简介：Beforeintruding,primarymagmashaveundergoneliquationandpartialcrystallizationatdepth;asaresultthemagmasarepartitionedintobarrenmagma,ore-bearingmagma,ore-richmagmaandoremagma,whichthenascendandareinjectedintothepresentlocationsonceormultipletimes,thusformingoredeposits.Theabove-mentionedmineralizingprocessisknownasdeep-seatedmagmaticliquation-injectionmineralization.Thevolumeofthebarrenmagmaisgenerallymuchlargerthanthoseoftheore-bearingmagma,ore-richmagmaandoremagma.Intheascendingprocess,mostofthebarrenmagmaintrudesintodifferentlocationsoroutpoursontothegroundsurface,formingintrusionsorlavaflows.Therestbarrenmagma,ore-bearingmagma,ore-richmagmaandoremagmamayeithermultipletimesinjectintothesamespaceinwhichrocksandoresareformedorseparatelyinjectintodifferentspacesinwhichrocksandoresareformed.Theintrusionscontainingsuchdeep-seatedmagmaticliquation-injectiondepositshaveamuchsmallervolume,greaterorepotentialandhigheroregradethanthatofin-situmagmaticliquationdeposits.Consequentlythismineralizingprocessresultsintheformationoflargedepositsinsmallintrusions.

简介：

简介：Afacileandefficientstrategywasreportedforthepreparationofgraphenenanosheets-Ag2Shybridbyasimplehydrothermalprocess.First,Ag2Sparticlesdepositedonthesurfaceofgrapheneoxide(GO)sheet.GOwasthenreducedbyhydrazinehydratetographene.TheresultsofX-raydiffraction(XRD)andFouriertransforminfrared(FTIR)demonstratedtheefficientreductionofGOtographene.Transmissionelectronmicroscopy(TEM)imageofthesamplerevealsthemorphologyofthearchitectureofgraphene-Ag2Shybrid.Ultraviolet-visiblespectroscopy(UV-Vis)andphotoluminescence(PL)measurementwerefurtheremployedtostudytheopticalpropertiesoftheobtainednanocomposite.Thisworkcanbeextendedtodesignothergraphene-basedhybridnanomaterials,andtheas-grownarchitecturesmayholdpromiseformanyapplications.

简介：ApreliminaryorganicgeochemicalstudyshowsthatthesulphideoresfromthehydrothermaldepositoftheOkinawaTrougharegenerallylowinthetotalorganiccarbonandextremelylowinthesolubleorganicmatter.Inthealiphatichydrocarbonfraction,then-alkanesrangefromC15toC35,withusualmaximainthemiddlen-C20regionandstrongodd-carbonnumberpredominancewhenn>C25(CPI=1.2).Thedominantanaloginthearomaticfractionisphenanthrene,apolynucleararomatichydrocarbon,whichprovidesevidenceforhydrothermalactivity.Theorganicmatterderivedmainlyfrommarineplanktonicandterrigenousvascularplantsisentrappedinahigh-temperatureregimesuchasanactivechimneyandcooledquicklyinthesulphideoresontheseafloor.Organicmatterandsulphidesaredefinitelyproductsofahigh-temperaturealteration.ThebiomarkercompoundsindicatethattheoresareformedunderlowEhandpHconditions梐reducingtoanoxicenvironment,whichisfavourableforsulphatestobereducedintosulphidesbybiogenic(bacterial)orabiogenicactivity.

简介：Nanofibrous碳的材料(NFC)作为有许多应用的材料的一个新班，能催化H2S的选择氧化到硫。在在H2S氧化的NFC结构和它的活动和选择之间的关联是坚定的。如果有更多的订的结构的NFC被综合，在碳的原来的催化剂的部分被增加在催化剂积累的碳减少，选择能被改进，这被表明。

简介：Akindofsulphide,CaS:Eu2+,activatedbyeuropiumionforwhiteLEDlightingwassynthesizedviasolid-statereactionrouteinreducingatmospheres.Thephosphorswerethenencapsulatedwithsiliconeresin.Moreover,chemicalstructureofthephosphorswascharacterizedbyXRD.MicrostructureofthepowderswasobservedbySEM.Spectraofexcitationandemissionforthephosphorswerealsoobtainedbyaspectrophotometer.Effectofprocessingparametersontheluminescentpropertiesofthepowderswassystematicallystudiedtoresultinthephosphorswithgoodchemicalstabilityandmaximalrelativeluminescentintensity.

简介：AsymplectiteofpyriteandmagnetiteinthemassivesulphideoreoftheMashanmine,AnhuiProvince,isinterpretedtohavebeenformedbytheirreplacingearlierpyrrhotite.Thecompositionsofpyrrhotite,pyriteandmagnetiterelatedtothistexturearegivenbyelectronmicroprobeanalysis.Suchatextureislikelytobeformedwhentheore-formingsystemreachesthethree-phasepointofpyrrhotite,pyriteandmagnetitefromthepyrrhotitestabilityfield.Theverysmallprobabilityforthesystemtoreachthispointcouldbeusedtoaccountfortherareoccurrenceofsuchsymplectiteinnaturalores.

简介：Adistinctred-shiftto660nm-featuredlongerwavelengthofeuropiumdopedcalciumsulphidenanocrystalswasobservedinamicrowave(MW)-assistedsolvothermalsynthesisprocedure.Thisred-shiftwasprobablyduetoacombinedeffectfromMg2+codopingandstrainaccumulationatgrainboundaries.Thelatteroriginatedfromtheformationofsmallgrainswithanaveragesizeofaround200nminmicrometersizedcrystalsuponMg2+codoping.Inparticular,MWelectromagneticfieldsuppressedgraingrowthandenabledareconstructionofatomsattheinnergrainboundaryatwhichthefieldstrengthwasintensifiedaroundrareearthionsinhostlattices.ThisMWsynthesisrouteprovidedanoptiontoprepareluminescentcrystalswiththedesiredblue-excitablelongerwavelengthemission.

简介：Pressuresolutionisacommonphenomenoninmassivesulphidezinc-leaddepositsofwesternCanadaandmayhavebeenanimportantfactorleadingtothemobilizationofore-formingmaterialsduringdiagenesis,deformationandmetamorphismofsedimentaryores.Thecontrolofductileshearzonesovergoldmineralizationcouldbeexplainedinviewofpressuresolutionofgold-bearingminer-alsundershearingstressandthetesultantmobilizationofthismetal.

简介：Voluminousplatinum-groupmineral（PGM）inclusionsincludingerlichmanite（Os,Ru）S2,laurite（Ru,Os）S2,andirarsite（Ir,Os,Ru,Rh）AsS,aswellasnativeosmiumOs（Ir）andinclusionsofbasemetalsulphides（BMS）,includingmillerite（NiS）,heazlewoodite（Ni3S2）,covellite（CuS）anddigenite（Cu3S2）,accompaniedbynativeiron,havebeenidentifiedinchromititesoftheZedangophiolite,Tibet.ThePGMsoccurasbothinclusionsinmagnesiochromitegrainsandassmallinterstitialgranulesbetweenthem;mostarelessthan10μminsizeandvaryinshapefromeuhedraltoanhedral.Theyoccureitherassingleorcomposite（biphaseorpolyphase）grainscomposedsolelyofPGM,orPGMassociatedwithsilicategrains.Os-,Ir-,andRu-richPGMsarethecommonspeciesandPt-,Pd-,andRh-richvarietieshavenotbeenidentified.SulfurfugacityandtemperatureappeartobethemainfactorsthatcontrolledthePGEmineralogyduringcrystallizationofthehostchromititeintheuppermantle.Iftheactivityofchalcogenides（suchasS,andAs）islow,PGEclusterswillremainsuspendedinthesilicatemeltuntiltheycancoalescetoformalloys.Underappropriateconditionsof?S2and?O2,PGEalloysmightreactwiththemelttoformsulfides-sulfarsenides.Thus,wesuggestthattheOs,IrandRumetallicclustersandalloysintheZedangchromititescrystallizedfirstunderhightemperatureandlow?S2,followedbycrystallizationofsulphidesofthelaurite-erlichmanite,solid-solutionseriesasthemagmacooledand?S2increased.TheabundanceofprimaryBMSinthechromititessuggeststhat?S2reachedrelativelyhighvaluesduringthefinalstagesofmagnesiochromitecrystallization.ThediversityofthePGEminerals,incombinationwithdifferencesinthepetrologicalcharacteristicsofthemagnesiochromites,suggestdifferentdegreesofpartialmelting,perhapsatdifferentdepthsinthemantle.Theestimatedparentalmagmacompositionsuggestsformationinasuprasubductionzone