简介：Terreneuvian时代(541-521妈)也是为在华南的metallogenesis的一个重要时期，作为被Ni瞬间polymetallic层的普遍出现在更深的斜坡盆背景在先前的浅站台边缘和充实V的黑页岩上代表。在这研究，我们测量了Ni瞬间polymetallic层的Re-Osisochron年龄(Songlin，Niuchang，Sancha，Chuanpengwan)，V富有的黑页岩(Bahuang)，和在在贵州和湖南省的基础Niutitang形成的非产金属的黑页岩(Shuidong)，华南。Ni瞬间polymetallic层和充实V的黑页岩有类似的Re-Osisochron年龄，建议产金属的矿石的这二种类型的并发的免职。这个建议与由使用直接作为一个stratigraphic标记位于这些产金属的层下面的榴状的磷钙土床的传统的stratigraphic关联一致。而且，产金属的矿石和非产金属的黑页岩有类似的起始的187Os/1880.8-0.9的O比率，与热水的活动的次要的贡献为主导的海水起源争论。而且，Re-Os同位素的数据也暗示那Ni瞬间和V矿石可能源于一样的来源。我们建议产金属的矿石的空间分发能被non-sulfidicanoxic-suboxic楔(NSASW)的开发在以前的平台边缘在斜坡盆和sulfidic楔解释。深水的Upwelling温和地减少的、器官的富有的NSASW，在V，(V)优先地被归结为V(IV)，并且是由有机金属的复杂形成从海水移开的第一横断。作为结果，V富有的黑页岩在Yangtze站台的斜坡盆扔。进sulfidic站台边缘的深水的进一步的运动导致Ni瞬间polymetallic层形成。

简介：Suoerkuduke()Cu(瞬间)沉积物，在有Xilekuduke的一样的metallogenic带()Cu瞬间沉积物，位于Armantai()东方Junggar的北边缘上的岛弧带，西北中国。七个辉钼矿的同位素的分析从存款取样的金来和锇被用来决定矿化作用的年龄。317.7的七点的isochron年龄

简介：通过对白山斑岩型钼矿床深部钻孔的7件辉钼矿进行Re-Os同位素测年分析,获得辉钼矿模式年龄为（223.5±3.2）Ma~（227.5±3.1）Ma,辉钼矿等时线年龄数据为（223.2±2.7）Ma（MSWD=0.64）,成矿时代为晚三叠世早期。结合对已有年龄资料的归纳和分析认为,白山钼矿的成矿作用与东天山觉罗塔格地区印支期花岗质岩浆活动有关,该矿床测年结果代表了东天山地区印支期一次成矿作用的高峰。

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简介：TheDachangtin-polymetallicdistrict,Guangxi,China,isoneofthelargesttinorefieldsintheworld.Bothcassiterite-sulfideandZn-CuskarnmineralizationarehostedintheMid-UpperDevoniancarbonate-richsedi-mentsadjacenttotheunderlyingCretaceousLongxianggaigranite（91-97Ma）.TheLamoZn-CudepositisatypicalskarndepositinthedistrictandoccursatthecontactzonebetweentheUpperDevonianlimestoneandthegranite.Theoremineralsmainlyconsistofsphalerite,arsenopyrite,pyrrhotite,galena,chalcopyrite,andminormolybdenite.However,theageofmineralizationandsourceofthemetalsarenotwellconstrained.Inthisstudy,weusethemolybdeniteRe-Osdatingmethodandin-situPbisotopesofsulfidesfromtheLamodepositforthefirsttimeinordertodirectlydeterminetheageofmineralizationandthetracingsourceofmetals.SixmolybdenitesamplesyieldedamoreaccurateRe-Osisochronageof90.04-1.1Ma（MSWD--0.72）,whichismuchyoungerthanthereportedgarnetSm-Ndisochronageof95±11MaandquartzfluidinclusionsRb-Srisochronageof99±6Ma.ThisageisalsointerpretedastheageofZn-Cuskarnminer-alizationintheDachangdistrict.Further,inthisstudywefoundthatin-situPbisotopesofsulfidesfromtheLamodepositandfeldsparsinthedistrict＇sbiotitegraniteandgraniticporphyrydikeshaveanarrowrangeandanoverlapofPbisotopiccompositions（206pb/204pb18.417-18.594,207pb/204pb=15.641-15.746,and208pb/204pb=38.791-39.073）,suggestingthatthemetalsweremainlysourcedfromCretaceousgraniticmagma.

简介：Datingofmetallicoredepositshasbeenoneoftheproblemsconcernedwithbyoregeologistsformanyyears.TheestablishmentoftheRe-OsIsotopeLaboratoryattheInstituteofRockandMineralAnalysis,ChineseAcademyofGeologicalSciences,hasprovideduswithanewtechniquetocarryoutgeochronologicalstudiesofmolybdenumores.AsoneofthemostimportantRe-bearingminerals,molybdenitecontainsalmostnocommonosmium,but^187Oswasderivedcompletelyfromdecayof^187Re,with^187OscontentasthefunctionofRecontentinthemineral.AnID-ICP-MStechniquehasbeenusedinthisstudy,andRe-Osisotopicagesofseverallargemolybdenumdepositsofdiffer-enttypesfromtheEastQinlingmolybdenumbelthavebeendetermined.ItisindicatedthattheHuanglongpucarbonatitevein-typemolybdenum-(lead)deposithasaRe-OsagecorrespondingtoIndosinian,whiletherestporphyry-typemolybdenumdepositsandporphyry-skarn-typemolybdenum-(tungsten)depositshaveRe-OsagescorrespondingtoYenshanian.

简介：Themulti-stageintrusionsofintermediate-acidmagmaoccurintheBangpuminingdistrict,thepetrogenicagesofwhichhavebeenidentified.Thetimesandsequencesoftheiremplacementhavebeencollatedandstipulatedindetailinthispaperbyusingthelaserablation-inductivelycoupledplasma-massspectrometry(LA-ICP-MS)zirconU-Pbdatingmethod.Theagesofbiotitemonzogranitethatwereformedbeforemineralizationinthesouthwestofthisminingdistrictare70±1Ma(meansquareofweighteddeviates(MSWD)=9.5,n=8)and60.60±0.31Ma(MSWD=3.8,n=16),whichbelongtothelateCretaceous-earlyPaleoceneinage.Thatmeans,theyareproductsofanearlytectonicmagmaticeventofthecollisionbetweentheIndianandAsiancontinentals.Theagesofore-bearingmonzograniteporphyryandore-bearingdioriteporphyriteare16.23±0.19Ma(MSWD=2.0,n=26)and15.16±0.09Ma(MSWD=3.9,n=5)separately,whichbelongtothemiddleMioceneinage;namely,theyareproductsoftheGangdesepost-collisionextensionalstagewhencrust-mantlematerialsmeltedandmixedaswellasmagmaticintrusionsimultaneouslyoccurred.Somezirconswithagesof203.6±2.2Ma(MSWD=1.18,n=7)werecapturedintheore-bearingdioriteporphyrite,whichshowsthattherehadbeentectono-magmaticeventsinthelateTriassic-earlyJurassic.Molybdenum(copper)ore-bodiesproducedinthemonzograniteporphyryandcopper(molybdenum)ore-bodiesproducedinthedioriteporphyritearethemainoretypesinthisoredeposit.ThemodelagesofRe-Osisotopicdatingforthe11molybdeniteare13.97-15.84Ma,whileisochronagesare14.09±0.49Ma(MSWD=26).Theisochronagesofsevenmolybdenitefrommolybdenum(copper)orewithmonzograniteporphyrytypeare14.11±0.31Ma(MSWD=5.2).Thereisgreaterrorintheisochronagesoffourmolybdenitefromcopper(molybdenum)orewithdioriteporphyritetype,andtheirweightedaveragemodelagesof14.6±1.2Ma(MSWD=41),whichgenerallyrepresentthemineralizationage.TheresultsabouttheR

简介：TheDajiuhuwetland,afamoussub-alpinewetlandlocatedinthetheShennongjiaMountains,north-subtropicalregionofCentralChina,hassufferedfromadverseimpactsofunsustainablehumanpracticesoverthepast60years.TheDajiuhuwetlandreflectsthedevelopmentprocessthathasbeenaccompaniedbyhumanactivities.Basedonfieldsurveydata,highresolutionremotesensingimageandhistoricalrecords,thepresentpaperprovidedareviewonexploitationandrestorationofthewetland.TheresultsshowedthattheDajiuhuwetlanddegradedquicklyfrom1950to2005.Duringthattime,bogshrinkage,lakedisappearance,biodiversitydecline,sphagnumreduction,andvegetationsuccessionfromwetlandcommunitiestoterrestrialcommunitiesintheDajiuhuwetland,whichwerethemainmanifestationsofthewetlanddegradation.Humanactivities,suchasagriculturalreclamationandconstructionofdrainageworks,havebeenthemainfactorsresultinginecologicaldegradationofthewetlandsince1986.Povertyandtheshort-termeconomicbenefitshadbeenthedrivingforcesforwetlanddrainageandreclamationoverthepastyears.

简介：在广东省的自动气象站的格子数据，海军的研究实验室的卫星产品，常规气象学的数据和观察的NCEP全球数据吸收系统分析和环境条件被使用，大气的循环，并且在南部的中国诊断热带气旋Higos的增强的原因和机制的物理特征。结果显示出那高温度的有利环境条件，内在的表面的湿度，强壮的上面的分叉，弱垂直的风砍，并且在南部的Higos旁边的一条西南喷气溪流是的persistenceof贡献了紧张的themaintenance和Higos的重新增强的必要成分。从更低的对流层的冷空气的下沉侵入是为它在土地上的增强的批评条件。弱冷空气引起的正面的开始增加了更低的tropospheric集中并且直焰，并且潜伏的热由大雨释放了的冷凝作用支持了集中。从这个积极反馈过程，Higos获得了一增加积极涡度并且在土地上重新加强。重新增强对风和压力而且到它的温暖的核心的同时的热身运动的减小的逐渐增加到期不仅。

简介：　　四川力马河镍矿是峨眉山大火成岩省一个有代表性的岩浆硫化物矿床,岩体主要由辉长-闪长岩及斜长辉石橄榄岩组成.Re-Os同位素分析样品包括非矿化斜长辉石橄榄岩、斑点状(浸染状)、陨铁状(网脉状)矿石及其选纯硫化物、块状硫化物.……

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简介：源于空气包裹扩大/压缩的密度效果的修正在当开路径的系统被使用时，解释水汽和公司2的旋涡协变性流动是重要的。到为这些效果的报道，干空气的密度的吝啬的垂直速度和不安是在对待为密度变化负责的那些物理进程的二个批评参数。基于各种各样的内在的假设，不同研究为干空气的密度的吝啬的垂直速度和不安获得了不同公式，导致很多条途径改正密度效果。在这研究，我们再考与被做到的不同假设有关的物理过程提出密度效果。明确地，我们覆查零干空气流动的假设和在表面层的零湿空气流动，使用为改正密度效果对待密度变化，和他们的含意。在与零干空气流动的假设的关系的物理过程说明对密度变化的干空气扩大/压缩的影响，这被发现。同时，在与零湿空气流动的假设的关系的物理进程说明对密度变化的湿空气扩大/压缩的影响。在这研究，我们另外覆查混合比问题。我们的结果显示零干空气流动的假设相对干空气赞成混合比的使用，当零湿空气流动的假设相对全部的湿空气赞成混合比的使用时。另外，我们为吝啬的垂直速度比较不同公式，由空气包裹扩大/压缩产生了，并且为使用的密度效果修正，旋涡协变性数据测量了超过三个北方的生态系统。

简介：OwingtotheBenjamin-Feirinstability,theStokeswavetrainexperiencesamodulation-demodulationprocess,andpresentsarecurrencecharacteristics.StiassnieandShemerresearchedtheunstableevolutionprocessandprovidedatheoreticalformulationfortherecurrenceperiodin1985onthebasisofthenonlinearcubicSchrdingerequation(NLS).However,NLShaslimitationsonthenarrowbandandtheweaknonlinearity.Therecurrenceperiodisre-investigatedinthispaperbyusingahighlyefficientHighOrderSpectral(HOS)method,whichcanbeappliedforthedirectphaseresolvedsimulationofthenonlinearwavetrainevolution.ItisfoundthattheStiassnieandShemer’sformulashouldbemodifiedinthecaseswithmostunstableinitialconditions,whichisimportantforsuchtopicsasthegenerationmechanismsoffreakwaves.AnewrecurrenceperiodformulaispresentedandsomenewevolutioncharacteristicsoftheStokeswavetrainarealsodiscussedindetails.

简介：本文根据Ｕ－ｐｂ、Ｒｂ－Ｓｒ、４０Ａｒ／３９Ａｒ法测年资料，探讨了川西白玉－稻城地区花岗岩类的东岩带、中岩带、西岩带的形成时代。东带以２００Ｍａ为主，中带以８０Ｍａ为主，西带以２２０Ｍａ为主，各方法所获年龄数据基本上可对比。

简介：电子自旋共振(ESR)年龄测定法是在国外于1975年以后发展起来的一门新的断代技术。测定法的原理是直接测定某矿物晶体的顺磁电子(包括陷井电子和空穴)的数量。这些自由电子是由于样品本身以及环境中存在的放射性元素所产生的α、β、γ射线辐照诱导而成.当矿物的年龄越“老”,顺磁电子的数量也越多,相应于累积的总辐照剂量(TD)就越大。

简介：长城系底界一条十分重要的地质界限,研究其时代具有非常重要的理论意义和实际意义。自高振(?)1934年开始研究,到1939李四光称为标准剖面以来,国内外许多地质学家对其作了大量研究工作。目前该剖面已被确定为“中国北方中、上元古界地层的层型剖面”,因此对该剖面进行同位素地质年代学研究,对确定我国北方长城系底界时代有着举足轻重的意

简介：Icecoreδ18OrecordefromtheNo.aglacierattheheadoftheUrumqiRiverwereusedocharacterizetherelationshipbetweenδ18Oandcontemporaneoussurfaceairtemperature(Ta)nearbytheDaxigouMeteorologicalStation(3539mabovesealevel,-2kmawayfromtheicecoredrillingsite),Althoughtheicecorerecordsofannuallyaveragedδ18Oarepositivelycorrelatedwithconemporaneoussurfaceairtemperature,especiallysummerairtemperature,thecorrelationislesssignificantthanthatfortheprecipitationsamplesduetodepositionalandpost-depositionalmodificationprocesses,However,theClimatologicalsignificanceoftheicecorδ18Orecordscanbestillpreservedtoacertaindegree,whichmoghtextendtheapplicationofhighaltitudeandsub-tropicalicecoreδ18Orecordstopaleoclimatereconstruction.

简介：Thermalmaturationandpetroleumgenerationmodelingofshalesisessentialforsuccessfulexplorationandexploitationofconventionalandunconventionaloilandgasplays.Forbasinwideunconventionalresourceplayssuchmodeling,whenwellcalibratedwithdirectmaturitymeasurementsfromwells,cancharacterizeandlocateproductionsweetspotsforoil,wetgasanddrygas.Thetransformationofkerogentopetroleumisassociatedwithmanychemicalreactions,butmodelstypicallyfocusonfirst-orderreactionswithratesdeterminedbytheArrheniusEquation.AmisconceptionhasbeenperpetuatedformanyyearsthataccuratethermalmaturitymodelingofvitrinitereflectanceusingtheArrheniusEquationandasingleactivationenergy,toderiveatime-temperatureindex(∑TTIARR),asproposedbyWood(1988),isflawed.ThisclaimwasinitiallymadebySweeneyandBurnham(1990)inpromotingtheir'EasyRo'method,andrepeatedbyothers.Thispaperdemonstratesthroughdetailedmulti-dimensionalburialandthermalmodelinganddirectcomparisonofthe∑TTIARRand'EasyRo'methodsthatthisisnotthecase.The∑TTIARRmethodnotonlyprovidesaveryusefulandsensitivematurityindex,itcanreproducethecalculatedvitrinitereflectancevaluesderivedfrommodelsbasedonmultipleactivationenergies(e.g.,'EasyRo').Throughsimpleexpressionsthe∑TTIARRmethodcanalsoprovideoilandgastransformationfactorsthatcanbeflexiblyscaledandcalibratedtomatchtheoil,wetgasanddrygasgenerationwindows.Thisisachievedinamore-computationally-efficient,flexibleandtransparentwaybythe∑TTIARRmethodthanthe'EasyRo'method.Analysisindicatesthatthe'EasyRo'method,usingtwentyactivationenergiesandaconstantfrequencyfactor,generatesreactionratesandtransformationfactorsthatdonotrealisticallymodelobservedkerogenbehaviourandtransformationfactorsovergeologictimescales.

简介：中国地质科学院地质研究所万渝生研究员团队在地质调查项目与国家自然科学基金项目联合资助下，通过精度测年和综合研究，在冀东地区发现大量38—35亿年形成的碎屑锆石，在鞍山地区发现38—31亿年多期岩浆活动，证明鄂尔多斯地块强烈卷入古元古代晚期构造热事件，

简介：TheoccurrencesofassociatedelementsandtheirgeneticfactorsintheNo.30coalseamintheZhijinCoalfieldwerestudiedusinginstrumentalneutronactivationanalysis,inductivelycoupledplasma-atomicemissionspectroscopy,andascanningelectronmicroscopeequippedwithanenergy-dispersiveX-rayanalyzer.And,amicroscopephotometersystem(LeitzMPV-Ⅲ)wasusedtoobservethecharacteristicsofcoalpetrology.Accordingtotheinfluencedegreebythesiliceouslow-temperaturehydrothermalfluids,theorganicmatterisdividedintofourtypes:A,B,C,andDofthehydrothermally-alteredorganicmatter(HAOM).ThestudyshowsthatthehighcontentofFe(2.31%)isnotfrompyrite,butmostlyfromthesiliceouslow-temperaturehydrothermalfluids.Theoccurrencesoftheassociatedelementsinthefourorganicmattertypesaredifferent.ThecontentsofFe,Si,andAlaredecreasing,butSandCuareincreasingintheorderoftheHAOM-A,HAOM-B,HAOM-C,andHAOM-D.Thelosingrateofsulfurinorganicmatteris0.35%andthecontentofFetakenfromthelow-temperaturehydrothermalfluidsintotheorganicmatteris0.794%duringthesiliceouslow-temperaturehydrothermalfluidsinvadingthecoalseam.Theabovefactsindicatethatthelow-temperaturehydrothermalfluidsplayacrucialroleinthere-distributionsandoccurrencesofassociatedelementsincoal.