimumdesignofthehighwayexcavationslopeangleisoneofthemostimportantproblemstothehighwayconstructionandtotheslopeimprovement.TheDawuSectionofJingzhu(Beijing~Zhuhai)Highwayistakenasanexampletoillustratethestudymethodforexcavationslopeangledesign.TheanalysisoftheengineeringconditionfromdifferentangleswithdifferentfactorsshowsthatthestabilityoftheslopeiscalculatedbyusingresidualpushingforceandtheSarmamethod.Thenthesensitiveanalysisoftheslopestabilityisconductedbyusingresidualpushingforcemethod.Finally,theoptimumangleofdesignispresentedonthepreconditionofensuringthewholestabilityofslopeandtheeconomicreasonability.Thestudyresultsshowthatthemostsensitivefactorsaretheshearstrengthparameterandtheseismicforce,andthattheoptimumexcavationslopeangleis60°.
Cause Analysis of Wuhan Tianheng Building Pile Accident
Zhang Zhongxian, Xu Lin, Tang Jiaxiang
2001, 3(3).
摘要:
ThegeologicalconditionandtheoriginalstructurefeatureandfoundationdesignofWuhanTianhengbuildingaredescribed.Theaccidentappearanceofpilefoundationintheconstructionexecutionofworkisillustrated.Thegeneratingsourceofthispilefoundationaccidentisanalyzedingreatdetails.
Fractal Correction of Well Logging Curves
Li Qingmou, Cheng Qiuming
2001, 3(3).
摘要:
Itisalwayssignificantforassessingandevaluationofoilbearinglayers,especiallyforwellloggingdataprocessingandinterpretationofnonmarineoilbedstogetmoreaccuratephysicalpropertiesinthinandinter~thinlayers.Thispaperpresentsadefinitionofmeasuresandthemeasurepresentspowerlawrelationwiththecorrespondedscaledescribedbyfractaltheory.Thus,loggingcurvescanbereconstructedaccordingtothispowerlawrelation.Thismethodusesthelocalstructurenearbyconcurrentpointstocompensatetheaverageeffectofloggingprobesandmeasurementerrors.Asanexample,deepandmediuminducedconductivity(IMPHandIDPH)curvesinODPLeg127Hole797Carereconstructedorcorrected.Correctedcurvesarewithlessadjacenteffectsthroughcomparisonofcorrectedcurveswithoriginalone.Andalso,thepowerspectraofcorrectedwellloggingcurveareaboundingwithmoreresolutioncomponentsthantheoriginalone.Thus,fractalcorrectionmethodmakesthewellloggingmoreresolubleforthinbeds.
A High~Mathematical Model Optimizing Cuttings Transport in Oil Drilling Engineering
Ibrahim A A, Fadoul A M, Musa T A, Yao Aiguo
2001, 3(3).