简介：<正>REPLACEMENTPATTERNSOFGEOTECTONICUNITSLiYuping(Dept.ofChemicalScienceandEngineering,HunanUniv.,Changsha,China,410082)replacementpattern,geotectonicunit,DiwatheoryBaseupontheDiwatheoryandthestudiesofevolutionprocessofgeotectonicunits,thispaperhasadvancedthattherearemanyreplacementpatternsofthegeotectonicu-nitsintheirevolutionprocess.Therearethreereplacementpatterns(eg.suddenchange(nor-mal)pattern,gradualchangeandprogressivepattern)duringtheplatformregionsubstitutesthegeosynclinalregionandthreereplacementpatterns(eg.normalpattern,surpassivepatternandprogressivepattern)whentheDiwaregiondevelopsfrompre-Diwaregions.Theknowl-edgeoftheseregularityisofimportantsignificanceforustodeeplystudytheevolutionofgeo-tectonicunitandthedevelopmentofthecrust.

简介：ThenorthernmarginoftheAlxablockisthejunctionofatectonicunits.Fourfirst-ordertectonicunitsaredistinguished:1.theYaganstructuralzonecharacteristicofanimmatureislandarc;2.theZhusileng-Hangwulastructuralzone,whichwasapassivecontinentalmarginintheEarlyPalaeozoicandwastransformedintoanactivecontinentalmarginintheLatePalaeozoic;3.theShalazhastructuralzonecharacteristicofamatureislandarc;4.theNuru-Langshanstructuralzone,whichwasaProterozoicorogenicbeltandlaterevolvedintoanextensionaltranstionalcrustinthePalaeozoic.Theabove-mentionedtectonicunitsdifferremarkablyinsedimentaryformations,magmaticrockassociations,metamorphismandgeochemistryandareboundedbyfaultsbetweenoneanother.

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简介：Inthelate19thandtheearly20thcentury,withexpandingindustrialismandurbanisation,theideaofthenationstategrewstronginSweden.Inthisnationalisticenvironment,natureandthenaturalsciencesassumedanimportantunifyingrole.Thesearchfornaturalresourcesandsourcesofenergyinspiredpoliticalsupportandresearch.Theexploitationofnaturewaslookeduponasaprerequisiteforthemodernizationofthecountry,andindeedwastobecomethebasisforSweden'swelfare.Itwasunderthesecircumstancesthat,in1906,the11thIGCwasinvitedtoStockholmin1910.ArequestforaGovernmentgrantfocusedontheinternationaldevelopmentofsciencebutalsostressedthenationalimportance.Swedenhad,itwassaid,itsrankingpositionamongnationstodefend,toupholditspositionamongcivilizednations,andtomaintainitsdistinguishedtraditioninthespheresofnaturalsciencesandminingoperations.ThemaintopicsoftheCongresswereironoreresources,post-glacialclimatechange,glacialerosion,theCambrianfauna,geologyofthePrecambrian,andgeologyofthepolarregions.Threeexhibitionsand24excursionswerearranged,and41guidebooksprinted.Thenumberofmemberspresentwas625,from37countriesandsixcontinents.Thefinalcostforarrangingthe11thIGCwasSEK125,000(approximately∈540,000today).AnovelexperienceinthetraditionoftheIGCswastheworld-wideinquiriesabouttheresourcesofironoreandaboutclimatechange.Suchthematic,worldwideinvestigationssubsequentlycametoattracttheattentionofmanyIGCs.ApropositiontoestablishacommissionforthepublicationofaninternationalstratigraphicdictionarywasapprovedbytheCongress,andasubcommissionwassetupwithcommissionersfromtencountries,butitwasnotuntil1956thatthefirstvolumesofLexiqueStratigraphiqueInternationalappeared.FromaSwedishpointofview,theCongresscompelledSwedishgeologiststocarryoutaninventoryoftheresultsofSwedishgeologicalr

简介：淮南矿务局潘三矿自建井以来共发生十多次煤及瓦斯突出，给煤矿生产造成严重危害，通过对典型实例的描述、结合矿井地质资料的分析，认为媒矿及瓦斯突出与矿区的地质构造带有直接的关系，且分布范围局限，建议对地质构造应力较为集中的地带进行监控、分析、预测。

简介：ＴｈｅＣｅｎｔｒａｌＭｏｕｎｔａｉｎＲａｎｇｅｓｏｆＣｈｉｎａ，ｗｈｉｃｈｏｃｕｐｙｔｈｅｃｅｎｔｒａｌｐａｒｔｏｆＣｈｉｎａ，ｃｏｍｐｒｉｓｅｍａｉｎｌｙｔｈｅＤａｂｉｅＭｏｕｎ－ｔａｉｎｓｉｎｔｈｅｅａｓｔ，ｔｈｅＱｉｎｌｉｎｇＭｏｕｎｔａｉｎｓ...

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简介：TightzonesofthegasbearingKanganandDalanformationsoftheSouthParsgasfieldcontainaconsiderableamountofunsweptgasduetotheirlowporosity,lowpermeabilityandisolatedporetypes.Thecurrentstudy,integratescoredata,rockelasticpropertiesand3Dseismicattributestodelineatetightandlow-reservoir-qualityzonesoftheSouthParsgasfield.Inthefirststep,thedynamicreservoirgeomechanicalparameterswerecalculatedbasedonempiricalrelationshipsfromwelllogdata.Thelog-derivedelasticmoduliwerevalidatedwiththeavailablelaboratorymeasurementsofcoredata.CrossplotsbetweenestimatedporosityandelasticparametersbasedonYoung'smodulusindicatethatlowporosityzonecoincidewithhighvaluesofYoung'smodule.Theresultswerevalidatedwithpetrographicstudiesoftheavailablethinsections.Thecoresampleswithlowporosityandpermeabilityarecorrelatedwithstrongrockswithtightmatrixframeworksandhighelasticvalues.Subsequently,rockelasticpropertiesincludingYoung'smodulusandPoisson'sratioalongwithporositywereestimatedbyusingneuralnetworksfromacollectionof3Dpost-stackseismicattributes,suchasacousticimpedance(AI),instantaneousphaseofAIandapparentpolarity.Distinguishinglowreservoirqualityareasinpayzoneswithunsweptgasisthenfacilitatedbylocatinglowporosityandhighelasticmodulusvalues.Anhydritezonesareidentifiedandeliminatedasnon-payzonesduetotheircharacterizationofzeroporosityandhighYoungmodulusvalues.Themethodologydescribedhasapplicationsforunconventionalreservoirsmoregenerally,becauseitisabletodistinguishlowporosityandpermeabilityzonesthatarepotentiallyproductivefromthoseunprospectivezoneswithnegligiblereservoirquality.

简介：KarstrocksfromtheHuanglongFormationexposedatthemarginoftheEasternSichuanBasincanbedividedintofourtypes:slightlycorroded,moderatelycorrodedporous,intenselycorrodedbrecciatedandintenselycorrodedandreplacedsecondarycalcickarsticrocks.Thecarbon,oxygenandstrontiumisotopecompositionsofthevariouskarstrocksareanalyzedsystematicallyandcomparedtorockswithoutkarstcorrosion.Theresultsindicatethat(1)theHuanglongFormationintheeasternSichuanBasinwasarestrictedbaysuppliedandcontrolledbyfreshwaterinwhichmudmicriteandmud-dolomicriteexhibitlowδ13Candδ18Ovaluesandhigh87Sr/86Srratios;(2)alltypesofkarsticrocksinthepaleokarstreservoirsoftheHuanglongFormationintheresearchareaareaffectedbyatmosphericfreshwaterwiththeδ13Candδ18Ovaluesand87Sr/86Srratiosintheoriginalformationapproachingthoseofatmosphericfreshwater,whichreflectsancienthydrologicalconditions,fluidproperties,isotopicsourceandthefractionationeffect;(3)theintenselycorrodedandreplacedsecondarylimestoneisaffectedbyavarietyofdiageneticfluids,oftenreflectedbyδ13Candδ18Ovalues,whilethe87Sr/86Srratiosexhibitthestrongdegreeofthecorrosion;(4)aftercomparingthe87Sr/86Srratiosofeachtypeofkarstrock,thediageneticfluidsaredeterminedtobemainlyatmosphericfreshwater,anddependingonthestrengthofcorrosion,andthelow87Sr/86Srratiofluidsinthelayerwillparticipateinthekarstprocess.Thecarbon,oxygen,andstrontiumisotopesofdifferentkarsticreservoirscanprovidemeaningfulgeochemicalinformationforforecastingandevaluatingthedevelopmentanddistributionrulesoftheHuanglongFormationatthemarginoftheeasternSichuanBasinintimeandspace.更多还原

简介：在华南的Dajiangbian形成是统治siliciclastic的沉积继任，低档变态在卡赛西亚·布洛克的西方的边缘上扔了，并且被glaciogenicdiamictite(Sizhoushan形成)盖住。Sizhoushanglaciogenic阶层能被归因于Jiangkou冰川(Sturtian冰川)他们在华南与Jiangkou阶层分享stratigraphic和lithological类似的事件。在整个Dajiangbian形成的上面的部分的一些碳酸盐，燧石和页岩单位为碳酸盐碳同位素被取样(13Ccarb)和器官的碳同位素(13Corg)分析。geochemical的一个范围索引包括氧同位素(18O)并且Mn/Sr(Fe/Sr)比率建议主要的碳同位素价值在上面的Dajiangbian形成被保存。上面的Dajiangbian形成表演13C向上减少向的-0.1,的carb到-5.4。我们建议否定13在Sizhoushandiamictite下面的C旅行是有Pre-SturtianIslay13Ccarb异例并且与全球Neoproterozoic同位素地层学允许关联。我们发现碳酸盐和上面的Dajiangbian形成的器官的碳同位素数据被联合，与13Ccarb-13C在多重大陆上观察的org模式。

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简介：4月13日，记者从通过评审的《北京规划新城前期区域工程地质勘查评价报告》中获悉，北京市11个规划新城的工程地质条件及场地稳定性较好，适宜于场地建设。中国科学院院士李廷栋等专家认为，项目成果总体达到国际领先水平，不仅为北京市建成现代化、国际化大城市提供了重要地质依据，而且对全国其他大城市建设及城市地质工作也具有重要借鉴价值。

简介：本报讯近日，地震预警四川省重点实验室传出消息，首都圈地震预警系统经过近一年半的建设，目前已建成并投入运行，将为首都圈民众和地铁、化工等重大工程提供地震预警服务。

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