简介：TherearetwomaintypesofirondepositsintheMiddle-LowerYangtzeValleydistrict.Bothofthemunderwentpost-magmatichydrothermalprocessesduringoreformation.Ironinthehydrothermalorebodieswasderivedlargelythroughmobilizationfromsubstantiallyconsolidateddiroiticintrusives.Wall-rochalterationzonationindicatesthatiron-mobilizinghydrothermalfluidsevolvedinatrendofdecreasingalkalinity,whichissuggestedbyregularlydistributedwall-rockalterationsformedbyiron-mobilizinghydrothermalfluidsandisincontradictionwiththecurrentchloride,chloridecomplexandbicarbonatemodelsforironmobilization.ThecloseassociationofcarbonatizationwithironoresandthehighconcentrationsofreducedgasessuchasCO,CH4andH2influidinclusionssuggestthatironismostprobablytransportedintheformofironcarbonylsduringpost-magmatichydrothermalprocesses.Inthelightoftheironcarbonylmobilizationmodel,explanationsaremadeoftheconstraintsonoresofsomegeologicfactorssuchasmelanocraticalteration,carbonatization,carbonatestrata,structuralfractures,cyptoexplosivepipesandembryoores.

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简介：在铁氢氧化物的矿化作用之上调查多糖的modulating效果，用器官的底层在这被进行的葡聚糖和chitosan的一系列模拟biornineralization实验糊。结果证明那铁氢氧化物胶化在多糖分子起核心作用并且成长，与葡聚糖或chitosan的自我装配的效果，纳米大小的akaganeite被形成。铁oxyhydroxide的结构的类型从铁氢氧化物胶化形成了的形状，尺寸和水晶取决于多糖和它的集中的类型。

简介：ThecontentsanddistributionsofCaCO3,Fe2O3.FeOandfreeFe2O3intheWeinanloesssectionofShaanxiProvinceofChinawereinvestigatedthroughdensesampling.TheresultsshowthatthecontentsofCaCO3andtherationofFe2O3/FeOmaybechosenasproxyindicesfortheprecipitationandtemperaturechangesintheformationtimeofthestrata,respectively.Accordingtothesegeochemicalindices,sixstagesofplaeoclimateevolutionareproposedinthisregionsince142kaB.P.,andsecondaryclimatechangesarediscussedaswellbasedonthecurvesofgeochemicalindices.

简介：IntroductionRutile,acommonoxidemineral,widelyoccursindifferentgeologicalenviron-ments.Inigneousrocks,especiallyinplutonicrocks,itexistsasaminormineralingranularform,sometimesintheformoflargecrystalsinpegmatites.Asanaccessarymineral,rutilecanbefoundinmanymetamorphicrockssuchasamphiboliteandeclogite.Itisnotararecasetofindrutileinsedimentsasadetritalmineral.

简介：Inthispapertheseven-stepcontinuousextractingmethodwasemployedinthestudyofchemicalformsofthesixheavymetalsCo,Zn,Pb,Cu,CrandMn,Theresultshowsthattheetalsinthelateritearepresentinthechemicalformofcrystallineironoxidesandresidues,andtheyaretransformedtowaredorganicandexchangeableformsinthesurfacesoil.Linearregressionanalysisindicatesthattheaboveheavymetalshaveapositivecorrelationwiththecrystallineironoxideminerals.Thecrystallineironoxidemineralshaveaveryimportantroletoplayintheenrichmentofheavymetals,especiallythesolidcomponentsinthelaterite.

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