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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).
摘要:
With special drilling operation equipment and specific conditions of geology, how does drilling fluid carry cuttings effectively? So far, it is still an urgent problem for drilling researchers to study. This work just aims at the actual engineering background to develop studying model. In this paper, according to non~Newtonian fluid mechanics, the law of the solid~liquid, two~phase fluid flow and actual drilling engineering, the major factors affecting cuttings transport are drilling fluid velocity, hole inclination and fluid rheological properties. Getting a clear understanding of the law of drilling fluid and its cutting taking mechanism, this paper puts forward a model for analysis of field data and quantitative forecast of cutting taking capability of drilling fluid. The full~scale annular test section was 6.1 m with 76 and 114 mm drillpipe in a 203 mm ID (wellbore diameter). Hole angle varied from 0°to 90°.