简介：BasedonPb-Pbisochrondataofmorethan40Precambrianpolymetallicdeposits,theauthorsconsiderthattherearefourmineralizationperiodsforthePrecambriancopperdepositsinChina,andthemajorcopperdepositswereformedatabout1800Ma;therearethreemineralizationperiodsforgolddepositsformedfromArchaeantoProterozoic.BystudyinghundredsofleadisotopedatafromsomeMesozoiccontinentalsubvolcanicCuandAgpolymetallicdepositsandfine-disseminatedgolddeposits,theauthorsfoundthatthecalculationbasedontheleadsingle-stageevolutionmodelortwo-stageevolutionmodelcannotgivethetrueore-formingagesbutcanprovidemoreinformationaboutmineralizationandmaterialsourcesofthedeposits.

简介：长石和Pb(NO_3)_2在TAU=380degC被混合并且反应到synthesizePb长石。在XRD(X光检查衍射)产品的模式，五座山峰的d价值(踱步的晶体点阵)是0.654,0.342,0.332,0.327和0.257nm。XPS分析结果证明在长石的Pb4f_(7/2)的有约束力的精力在137.81之间-138.03eV。Pb~(2+)能通过离子交换反应在长石结构代替碱和碱地球阳离子形成Pb长石。

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：1IntroductionDengfuxianorefieldliesattheintersectionoftheQin-HangCombinedZone(QCZ)andtheNanlingMetallogenic,andcomprisesXiangdongW-Sndeposit(AlsoknownasDengfuxianW-Sndeposit),Jiguanshi

简介：ThreelogarithmiclinearequationsbetweenDMeV/Land[mNaCl],andtherelationshipofDMeV/LversusF/ClorK/NamoleratioshavebeenestablishedbytheexperimentsofthepartitioningofPbandZnbetweengraniticsilicatemeltandaqueousfluid.Theseresultshavebeenusedtoquantitativelystudysomeessentialproblems,suchasthepossibilityanddegreeofPb-Znmineralizationinthesystemofgraniticmagmaandhydrothermalfluid,andtheinfluenceoftherelativecontentsofalkaliandvolatilesonthePb-Znmineralizationinthesamesystem.Somenewpointshavebeenputforwardinthispaper.

简介：1IntroductionTheMaozuPb–Zndeposit,locatedintheNortheastofYunnanProvince,southwestChina,isatypicalcarbonate-hosteddepositintheNortheastofYunnanPb–Znmetallogenicprovince.Fluoriteisthemaingangue

简介：ThePengshanSn-Pb-ZnpolymetallicorefieldislocatedintheJiujiang-Ruichangregion,whichisasegmentofthemiddle-lowerYangtzeRivermetallogenicbelt.ThePengshanlateYanshanianburiedplutonwithgraniticcompositionisacalc-alkalinepluton,intrusionofwhichisresponsiblefortheformationoftheSn-Pb-Znpolymetallicdepositthroughprovidingthermodynamicconditionandore-formingmaterial.Thelong-activebasementriftsinitiallyformedintheJinningperiodandthedomalstructurewithinducedsecondaryorderfaultsformedbyemplacementofthepluton,suchasring-detachmentfault,top-detachmentfaultandjointfissure,actasthepassage-wayformagmaandore-formingfluidandimpoundingstructurefororedeposit.ThemagmatoformtheplutonwithDI＞90isintensivelydifferentiated.Thevariationoftheore-formingfluidincompositionwithfallingintemperaturecausedbyactionofmagmatichydrothermalconvectionsystemcombinedwithgroundwaterconvectionsystemattributestomineralizationofvarioustypesintheorefield.Themineralizationprocesscanbedividedintosixstages,i.e.,greisenization,skarnizationofearlystage,fluorite-stanniferoussilicationstage,skarnizationofadvancedstage,quartzandcassiterite-sulfurationstageandcarbonationstage.Themineralassemblagesformedindifferentmineralizationstagesaredifferentowingtotemperaturechangingandmaybeoverlappedinspace.Malayaiteisrecognizedfromthemineralassemblageformedinthefluorite-stanniferoussilicationstage.TheoresinthePengshanSn-Pb-ZnpolymetallicdepositarespatiallyzonedwithvariationfromAs-SnmineralassemblageofhightemperatureintheinnerzonethroughSn-PbandPb-Zn-Agmineralassemblageofmiddletemperatureinthemiddlezonetofluoritemineralassemblageoflowtemperatureintheouterzone.TheexchangingofSn,MgandFebetweenbiotiteandhydrothermalfluidresultedfromvariationofphysicochemicalconditionduringevolutionprocessesofthehydrothermalflu

简介：在结晶化以后沿着Yangtzecraton和他们的变形历史的西方边缘澄清变形侵入的关系，石油化学并且踪迹元素geochemical人物，标明日期的锆石虾U-Pb，和化学药品从在Kangding的Neoproterozoic变形侵入的共存的角闪石和斜长石的作文()，四川()省，和Yuanmou()，云南()省，被学习。与以前的出版数据结合了，在Yangtzecraton的西方边缘的Kangding花岗石的plutons和Yuanmou建筑群通常在一样的句号形成了，这被显示。在700妈的变形事件广泛地存在，至少在四川从Kangding区域盖住到Eshan()在中央云南的区域。而且，角闪岩外形可以代表山峰地区性的变形状况。

简介：Henglingguan和Beiyu变形granitoids，在Zhongtiaoshan前寒武纪的建筑群的西北分布式，包括trondhjemites和计算碱的monzogranites，与太古代的ZhaiziTTG片麻岩显示恼人的接触。并且Beiyumetamorphicgranitoids主要由trondhjemites组成，在Hujiayu背斜褶层的核心分布式。分别地，标明日期加权平均值~(207)Pb/~(206)Pb变老的数据表演的新虾锆石U-Pb是为Henglingguan变形计算碱的monzogranites和Beiyumetamorphictrondhjemites的2435.9Maand2477妈并且揭示600妈继承了的～2在magmatic锆石的核心。Whole-rockgeochemical数据显示那所有Henglingguan和Beiyu变形trondhjemitesandcalc碱的monzogranites属于遇见了铝土的中等钾、高钾的calc-alkalineseries。这些岩石被相对高的全部的碱内容描绘(Na_2O+K_2O，在to9.08%上面)，弄空的Nb，Ta，P和Ti，和衰退权利的REE模式与对高LREEs/HREEsfractionation中等(吝啬的比率(La/Yb)_n=25)。在多元素蜘蛛图的Henglingguan和Beiyumetamorphictrondhjemites显示negativeRb，Th和K异例由原始披风使正常化。Sm-Nd同位素的数据表明这些granitoids有起始的ε_(Nd)到+2.4和Nd的(t)=-1.2弄空T_(MD)=的披风模型年龄2622马马。所有thesegeochemical特征显示这些granitoids在一条大陆边缘的弧被形成，并且trondhjemites主要从少年的部分融化发源玄武岩的材料并且然而，Henglingguan变形计算碱的monzogranites源于在一条大陆边缘的弧下面在古老的外壳中材料再循环。花岗石的岩浆在他们的形成期间经历了污染和分离结晶。

简介：Geza岛弧是一个著名矿化作用集中区域，在西藏的高原的东方边缘的Sanjiang领域的部分。在最近的年里，几迟了的Yanshanian花岗石的侵入和联系存款在这个区域被发现了，在桃花源，区域是其一最大Laba铝存款。以前的研究建议预定Laba矿化作用是85±2妈。然而，granodioritic斑岩的年龄仍然保持未知。在这研究，从忍受辉钼矿的granodioritic斑岩的三件样品锆石标明日期的LA-ICP-MSU-Pb与85.00±的产生日期一起被进行了0.23妈(MSWD=0.58)，85.28±0.28妈(MSWD=1.12)，并且84.83±0.26妈(MSWD=0.79)分别地，显示这些granodioritic斑岩在∼85附近在迟了的Yanshanian形成了妈。与矿化作用的地质的特征结合了，时间地，Laba存款遗传上空间地与granodioritic斑岩被联系。另外，Laba存款的年龄与另外的迟了的Yanshanian侵入和矿化作用一致，建议矿化作用可能在在迟了的白垩纪期间的intra板extensional环境下面被产生。

简介：<正>PRELIMINARYSTUDYONTHEORE-FORMINGCONDITIONSOFTHEAu-Pb-QUARTZVEINTYPEOREDEPOSIT,CHINAHeZhili,XuJiuhua,YangZhenlinandDuJafeng(Dept.ofGeol.,Univ.ofScie.andTech.Beijing,100083Beijing,China)Ore-formingcondition,Au-Pb-quartzvein,oredeposit,ChinaTherearefewAu-Pb-QuartzveintypeoredepositsinothercountriesexceptChina.Itmightberelatedtothegeohistoryandgeotectonicbackground.However,thiskindoforedeposithasanimportanteconomicalsignificanceinChina.Itsformationisduetothedis-tinctivegeologicalconditionsofchina.WendongAu-Pb-QuartztypeoredepositincludingWenyuandDongchuanginXiaoqinlinggoldfieldisthemosttypical.Itisapolygeneticandcompoundoredeposit,JintongchaandotherdepositslyingtothewestofitinXiaoqinlingareaareAu-Pb-Quartzveintypeoredeposits.OthersofthisarealyingtotheeastofJintongchaareAu-Quartzveintype.Thisphenomenonstemsfromthezonnaldistributionofminernalde-positsa

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简介：TheYangshangolddepositisasuper-largefine-graineddisseminatedgolddepositlocatedinsouthernGansuProvince.ItsmetallogenicagehasbeendeterminedbyusingthecathodoluminescenceimageandionprobeU-Pbdatingtechniques.Itisfoundthatzirconsfromquartzveinletofthefine-graineddisseminatedgoldoreshowcharactersofmagmaticoriginwithprismidiomorphism,oscillatoryzoninganddominantTh/Uratiosof0.5-1.5.Threemainpopulationsofzirconsareobtained,givingaverage206pb/238Uagesof197.6±1.7Ma,126.9±3.2Maand51.2±l.3Marespectively.ThefirstagecorrespondstotheK-Arageoftheplagiogranitedike,whilethelattertwoagesindicatethatburiedCretaceousandTertiaryintrusivesexistintheorefield,suggestingthattheYangshangolddepositwasgeneticallyrelatedtothethreemagmatichydrothermalactivities.Bycontrast,zirconsfromcoarsegold-bearingquartzveinintheminingareaaremucholderthanthehostrock,indicatingthattheveinwasformedearlierandwasnotcontaminatedbylatermagmaticfluids.ItisconcludedthatthecouplingofmultiperiodichydrothermalactivitiesintheminingareahascontributedalottomineralizationoftheYangshangolddeposit.

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简介：InNanlin,alargenumberofPb-ZndcpositsandSbdcpositsincludingtheworldfamousgiantSbdepositcalledXikuangshanmineareDevoniancarbonaterock-liosted,Ourjnvcstigationsuggcststhatmanyofthcscdcpositswercmineraljzcdbyorc-bcaringgroundwater.IMajorProoIsofOre-BearingGroundwatcrMincralisationTherearcmanyproofiofgro

简介：TheXishaBlockisaminoroneintheSouthChinaSeaandanimportanttectonicunitinthenorthwesternpartoftheregion.ZirconSHRIMPU-PbagesforthreevolcanicintrusivecoresamplesfromXike-1,anexploratorywellpenetratingthebiohermsoftheXishaIslands.ThecoresamplesarefromtheMiocenereefcarbonatebedrockandarerecognizedasdark-graybiotite-hornblendegabbro,grayfne-grainedbiotitediorite,andgrayfine-grainedgranite,respectively.Zirconcathodoluminescence(CL)imagesandtraceTh,UandPbcompositionsofthezirconsshowthattheserocksareofvolcanicintrusiveorigin.ZirconSHRIMPU-Pbdatingyieldedsixgroupsofages,rangingfrom2451-1857MatoearlyCretaceous,whichindicatethattheformationandevolutionoftheXishaBlockwasaffectedbytheevolutionandclosureofNeotethysOcean,probablywithinitseasternextensionintoSouthChinaSea.Bothold,deepsourcedmaterial,includingfragmentsfromRodinasupercontinent,andrecentmantle-derivedmagmaproductscontributedtotheemergenceandformationoftheXishablock.TheSHRIMPU-PbresultsalsoprovedthatthisprocessdifferedfromthatoftheKontummassif,theHainanBlock,andtheSouthChinaBlock,butissimilartothatoftheNanshaandZhongshablocks.TheprocesswasassociatedwiththeeffectsofYanshanianmagmatisminducedbysubductionmechanismsofthePaleo-PacificPlateorthereworkingofthemultiplemagmatismssincetheEarlytomid-Yanshanian,possiblyjointlyexperiencedbytheXisha-Zhongsha-NanshaBlock.

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简介：ObjectiveThepotassicandultrapotassicrocksrelatingtotheIndia-EurasiacollisionandcontinualplateconvergencearewidelydistributedintheLhasaterrane.TheserocksareveryimportanttounderstandthedeepprocessesoftheIndia-EurasiacollisionandtheupliftandevolutionoftheTibetanPlateau.Althoughhigh-potassicvolcanicrocksarealsoexposedinthewesternLhasaterrane,theirformation