简介:Separationtechnologyofrareearthelements(REEs),asthecriticalstepintheseparationprocess,hadlongbeenfraughtwithtechnicaldifficulty.AresearchprojectconductedbyBaotouShiboRareEarthExtraction&EquipmentCo.Ltd.,BaotouREEResearchInstitute,andBaotouSteel&REEGroupHi-TechCo.Ltd(InnerMongolia),hassuccessfullysolvedtheproblemusingacentrifugalextractorandadvancedtechniquestoachieveakeybreakthrough.ThekeydeviceofthewholeproductionlinecontainsCTL-500FBcentrifugalextractorsanddigitalflowsystemequipment.Employmentofanautomaticcontrollingsystemanditsfullyfunctionaloperationsystem,alongwithvarioussupportivefacilities,fulfilstheseparationprocessesforvariousrareearthmaterials.Comparedwithconventionalbox-typeseparationtechnology,thisnewapproachsignificantlyimprovesthestirringintensity,thusimprovingproduction
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简介:Inthelastseveralyearssince2004animportantnewfindinghasbeenunveiledbycombinedeffortsduetoJapanese(SatoruTanaka),French(RenaudDeguen,TAlbousierreandMarcMonnereau),AmericanandChinesegeophysicists(XiaodongSongandVernonFCormier)whoemployedfromunambiguousdetailedseismologicalevidenceandexplainedbycleartheoreticalandsoundlaboratoryargumentsdrawnfromfluiddynamicsthatthereexistsastrong
简介:Tectonically,theareaunderstudyisknownastheSoutbeastChinaDiwaRegionwhicbbasexpcriencedthefollowingthrccstagesoftcctonicdeve1opment:l)thegeosynclinalstage,2)theplatformstage,3)thediwastage.Inthediwastagcandinitsmaximum-mobilitypcriodinparticular,tcctonicandisneousactivitieswcrestrong,extcnsive,ftcqucn
简介:TheSongkeNo.2well(easternhole)(referredtoasWellSK-2),oneofthe"twowellsandfourholes"oftheDeepContinentalScientificDrillingEngineeringProjectintheSongliaoBasin,isinAndaCity,HeilongjiangProvince,andwasofficiallycompletedonMay26,2018.TliescientificgoalsofWellSK-2coverfouraspects:paleoclimateresearch,resourceandenergyexploration,primarygeologicalresearch,anddevelopmentofdeepearthexplorationtechniques.Sincetheofficialcommencementofdrillingin2014,theWellSK-2scientificdrillingengineeringteamhasorganizedandimplementeddrillingforcoring,insitulogging,chemicalanalysisofcoreelements,anddeepstructuralexplorationaroundthewell.Currently,thefollowingpreliminaryscientificresearchprogresshasbeenmade:4334.81minsitucoredatahasbeenobtained;thecentimeter-levelhigh-resolutioncharacterizationofthemostcompleteandcontinuousCretaceouscontinentalstrataeverunearthedhasbeencompleted,andthestandardprofileofcontinentalstratahasbeeninitiallyestablished;theunconventionalnaturalgasresourcesandbasin-typehotdryrocksinthedeepSongliaoBasinwerefoundtohavegoodprospectsforexplorationanddevelopment;theclimaticevolutionaryhistoryoftheCretaceouscontinentalstratawasrebuiltforthefirsttime,coveringhundredsofthousandstomillionsofyears,andthemajoreventsofCretaceousclimatefluctuationshavebeendiscovered;alltheserevealstrongevidenceforthesubductionandaggregationofpaleo-oceanplates,providingatheoreticalbasisforthere-recognitionofthegenesisoftheSongliaoBasinandfordeepearthoilandgasexploration.TheimplementationoftheDeepContinentalScientificDrillingEngineeringProjectintheSongliaoBasinisofgreatsignificanceforexploringthemysteriesoftheEarthandsolvingmajorproblemssuchasthoserelatedtothedeepenergyenvironment.Itisasolidstepalongtheroadof"goingdeepintotheEarth".
简介:The2018InternationalSymposiumonDeepEarthExplorationandPractices(DEEP)willbeheldinBeijing,ChinainOct24-26.ThesymposiuminthisyearwillemphasizeonupdatedprogressofSinoProbe-Ⅰ,andrecentresearchprogressesofthegloballithosphereresearch.Themeetingwillserveasaplatformwheretheparticipantsexchangeideasaboutdeepexplorationofthelithosphere,betterunderstanddeepprocessesintheearth,expandthenewknowledgeintopracticalapplications,andconsiderthefutureinternationalcollaborationondeepexplorationoftheearth.ThesymposiumishostedbySinoprobe,whichisfundedbytheChineseGovernmentwithunprecedentedscopeandscientificambition.
简介:Rareearthandtraceelementsaredeterminedforcassiteritefromavein—typeorebody,alensandasheeted-typeorebodyintheDachangSn-polymetallicorefield,GuangxiProvince.Cassiteritefromthevein-typeorebodyhasrareearthandtraceelementcharacteristicssimilartothatofDachangbiotitegraniteofLateYanshanage,showinganinheritableandageneticrelationship.Cassiteritesfromthelensandsheeted-veinorebodyhaverareearthandtraceelementcharacteristicsgreatlydifferentfromthoseofthevein-typecassiteriteandthegranite,showingdistinctlyhighercontentsoftheore-formingelementsAs,Sb.Zn.Agetc.andapositiveEuanomalyandanegativeCeanomaly.Thedifferenceofrareearthandtraceelementcharacteristicsforcassiteritefromtwokindsoforebodiesreflectsthecompositionaldifferenceofore-formingsolutions.Authorssuggestthatthelensandsheeted—veinorebodywasofnonmagmatic,mixedwithundergroundhotbrineorigin,andthatthiskindofhotbrinereactedwithDevonian
简介:Forthefirsttime,wepresenttherareearthelement(REE)andsulfurisotopiccompositionofhydrothermalprecipitatesrecoveredfromtheTangyinhydrothermalfield(THF),OkinawaTroughatawaterdepthof1206m.Thenaturalsulfursamplesexhibitthelowest∑REEconcentrations(∑REE=0.65×10^-6-4.580×10^-6)followedbymetalsulfides(∑REE=1.71×10^-6-11.63×10^-6).Bycontrast,thenaturalsulfur-sedimentsampleshavemaximum∑REEconcentrations(∑REE=11.54×10^-6-33.06×10^-6),significantlylowerthanthoseofthevolcanicandsedimentsamples.Nevertheless,theδEu,δCe,(La/Yb)N,La/Sm,(Gd/Yb)Nandnormalizedpatternsofthenaturalsulfurandmetalsulfideshowthemostsimilaritytothesediment.MosthydrothermalprecipitatesamplesarecharacterizedbyenrichmentsofLREE(LREE/HREE=10.09-24.53)aridslightlynegativeEuanomaliesornoanomaly(δEu=0.48-0.99),whicharedifferentfromthehydrothermalfluidfromsediment-freemid-oceanicridgesandback-arebasins,butidenticaltothesulfidesfromtheJadehydrothermalfield.Thelowertemperatureandmoreoxidizingconditionsproducedbythemixingbetweenseawaterandhydrothermalfluidsfurtherattenuatetheleachingabilityofhydrothermalfluid,inducinglowerREEconcentrationsfornaturalsulfurcomparedwithmetalsulfide;meanwhile,thenegativeEuanomalyisalsoweakenedoralmostabsent.Thesulfurisotopiccompositionsofthenaturalsulfur(δ^34S=3.20‰-5.01‰,mean4.23‰)andmetalsulfidesamples(δ34S=0.82‰-0.89‰,mean0.85‰)revealthatthesulfurofthechimneyissourcedfrommagmaticdegassing.
简介:WeperformedasystematictraceandrareearthelementanalysisforthebeddedFe-MncarbonaterocksrelatedtothestratiformAg-Pb-ZnmineralizationintheLengshuikengoredistrict,JiangxiProvince,SouthChina.ThreetypesofFe-Mncarbonatesaredistinguished,namely,themassive,breccia,andveintypes.Bothcarbonateandsilicatefractionsinthesamplesareanalyzedfortheirtraceandrareearthelementconcentrationsusingastepacid-leachingtechnique.OurresultsshowthatthecarbonatefractionsinthemassivetypesampleshavethelowestREEconcentrationsbutpronouncedpositiveEuandYanomalieswithEu/Eu*valuefrom1.3to6.2andY/Hovaluefrom40.1to59.5,andsimilarcharacteristicsarealsoshownforthesilicatefractionsinthemassivetypesamples(Eu/Eu*=1.0–6.7,Y/Ho=20.7–55.1).TheseREEcharacteristicsaresimilartothoseofSedextypemassivesulfidedepositsworldwide,andwesuggestthatthemassivetypeFe-Mncarbonaterockswerelikelyformedfromanexhalativevolcanic-hydrothermalfluidfeedingthedepressionbasinofavolcaniclake.Thehighconcentrationsofredox-sensitiveelementsandratiossuchasU/Th,V/CrandV/(V+Ni)indicateadysoxicenvironmentfortheFe-Mncarbonatedeposition.Incontrast,thebrecciatypeandveintypeFe-Mncarbonatesamplesshowdifferenttraceandrareearthelementfeaturesfromthoseofmassivetypesamples,andtheyaremoresimilartothevolcanicrocksandmagmatic-hydrothermalfluidsintheLengshuikengoredistrictandmayreflectstrongoverprintingfromvolcanicandsub-volcanicmagmatismrelatedtotheporphyrytypemineralizationinthedistrict.
简介:In1997,IGCPProjectNo.410wasestablishedtoappraiseknownrecordsofOrdovicianbiotas,inordertoevaluateoneofthegreatest-everdiversificationsoflifeonEarth,between489and443millionyearsago.Datacollectionandanalysisofbiodiversitywerecoordinatedthroughsevenregionalteams,andaglobal“clade”team.