简介：TheWeishanREmine,locatedontheWeishanLakeinShandongProvince,about200km.fromtheprovincialcapital,isoneofChina’simportantREmines.Intherangeofonly0.85squarekilometerswithadepthof500metershavebeenfoundtenoddmineralveinsrichinREs,ofwhichhasbeenprovedtobetypicalbastnasiteoccurringintheformofsin-glemineralwithhighpurityandcoarsesize.ThemineralfavourstheseparationandextractionofitsREs.Theadvanta-geousfactorsmentionedaboveresultinhighrecoveryofREsandlowproductioncost.Atpresent,themineisprovided

简介：TheYongping,Qianshan,mineissituatedineastcrnJiangxiProvince,attheintersectionoftwogoldmetallogeniczones(Dexing-YongpingandShaoxing-Jinngshan)’Itisalargecopper-sulfUr-tung-stcn-silver-goldoredcposit’Inthispapcrtbcauthorsdiscusstheformationandtypesofgoldore.Goldinthemineoccursmain1yasanassociatcdmincr

简介：ThePeople'sBankofChinahasannounceditsintentiontoraisethedepositreserverateagain,lessthanonemonthafterthelastrateincrease,thismeansthatthedepositreserveratehasincreasedatotaloftentimesthisyear.However,thistimethecentralbankincreasedthedepositre-serveratebyafull1percent,abiggerincreasethanthelastnineadjustmentsof0.5percent.Afterthelatestincrease,

简介：ThispaperreportstheinfluencesofheattransfersurfacepropertiesontheformationofCaSO4foulingdepositionduringflowboilingheattransfer.Thesurfacesofseveraltestheatershavebeentreatedbysurfacemodificationtechniques.suchasdynamicmixingionbeamimplantationanddynamicmixingmagnetronsputteringtoreducesurfaceenergy.Foulingrunswiththeseheaterswerecarriedoutatdifferentheatfluxes,flowvelocitiesandsaltconcentrations.TheresultsshowthatheattransfersurfaceswithlowsurfaceenergyexperiencedsignificantlyareducedformationofCaSO4deposit.

简介：TheYinyanporphyrytindepositisablinddepositassociatedwithasmallgraniteporphyrystock.ThepetrologyandgeochemistryoftheYinyangraniteporphyrysuggestthatitisgeneticallyofthetransfor-mationtype,emplacedatthelatestageoffractionalcrystallizationwithinahigh-levelmagmachamber.Ore-formingfluidsarederivedpredominantlyfromthegraniticmagmaandtheyinteractwiththewallrocksintenselywhenfindingtheirwayupwardsthroughthegraniteporphyry.Fromthelowerpartoftheporphyryupwardsthefollowingalterationzonescanbedistinguished(a)slightlyalteredgraniteporphyry(withweakpotashfeldspathization),(b)protolithionite-quartzgreisenizationzone,(c)to-paz-quartzgreisenizationzone,(d)senicite-quartzsericitizationzone,and（e）silicificationzone(quartzcoreatthesurface).Tinmineralizationisrelatedtogreisenization,especiallytotopaz-quartzgreisenization.Rockandore-formingtemperaturesandoxygenfugacitiesareestimated,respectively.TherearesignificantdifferencesinmanyaspectsbetweentheYinyanporphyrytindepositandvolcan-ic-subvolcanicporphyrytindeposits.

简介：ＧｅｏｃｈｅｍｉｃａｌＢｅｈａｖｉｏｕｒｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｉｎｔｈｅＥｒｄａｏｇｏｕＧｏｌｄＤｅｐｏｓｉｔＰａｎｇＪｉａｎｇｌｉ（庞奖励）（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｇｒａｐｈｙ，ＳｈａｎｘｉＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，...

简介：TheHongshijinggolddeposit,whichoccursintheMiddleandLateCarboniferousvolcanicandpyroclasticrocks,isofthebrittle-ductileshearzonetypecontrolledbyariftbelt.TheHongshijinggolddepositisonecontrolledbyabrittleshearzonelocatedintheLatePaleo-zoicriftzone.Thealtered-rocktypeandquartztypeorebodiesarecontainedinthegold-bearingformation,whichconsistsofbasaltandtuffaceoussandstone.Themajormineralizingstageisat267-261Maandreiterationmineralizingstageat220-209Ma.Theoremineralsincludepy-rite,magnetite,copper,bornite,ferrohydrite,nativegold,andtheganguemineralsincludequartz,sercite,calcite,Fe-dolomite,leucoxene,anorthose,biotite,baria,cajuelite,andagustite.Thewallrockalterationassociatedwithgoldmineralizationcomprisessilicification,carbonization,pyritization,sericitizationandchloritization.Thecontentsofgoldare2.4×10-9inthegold-bearingformation,5.7×10-9inthetuffaceoussandstoneand1.4-1.5×109inthebasalt.AuisassociatedwithTe,Se,Ni,Cu.Au=74.331×Te+0.0335×Ni-0.0211×Cu-2.650.Geochemicalinvestigationsrevealedthatthemineralizingmaterialscamefromthebasaltandtuffaceoussandstoneinthegold-bearingformation.Undertheactionofductilebrittleshearstructure,thegold-bearingformationwasmetamorphosedandaltered,andtheore-formingmaterialsactivated,migratedandmineralized.Themineralizingfluidshowsthreemineralizingstages,withthecharacteristicsofmiddletolowtemperature(381-115℃)andmiddletolowmassfractionsofNaCl(2.18%-16.77%).ThefluidisoftheCa2+-Mg2+-Na+-Cl-typeandH2O-NaClsystem.Accordingtothedatafromhydrogenandoxygenisotopiccomposition(δD=-114.6‰--68.8‰,δ18OH2O=-2.47‰-5.91‰),theconclusioncanbedrawnthatthemineralizingfluidoftheHongshijinggolddepositwasakindofmixedhydrothermalsolutioncomposedmainlyofmeteoricwater,magmaticwaterandformationwaterinbas

简介：Thesystemofmineraldepositstatisticalpredictionmethods,basedonthesimilarity-analogytheory,searchinganomalytheoryandthetheoryofore-controllingbyquantitativeassemblageofmetallotects,canhesummarizedintothefollowingaspects:(1)concludingmainore-controllingconditionsandore-huntingindicatorsfromtypicaldeposits;(2)establishinggeologicalconceptmodelofdeposits;(3)selectinggeologicalvariableanddividingstudyunitsandgrantingspecificvalueforeachvariable;(4)bytheuseofgeologicalandmathematicalgeologymethod,buildingpredicationmodel,delineatingprospectiveareaforexplorationandestimatingthetotalresources;(5)evaluatingtheprospectingwork.ItisgoodpracticetousethissystemformetallogenicprognosisandregionalprospectingofgolddepositinEastJunggar,Xinjiangandhasachievedgreatsuccess.Asaresult,wediscoveredtheKubusugoldmineralizedbelt,delineatedprospectivearea,estimatedtotalresourcesofgoldinthebelta

简介：BasedonthestudyaboutthegeologicalbackgroundofBeiyaGoldDeposit,numericalsimulationwasconductedaboutthethree-dimensionalstructuralstressfieldforBeiyaGoldDepositbyapplyingfiniteelementtheoryandbyemployingalinearelasticitymodel.ResultsofthesimulationindicatethattheBeiyasynclineisafaultedbasin,andahiddenfractureoccursinthewestwingofthesyncline.UndertheactionoftheEW-trendingcompressiveforce,fournearlyNS-trendingfractures(groups)weregeneratedinthestressstretchingareasofthetwowingsofthesyncline,andthesefracturesconstitutefavorabletectonicpositionsfortheupwardintrusionofporphyrymagmaandtheoccurrenceofAu-Pb-Znpolymetallicdeposits.

简介：TheDajiangpingpyritedepositlocatedinthemiddlesectoroftheYunkaiupliftinwesternGuangdongisastratiformsulphidedepositoccurringinSinianmarineclasticandfineclasticrocks.Theformationofthedepositwasrelatedtosubmarineexhalationandhotbrinedeposition.Apartofitwasreformedbylate-stagehydrothermalsolution.Theδ34Svaluesofpyritevaryfrom-25.55‰to+21.07‰,whichareinverselyproportionaltothecontentoforganiccarboninoreandpyrite.Passingfromstripedfine-grainedpyriteoretomassivecoarse-grainedpyriteore,i.e.fromsouthtonorth,thesulphurisotopiccompositionchangesfromthelightsulphur-enrichedonetotheheavysulphur-enrichedone.Theleadisotopiccompositionofstripedoreisconsistentwiththatofthecountryrocksoforebodiesandtheleadisradiogenicleadderivedfromtheuppercrust.Theleadisotopiccompositionofmassiveoreisrelativelyhomogeneousandits206Pb/204Pb,207Pb/204Pband208Pb/204Pbratiosareabitlo

简介：Thesuper-largePb-ZndepositatFankouisverycomplexinmetallogenicmechanism.Syngeneticbrinesedimentation,hotsubmarinespringeruption-accumulation,syngeneticsedimentation-vadosebrinereplacementhadbeensupposedasthegeneticmodelsbefore.Underthesemodels,syngeneticmineralizationshouldbedominantinoreformation.However,aseriesofgeologicalandgeochemicalpropertiesinvestigatedbyauthorsofthispaperarecontrarytothesemodels.Therefore,theauthorsheresuggestthatthisdepositisatypicalpolygeneticcompoundoredepositwhichsharethepropertiesofmultistagesofgeotectonicevolution,multifactorsofmineralizationcontrol,multisystemofmaterialderivationofmineralization,multimodesofmineralizationandmultitypesofgenesis.

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简介：SituatedinthenortheasternpartofJjangxiProvince,southChina,Jinshangolddepositgcotectoni-callybelongstoapartoftheDekingmini-crustobody.A8asub-elementofthesoutheasternsectionofJjangnancrustobody,theDekingmini-crustobodyislimitedtothenorthwestbyZhanggongshanmini-crustobodywiththeboundaryofLc’anjtangfaul

简介：TheMayangCudeposit,westernHunanisamiddle-scalesandstone-typeCudepositpredominantofnativecopper.Fromanangleofgeologicalintegrativefield,fracturegeochemicalfeaturesarestudidedanddiscussedinthispaper.Infracturestructure,variantregularityandtheratiosofelementcouplesparticipatinginmetallogensisthattheirgeochemicalnaturesaresimilarorstronglycorrelative,revealchanginglawsofmetallogenictemperatureandpressurefieldsandmigratingdirectionofmetallogenicelements.Thetheoreticalstudytalliesmuchbetterwithproductivepractice.Theyaremeaningfultoconductprospectingandexployation.

简介：Recently,theBureauofGeologyandMineralExplorationandDevelopmentofGuizhouProvincedetectedanabout140milliontonsresourceinZheng'anCounty,100milliontonsofwhichwasbauxite.Thisistheseconddetectedsuperlarge-scaledbauxitedepositaftertheDazhuyuanbauxitedepositinWuchuanCounty.Intheprospectingarea,theaveragethicknessofvisibledepositis1.8m,andtheaveragegradeofAl2O3is

简介：ThegeologicalfeaturesoftheLongshanAu-Sbdepositsaresystematicallydescribed.Mineralizationconditions,sourcesoforematerialsandmetallogeneticmechanismarealsoanalysedaccordingtosulfur,oxygenisotopecomposition,pyritetypomorphicfeaturesandfluidinclusionthermometrydating,Theresultsshowthatitisasedimentarymetamophichydrothermaldeposit.

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简介：TheLamasucopperpolymetallicmineralizedregionliesinthesouthofWenquanCounty,XinjiangandintheNorthwestlakesideoftheSailimuLake.Seenfromthegeotectonicposition,itbelongstoNorthTianshangeodomesystem,Tianshandiwaregion,CentralAsiancrustobody.Copperandzincpolymetallicorebodieshadbeenformedintheskarnofthecontact,betweenthemetamophiccarbonaterocksoftheKuximqiekGroup,JixianSystemandearlymid-Variseanacidicrockbodies.Theformationoftheoredepositwastheresultofthesuccessiveactivitiesofthecrustandmantleandthetectonicandmagmaticactivities.

简介：Thetransportprocessof12CionsinwaterwasstudiedwithSRIMcodeandGeant4toolkit.TheSRIMresultsindicatethatthetransversediffusionof12Cionbeamcausesdistortionofenergydepositalongthebeamdirection.Thedistortionbecomesmorenotableasthetrans-versediffusionincreases.ThesimulationresultsofGeant4indicatethattheinfluenceofsecondaryfragmentsonenergydepositdistributionwouldbethemainfactorcausingthedistortioninhigherenergyrange.Intheregionadjacenttothebeamlinewherethecontributionfrom12Cionsdomi-nates,thecontributionsfromsecondaryfragmentsareignorable.Thefurtherfromthebeamaxistheregionlocates,thelargerthecontributionsfromsecondaryfragments,untilthecontributionsfromsecondaryfragmentsareignorable.Thefurtherfromthebeamaxistheregionlocates,thelargerthecontributionsfromsecondaryfragments,untilthecontributionsfromsecondaryfrag-mentsexceedthatof12C.Amongallthesecondaryfragments,thecontributionsofH,HeandBionsaremostlynotable.Itisalsofoundthatsomepositron-emittingsecondaryfragmentscouldbeveryusefulforpositionemittingtomography(PET).