简介：

简介：在地球旋转和1975Haicheng，辽宁Ms7.3地震，2008Wenchuan，四川Ms8.0地震和2004苏门答腊Msg之间的关系。在他们以前发生在震中区域附近的0地震，以及中等小的地震在这研究被调查。获得的结果能有益于在地球旋转和地震之间的关系的进一步的理解。

简介：

简介：Forthefirsttime,wepresenttherareearthelement(REE)andsulfurisotopiccompositionofhydrothermalprecipitatesrecoveredfromtheTangyinhydrothermalfield(THF),OkinawaTroughatawaterdepthof1206m.Thenaturalsulfursamplesexhibitthelowest∑REEconcentrations(∑REE=0.65×10^-6-4.580×10^-6)followedbymetalsulfides(∑REE=1.71×10^-6-11.63×10^-6).Bycontrast,thenaturalsulfur-sedimentsampleshavemaximum∑REEconcentrations(∑REE=11.54×10^-6-33.06×10^-6),significantlylowerthanthoseofthevolcanicandsedimentsamples.Nevertheless,theδEu,δCe,(La/Yb)N,La/Sm,(Gd/Yb)Nandnormalizedpatternsofthenaturalsulfurandmetalsulfideshowthemostsimilaritytothesediment.MosthydrothermalprecipitatesamplesarecharacterizedbyenrichmentsofLREE(LREE/HREE=10.09-24.53)aridslightlynegativeEuanomaliesornoanomaly(δEu=0.48-0.99),whicharedifferentfromthehydrothermalfluidfromsediment-freemid-oceanicridgesandback-arebasins,butidenticaltothesulfidesfromtheJadehydrothermalfield.Thelowertemperatureandmoreoxidizingconditionsproducedbythemixingbetweenseawaterandhydrothermalfluidsfurtherattenuatetheleachingabilityofhydrothermalfluid,inducinglowerREEconcentrationsfornaturalsulfurcomparedwithmetalsulfide;meanwhile,thenegativeEuanomalyisalsoweakenedoralmostabsent.Thesulfurisotopiccompositionsofthenaturalsulfur(δ^34S=3.20‰-5.01‰,mean4.23‰)andmetalsulfidesamples(δ34S=0.82‰-0.89‰,mean0.85‰)revealthatthesulfurofthechimneyissourcedfrommagmaticdegassing.

简介：REEmobilityduringhydrothermalore-formingprocesseshasbeenextensivelyinvesti-gatedinrecentyearsandthepotentialofREEtoprovideinformationaboutoreformingprocesseshascommonlybeenrecognized.TheDongpinggolddeposit,whichislocatedinnorthwesternHebeiProvince,China,occurringintheinnercontactzoneoftheShuiquangousyenitecomplex,isspatially,andprobablygenetically,relatedtothesyenite.Thedepositwasformedunderthemoderatetohightemperature(220℃to320℃),weaklyacidictoweaklyalkaline,ratherhighfo2(lgfo2=-30～-34)environment.TheREEstudyofthehostrocks,alteredwallrocks,oresandganguemineralsfromthedepositsuggeststhattheREEshavebeenmobilizedanddifferentiatedduringK-feldspathizationandsilicification.TheextremelyalteredsyeniteenvelopingauriferousquartzveinshowspositiveCeanomalyandlargerLREE/HREEratiothanthatoftheunalteredsyenite.TheREEconcentrationsandpatternsoftheoresaredeterminedbytheoretypesandmineralassemblages.LREE/HREEratiosintheganguequartzandhydrothermalK-feldsparsarerelativelylow.Themostsignificantobservationisthattheganguequartzshowssig-nificantpositiveEuanomaly,whereasthehydrothermalK-feldsparsshowlesssignificantornopositiveEuanomalyatallrelativetotheprimaryfeldsparintheunalteredsyenite.ItisevidentthattheREEsaremobileduringK-feldspathizationandsilicificationintheoreformingprocess.WeaktomoderateK-feldspathizationcausedREEmobilitywithoutapparentdifferentiationwiththeexceptionofextremeK-feldspathizationandsilicificationwhichresultedinsignificantdepletionofHREEandEuandrelativeenrichmentofCe.TheREE,Y,U,ThandAucontentsofthesyenitedecreaseasthedegreesofK-feldspathizationandsilicificationoftherocksincreasetowardstheauriferousquartzveins.Astheoresweredepositedunderaratheroxidizedenvironment,Ce4+predominatedoverCe3+.Theprecipitationoftheformerinthefor

简介：在这糊REE集中和Sr和从Furong矿石的Bailashui锡矿床的荧石的Nd同位素组成回答的在场的作者，南部的湖南省。结果证明在荧石的REE的全部的数量通常是低的，从有在学习区域的Qitianling花岗石的类似于那些的使球粒状陨石正常化的REE分发模式的0.705～8.785μg/g，与显著否定Eu异例由LREE丰富模式描绘了。荧石在范围以内在Sr同位素组成变化0.70830.7091，价值比在这个区域的主人碳酸盐岩石的那些是比花岗石并且高的那些低的。ɛ荧石的Nd(t)价值在−9.4和+10.3之间变化，两个都揭示那外壳--并且披风来源材料涉及形成矿石的热水的液体。在这张矿床上与以前的研究结合了，Bailashui锡矿床是速度集合并且仔细空间地在这个区域与花岗石的岩浆酌联系。热水的荧石是在热水的液体和海洋的碳酸盐摇的花岗石的magmatic之间的液体/岩石相互作用的产品。而在形成矿石的液体的Sr主要来自热水的液体和海洋的碳酸盐摇的花岗石的magmatic，在形成矿石的液体的REE和F从花岗石被导出，尽管在Sr同位素组成的变化不能被这二结束成员的简单混合物解释。证据证明形成矿石的液体具有外壳披风的混合起源，但是液体可能是，这不完全地一致，这可以被不同来源的液体的不同类的混合引起。

简介：为petrogenetic亲密关系和从Obudu高原的ortho角闪岩的原来的大地构造的背景的一个模型从12件代表性的角闪岩样品的geochemical分析用踪迹和稀土元素的元素的分发模式被测试。辨别阴谋，对平均MORB的不兼容的痕量元素的规范的模式，Ba/Nb的低比率(923)并且Ba/Ta(130327)并且另外的geochemical特征建议protoliths是主导地tholeiiticMORB作文。La/Ta的比率的价值(8.1310.8)，Rb/Sr(0.040.07)，Th/U(主要4.435.43)并且Hf/Ta(2.352.88)进一步显示ortho角闪岩表明电子类型MORB特征。这些特征与实质的海洋地板有关分叉的构造边界背景而非边缘的盆构造背景。这个进化模式看起来被限制进步部分融化和一块单个披风源地的分离结晶控制，不问，然而变化由于本地来源异质。tholeiitic岩浆被热点活动最可能在建设性的板块边缘上产生并且随后由于一个职业人员变窄到在西方非洲人古地台和东方撒哈拉沙漠板之间的海洋盆地由subduction相关的low-Ktholeiitic化学修改了。因此，可能的模型是Obudu高原的角闪岩与充实的海中央地板tholeiites的特征代表ophiolitic套房的A，它在一个颠倒的盘子期间被使变形并且变形打手势在平底锅非洲人orogenic事件在Obudu高原以内包含俯冲和碰撞。

简介：丽江-小金河断裂斜切中国西南“川滇菱块”,走向北东,为一高角度斜滑断裂.与平面遥感影像相比,通过三维影像解译断错地貌有显著的优越性.印度P5卫星数据具备真正2.5m分辨率,在制图方面,像对生成DEM以及制图精度可达1∶25000.本文依据立体像对提取DEM的原理,利用ENVI软件DEMExtraction模块提耿出了丽江-小金河断裂带P5立体像对的DEM.文中利用等高线套合分析法和剖面线法对DEM精度进行评价,结论认为,DEM精度优于1∶5万地形图等高线高程精度,而且与实时动态差分（RTK）测量结果比较一致.文章重点选取了丽江市北东方向干塘子和西南方向南溪盆地两处,将三种高程数据——从P5立体像对提取出的DEM、googleearth影像地形高程和1∶5万矢量地形图等高线生成的DEM,结合GoogleEarth影像做成三维立体影像,较为直观地对三种高程数据进行了有效的对比,结论认为,P5立体像对生成的DEM精度最高.在室内利用高精度三维立体图对丽江-小金河断裂断层地貌进行了解译,经过野外踏勘和探槽验证,证明三维影像解译具有很高的利用价值.

简介：WeperformedasystematictraceandrareearthelementanalysisforthebeddedFe-MncarbonaterocksrelatedtothestratiformAg-Pb-ZnmineralizationintheLengshuikengoredistrict,JiangxiProvince,SouthChina.ThreetypesofFe-Mncarbonatesaredistinguished,namely,themassive,breccia,andveintypes.Bothcarbonateandsilicatefractionsinthesamplesareanalyzedfortheirtraceandrareearthelementconcentrationsusingastepacid-leachingtechnique.OurresultsshowthatthecarbonatefractionsinthemassivetypesampleshavethelowestREEconcentrationsbutpronouncedpositiveEuandYanomalieswithEu/Eu*valuefrom1.3to6.2andY/Hovaluefrom40.1to59.5,andsimilarcharacteristicsarealsoshownforthesilicatefractionsinthemassivetypesamples(Eu/Eu*=1.0–6.7,Y/Ho=20.7–55.1).TheseREEcharacteristicsaresimilartothoseofSedextypemassivesulfidedepositsworldwide,andwesuggestthatthemassivetypeFe-Mncarbonaterockswerelikelyformedfromanexhalativevolcanic-hydrothermalfluidfeedingthedepressionbasinofavolcaniclake.Thehighconcentrationsofredox-sensitiveelementsandratiossuchasU/Th,V/CrandV/(V+Ni)indicateadysoxicenvironmentfortheFe-Mncarbonatedeposition.Incontrast,thebrecciatypeandveintypeFe-Mncarbonatesamplesshowdifferenttraceandrareearthelementfeaturesfromthoseofmassivetypesamples,andtheyaremoresimilartothevolcanicrocksandmagmatic-hydrothermalfluidsintheLengshuikengoredistrictandmayreflectstrongoverprintingfromvolcanicandsub-volcanicmagmatismrelatedtotheporphyrytypemineralizationinthedistrict.

简介：In1997,IGCPProjectNo.410wasestablishedtoappraiseknownrecordsofOrdovicianbiotas,inordertoevaluateoneofthegreatest-everdiversificationsoflifeonEarth,between489and443millionyearsago.Datacollectionandanalysisofbiodiversitywerecoordinatedthroughsevenregionalteams,andaglobal“clade”team.