简介：<正>Nowtheminingofhighsaltundergroundbrinehasbeenanimportantaspectofsaltlakemining,whichisthenecessarysupporttothedevelopmentofnationaleconomy.Withthechangeofundergroundgeological

简介：Inthepasttwentyyears,theproportionofcoalinprimary-energyconsumptioninChinaisgenerallybetween71.3%and76.5%.Theoutputofcoalwas1.374billiontonsin19%,and1.21tonsin1998,whichrankedfirstintheworld.NowcoalisminedmainlywithmechanizationinChina,whichisplannedtoreach80%inmajorState-ownedcoalminesin2000accordingtotheplanningofthegovernment(Lietal.,1998;TangDejin,1998).ComparedwiththeUSAandAustralia,Chinahasmorecomplexcoalgeologicalstructures.Basedonhigh-resolutionseismictechniqueincoalexploration,anewseismictechniquewithhigh-precisionandhigh-resolution(2-Dand3-D)hasbeendevelopedforthepurposeofdetectingsmallgeologicalstructuresincoalmineconstructionandproductiontomeettheneedsoflarge-scalepopularizationofmechanizedcoalmininginChina.Thetechniqueislowincostandrequiresarelativelyshortperiodofexploration,withhighprecisionandwide-rangeapplications.Inthemiddleoft

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简介：Thestructuralpropertiesofjadeiteathighpressures(0.0001-30GPa)areinvestigatedusingplane-wavepseudopotentialdensityfunctionaltheorymethod.Asafunctionofpressure,themonocliniccellparameterswerecalculatedandthecompressibilitycoefficientsare0.0026,0.0023and0.0026GPa-1,respectively.Thebondlength,bondangleanddistortionvariationwerestudiedinordertoobtaintheinformationofpolyhedralcompression.Thepressure-volumeequationofstatewasconsideredinordertoobtainthebulkmodulusK0.ComparisonbetweenthecalculatedK0valuesandtheexperimentaldatasuggestedthatthemodelprovidesreasonableinsightsintocrystallographicandphysicalpropertiesofjadeite.

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简介：IfoundhighQvalues(Q-ratio=Jn/Ji,Jn,Jiareremanentmagnetizationandinducedmagnetization)intheSuluultrahighpressure(UHP)metamorphicrocks,easternChinawhichistheworld’slargestUHP

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简介：Naturalgascontaininghydrogensulphide(H2S)hasbeenfoundinseveralpetroliferousbasinsinChina,suchastheSichuanBasin,BohaiBayBasin,OrdosBasin,TarimBasin,etc.NaturalgaswithhigherH2Scontents(H2S＞5%mol.)ismostlydistributedinboththegasreservoirsofDukouhe,Luojiazhai,PuguangandTieshanpo,whichbelongtotheTriassicFeixianguanFormationinthenortheasternSichuanBasinandthoseoftheKongdian-ShahejieformationsinthenortheasternJinxianSagoftheJizhongDepression,BohaiBayBasin.IntheSichuanBasin,theH2Scontentsofnaturalgasaverageover9%andsomecanbe17%,whilethoseoftheBohaiBayBasinrangefrom40%to92%,beingthenoneofthegasreservoirswiththehighestH2Scontentsintheworld.Basedondetailedobservationandsampleanalysisresultsofatotal5000mofcorefromover70wellsintheabove-mentionedtwobasins,especiallysulfurisotopicanalysisofgypsum,brimstone,pyriteandnaturalgas,alsowithintegratedstudyofthegeochemicalcharacteristicsofhydrocarbons,itisthoughtthatthenaturalgaswithhighH2Scontentsresultedfromthermochemicalsulfatereduction(TSR)reactions.Amongthem,thenaturalgasintheFeixianguanFormationresultedfromTSRreactionsparticipatedbyhydrocarbongas,whilethatintheZhaolanzhuangoftheJinxianSagbeingtheproductofTSRparticipatedbycrudeoil.DuringtheconsumptionprocessofhydrocarbonsduetoTSR,theheavyhydrocarbonswereapttoreactwithsulfate,whichaccordinglyresultedinthedrycoefficientofnaturalgasincreasingandthecarbonisotopesbecomingheavier.

简介：Thepetrologicalresearchontheultra-highpressuremetamorphism(UHP)ofcollisionalorogenindicatesthattheupper-crustalrocksissubductedtodepthsexceeding100km,andreturnedtothesurfacerapidly.Inthisstudy,weinvestigatethethermalstructureofcollisionalorogenasaslabofcontinentallithospherebeingsubductedbeneathanoverridingwedgeofcontinentallithospherebythe2-Dfiniteelementmethod.Theadvectionheattransferduetotheaccretionoforogenicwedgeisconsidered.

简介：HighcutslopeshavebeenwidelyformedduetoexcavationactivitiesduringtheperiodofimmigrantrelocationinthereservoirareaoftheThreeGorges,China.Effectivereinforcementmeas-uresmustbetakentoguaranteethestabilityoftheslopesandthesafetyofresidents.Thisarticlepre-sentsacomprehensivemethodforintegratingparticleswarmoptimization(PSO)andsupportvectormachines(SVMs),combinedwithnumericalanalysis,tohandlethedeterminationofappropriaterein-forcementparameters,whichguaranteebothslopestabilityandlowerconstructioncosts.Therelation-shipbetweenreinforcementparametersandslopefactorofsafety(FOS)andconstructioncostsisin-vestigatedbynumericalanalysisandSVMs,PSOisadoptedtodeterminethebestSVMperformanceresultinginthelowestconstructioncostsforagivenFOS.Thismethodologyisdemonstratedbyaprac-ticalreservoirhighcutslopestabilisedwithanti-slidingpiles,whichislocatedattheXingshan(兴山)CountyofHubei(湖北)Province,China.Thedeterminationprocessofreinforcementparametersisdiscussedprofoundly,andthepilespacing,length,andsectiondimensionareobtained.Theresultspro-videasatisfactoryreinforcementdesign,makingitpossibleasignficantreductioninconstructioncosts.

简介：同位素在在地球科学跟踪并且标明日期起一个重要作用，特别87Rb-86Sr系统。与地球科学的发展，整个岩石的分析斜面足够地满足要求因为科学研究和微量分析变得越来越重要。激光脱离多收集者诱导地联合的血浆mass-spectrometry(LA-MC-ICP-MS)广泛地由于它的低样品消费在微地区的分析被使用了，高精确性在矩阵上的situ和低要求，但是当它被严重优秀辨别和集体光谱干扰的各种各样的类型限制，精确地与高Rb/Sr比率和低Sr内容特别为样品测量Sr同位素作文仍然是困难的。因而，热电离mass-spectrometry(提姆)分析同位素的比率的最精确、精确的方法，仍然是分析Sr比率的最流行的方法，特别为有低Sr内容的样品。这篇论文在low-Sr的高精确的Sr同位素分析上做系统的评论地质的样品包括微采样的技术，极端低的程序的空白的化学方法和提姆测量技术。极端低的程序的空白和提姆的联合能被用来与ng大小执行样品的高精确的微量分析，它将无疑是为Rb-Sr地球年代学，地球化学和环境研究的一个重要方向。

简介：Therearefourunitsofhigh-pressuretoultrahigh-pressuremetamorphismextendingfromsouthtonorthacrosstheTongbai-DabieMountains:theepidote-blueschist-faciesunit,thelow-temperatureeclogitefaciesunit,theultrahigh-pressureeclngitefaciesunitandthemedium-temperatureeclogitefaciesunit.ThelatertwounitswereformedduringtheCaledoniansubductionbetweentheTongbai-DabiemicroplateandtheNorthChinaplate,theformertwounitsaretheproductsofIndosiniancontinental-continentalsubductionandcollisionbetweentheYangtzeandtheNorthChinaplates.

简介：摘要：体积与在SuluUHP岩石上套印的Tan-LuHP糜棱岩porphyroclasticphengite，neoformedphengite和他们的混合物分开与40Ar/39Ar被分析步加热方法。从ultramylonite的neoformedphengite的二件样品给40Ar/39Ar209.9的高原年龄吗？

简介：Eclogiticgarnet-amphibolerocksarescatteredaroundtheSongshugouultramaficbodiesinQinlingMountains.Threemetamorphicstagesarerecognizedintermsofpetrography,mineralchemistryandgeothermobarometry.Thefirstalbite-amphibolestagewasofgreenschistfaciesmetamorphismwithtypicalmineralassemblageofactinolite+epidote+chlorite+albite;thepressureandtemperatureconditionswereequaltoorlowerthan500MPaandabout400℃.Thesecondprogradeeclogiticgarnet-amphibolestagewasofamphibole-eclogitefaciesmetamorphismwithtypicalmineralassemblageofgarnet+hornblende±clinopyroxene+rutilewithoutphagioclase,thepressureconditionwasatleast1000-1200MPaandthetemper-atureabout600℃.Thethirdretrogradeepidote-amphibolestagewasofepidote-amphibolitefacieswithassemblageofplagoclase+hornblende+epidote+ilmenite/titanite,thetemperaturewas500-600℃andthepressurefrom800MPadownto500MPa.AllthreestagestookplaceinonesingletectonothermaleventcalledJimingianmovementa

简介：摘要：在这份报纸，试验性的研究被进行以便从高氧化铝的苍蝇灰直接测试sintering多铝红柱石的可行性，没有增加任何额外的材料。结果证明在大多数sintered样品的多铝红柱石内容是超过70%。从beneficiated苍蝇灰的样品sintered在一样的合成条件下面从同样收到的苍蝇灰比那些有多铝红柱石的一个更高的内容。为了获得一个平等者，多铝红柱石总计，更高的sintering温度比为同样收到的苍蝇灰为beneficiated苍蝇灰被需要。就sintered多铝红柱石的物理性质而言，有利sintering温度是1400

简介：Thetimesequenceofhigh-resolutionpaleoclimaticchangessincethelastglacialperiod--60,500yrB.P.--hasbeenreconstructedwithhigh-precisionTIMS-UseriesdatesandanalysesoftheoxygenisotopesfromQ4andQ6stalagmitesoftheQixinCaveinsouthernGuizhou.Comparativeanalysesofδ^18OcurvesfromtheGISP2'icecoreandthetwostalagmitesshowsthatthedepositionalrecordsoftheDansgaard-Oeschgercycleevents1-18andHeinrich'seventsH1-H5fromtherecordsofthetwostalagmitesreflectrapidclimatechangesoverashorttimescalesincethelastglacialstage,andindicatesthepreciseboundarylinesatwhichthecoldeventsoccurred.Thestudyresultshaveshownthattherecordsofthecoldandwarmeventsfromthetwostalagmitessince60,500yrB.P.arethereflectionofthepaleo-monsooncirculation.ChangesareclearlyaffectedbytheclimateoscillationoftheNorthAtlanticOcean,andindicatethattheyhaveastrongteleconnectionwiththepaleoclimatechangesthatoccurredintheNorthPolarregion.Therecordsofδ^18OfromtheQ4andQ6stalagmitesindicatethattheδ^18Ovaluesfrom60,590yrB.P.to11,290yrB.P.changedfromamorenegative(orlighter)drifttoaheavierorpositivedrifttrendinthelastglacialperiod.ThedatareflecttheweakeningoftheAsiansummermonsoonandtheclimatewhichgenerallybecamedrierandcooler.

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简介：在Quanji山岳的变形早Paleoproterozoicgranitoids，西北的中国为在TarimCraton和诺思中国Craton之间的关系提供限制。在granitoids底盘之中，Mohe石英闪长岩的岩石典型地显示出adakiticgeochemical特征，与中等K2O/Na2O比率(0.561.17)和高Sr(519619ppm)低Y(9.3720.40ppm)和Yb(0.971.77ppm)集中。岩石有在+2.4和+4.4和2.432.59Ga的弄空的披风Nd模型年龄之间的Nd(t)价值。magmatic锆石有积极Hf(t)价值从+0.40到+7.60和2.432.70Ga的弄空的披风Hf模型年龄，与在2.54和2.65Ga的主要山峰。geochemical和Nd-Hf同位素的特征显示Mohequartz-dioritic岩石可能被高压的变形少年的部分融化形成在在早Paleoproterozoic的post-orogenicextensional政体的外壳的岩石。它建议重要外壳的生长在2.4和2.52.7Ga发生在Quanji山岳和TarimCraton。Quanji山岳和TarimCraton可能在Neoarchean与北方中国Craton分享类似的外壳的进化历史。

简介：ThisstudyreportszirconU-PbandHfisotopesandwhole-rockelementaldataforgranodioritesfromtheEastKunlunorogen.ThezirconU-Pbdatingdefinestheircrystallizationageof235Ma.Therocksarecharacterizedbyhigh-Kcalc-alkaline,magnesianandmetaluminouswith（K2O+Na2O）=6.38wt.%–7.01wt.%,Mg#=42–50[Mg#=100×molarMg/（Mg+FeOT）],A/CNK=0.92–0.98,coupledwithhighεHf（t）valuesfrom-0.65to-1.80.Therockswerederivedfrompartialmeltingofajuvenilemaficcrustalsourcewithinnormalcrustthickness.Thejuvenilelowercrustwasgeneratedbymixinglithosphericmantle-derivedmelt（55%–60%）andsupracrustalmelt（40%–45%）duringtheseafloorsubduction.TogetherwithavailabledatafromtheEastKunlun,itisproposedthatthestudiedMiddleTriassicgranodioriteswereformedinpost-collisionalextensionsetting,inwhichmeltingofthejuvenilelowercrustinresponsetothebasalticmagmaunderplatingresultedintheproductionofhigh-Kgranodioriticmelts.