简介：<正>1IntroductionTheundergroundbrineresourcesdistributingwidelyinSichuanBasin,Chinahavedrawnworldwideattentionduetotheirunusualelementabundanceandexcellentquality.

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

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简介：新疆哈密东天山构造岩浆带位于尾亚-罗布庄磁力高带上的喀拉塔格磁场小区,该带发育幅值在200~300nT的正磁场区,封闭磁异常对应于石炭纪石英闪长岩或隐伏基性侵入岩体。钳子山C07-2磁异常为该区带高磁异常,最高幅值2340nT。经钻探验证,打出3层低品位含铜钛磁铁矿,总厚119m。据81个化学样分析,TFe约3.6%~28.80%,平均品位13.5%,TiO21.31%~2.33%。ZK0701-10/5层(111~113m)见有2m厚具工业品位的铜矿体和磁铁矿体,分析结果为Cu0.4%,TFe28.8%。该钻探成果为在哈密玉西地区寻找岩浆型钛磁铁矿提供了有力依据。

简介：Thevolcano-sedimentarysuccessionaroundWadiZaghrainSinai,atthenorthernmostsegmentoftheArabianNubianShield,comprisesvolcanicrocksinterbeddedwithratherimmaturesediments.Thesuccessionisdominatedbyintermediatetosilicicvolcanicsofmedium-tohigh-Kcalc-alkalineaffinity.Itisdividedintotwounits,thelowerunitincludesintermediaterocksanddacitesinterbeddedwithgraywackes,semi-pelitesandpelitesandtoppedbypolymictconglomerates.Thisunitissubjectedtofoldingandregionalmetamorphism(uptogarnetzone)andisintrudedbyquartzdiorite-granodioriteinducing,locally,low-pressurecontactthermalmetamorphism.Theunmetamorphosedupperunitencompassesacidvolcanicsintercalatedwithlitharenite,sublithareniteandminorarenite.Therhyolitesofthisunitpertaintothehighlyfractionatedgranitesandarecharacterizedbyanagpaiticindex(NK/A)rangingfrom0.87to0.96.Theymayreflecteitherextensiveinteractionofsubduction-relatedmagmaswiththecontinentalcrustorachangeinthetectonicregime.Thepresentlithologicalandgeochemicalcharacteristicsofthestudiedsedimentstogetherwithavailablezirconagesindicateratherdistalprovenanceoftheirdetritus.Thisdetrituscomprisesfluvial-alluvialsedimentsaccumulatedintheintermontanebasins,whicharehalf-grabensortiltedfaultblocks.Thetectonicsettingofthedepositionalbasinsisactivecontinentalmarginandcontinentalislandarcs.GeochemicalpatternsoftheZaghravolcano-sedimentarysuccessionindicatetheircorrelationwiththeDokhanVolcanics-HammamatClasticssequenceoftheEasternDesertofEgypt.Also,theZaghravolcanicsdisplaygeochemicalsimilaritieswiththoseexposedinSinai,attheRutig,FeraniandIqnaShar’aareas.TheZaghrasuccessionisdatedasEdiacaranbutisnotrelatedeithertotheensimaticislandarcassemblageortotherift-relatedassemblageformedduringtheearlystagesofthebreak-upofRodiniaaspreviouslythought.

简介：AccordingtoVeningMeinesz-Moritz(VMM)globalinverseisostaticproblem,eithertheMohodensitycontrast(crust-mantledensitycontrast)ortheMohogeometrycanbeestimatedbysolvinganon-linearFredholmintegralequationofthefirstkind.HeresolutionstothetwoMohoparametersarepresentedbycombiningtheglobalgeopotentialmodel(GOCO-03S),topography(DTM2006)andaseismiccrustmodel,thelatterbeingtherecentdigitalglobalcrustalmodel(CRUST1.0)witharesolutionof1o×1o.ThenumericalresultsshowthattheestimatedMohodensitycontrastvariesfrom21to637kg/m3,withaglobalaverageof321kg/m3,andtheestimatedMohodepthvariesfrom6to86kmwithaglobalaverageof24km.ComparingtheMohodensitycontrastsestimatedusingourleastsquaresmethodandthosederivedbytheCRUST1.0,CRUST2.0,andPREMmodelsshowsthatourestimateagreesfairlywellwithCRUST1.0modelandratherpoorwithothermodels.TheestimatedMohodepthsbyourleast-squaresmethodandtheCRUST1.0modelagreeto4.8kminRMSandwiththeGEMMA1.0basedmodelto6.3km.

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简介：欧洲建成32家世界地质公园,中国建成20家世界地质公园,地质公园建设已经成为世界关注的热点。第1届世界地质公园大会在北京召开,第2届世界地质公园大会在英国北爱尔兰的贝尔法斯特召开,第3届世界地质公园大会于2008年6月22～26日在德国的奥斯纳布吕克市召开。

简介：由露头，日志和核心数据识别古老的河的词法类型是容易的。然而，隧道的水平分发和几何学能被依靠3-D仅仅鉴别并且预言地震数据。特别，地震地平线切的3-D能在蜿蜒地流的河，支流隧道和低蜿蜒的隧道的沙岩预言起一个重要作用。每个微外形单位包括主要隧道，例如蜿蜒或分叉的隧道，早朝，裂缝隧道，叶舌裂缝展开，泛滥平原等等能被识别。编织隧道沙岩是平面平坦侧面连接沙身体和厚主要隧道带的分发能仅仅从3-D被识别地震数据。因为编织沙岩是无所不在的，他们的出现和分发不需要被预言。通常，煤速度是那么低的它能在煤阶层创造强壮的振幅思考。它因而隐藏振幅作答到吻合能从3-D被识别的隧道沙岩地震倒置数据有时。充满泥的低蜿蜒的河的案例研究与3-D识别了地震数据显示如此的沙身体的规模和width-to-thickness比率是小的，旁边地不连接，并且通常在干燥气候条件下面发生在一把冲积扇子的远或进一步的部分上。有时，沿着地平线的每个思考事件的地震属性的抽取被期望最大化古老的隧道的空间进化的表示。

简介：基于滑坡参数取值对滑坡稳定性评价影响重大，本文运用各种方法对岩土力学参数指标c、φ取值问题开展研究。研究结果表明，综合运用多种方法，可以达到合理选择岩土的力学参数c、φ值的目的，避免人为降低设计参数、增大工程投资或c、φ取值偏高给工程安全带来隐患的问题。

简介：The2ndMid-EuropeanClayConference(MECC'04)washeldbetween20-24thSeptember2004,inMiskolc,Hungary.Theideatoholdcommonconferenceswasacceptedbythenationalclaygroupsoffourneighbouringcountries,Poland,Slovakia,HungaryandCroatia,duringtheEUROCLAYMeetinginCracow,Poland,in1999.Thefirstconferencewasheldin2001atStaráLesná,intheHighTatraMts.inSlovakia.

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：塔河油田C区位于油田西部,主要储、产油气层为下奥陶统,属于潜山碳酸盐岩储层类型,以构造溶蚀孔、洞、缝等次生孔隙为主的储集空间,使其成为具有双重或多重孔隙介质的特殊储层,非均质性明显.

简介：本刊讯（李亚楠）河北省张家口市国土资源局积极组织申报下花园矿山地质环境治理项目,获得国务院审批。日前,该项目3亿元专项治理资金,已到位1亿元,近期即可开工建设。近年来,为加快我国重点区域矿山地质环境治理,财政部、国土资源部计划用3年时间,重点支持资源枯竭城市的矿山地质环境治理。

简介：The3^rdInternationalConferenceonContinentalEarthquakes,Mechanism,Prediction,EmergencyManagement&Insurance(the3^rdICCE)washeldonJuly9-14,2004inBeijing,China.TheICCEhasbeenheldeverydecadesinceitwaslaunchedovertwentyyearsago.ThefirstICCE,withthetitle""""InternationalSymposiumonContinentalSeismicityandEarthquakePrediction""""(ISCSEP),hadinternationalsponsorshipandwassupportedbye.g.,UNESCOandhostedbytheSeismologicalSocietyofChina(SSC)inBeijingin1982.In1992inresponsetotheinitiativesfromtheUN'sInternationalDecadeforNaturalDisasterReduction(IDNDR),

简介：若拉岗日裂谷带位于拉竹龙-西金乌兰-金沙江结合带的中段，该带作为一条重要的大地构造分界线已被地学界所注目．在西金乌兰地区发现了蛇绿混杂岩带，在金沙江、甘孜理塘等地保留有较完整的洋壳残片（蛇绿混杂岩套）和岛弧火山岩建造，其西延的若拉岗日一带，没有见到这些地质体．基性岩（脉）和少量超基性岩脉是三叠纪热侵位的产物，地球化学等特征表明。它们不是MORB型基性岩，更多地体现板内裂谷特征：石炭系-下二叠统基性火山岩以碱性系列玄武岩为主，具裂谷型双峰式特征。岩石地球化学等特征表明，它们形成于板内或板内裂谷；酸性花岗岩类侵入岩极不发育，构造岩浆带不发育．