简介：从在尼日利亚的南部的Benue马槽的三岩石层位学的继任的沙岩的Geochemical研究为沙岩的geochemical描述被承担，并且估计他们的stratigraphic和来源进化。主修，痕量元素数据从露头沙岩样品被获得。SiO2/Al2O3,Fe2O3/K2O比率和CaO内容被用来描绘白垩纪沙岩进Al富有、高、低的Fe2O3/K2O比率沙岩。结果显示有geochemical特征，从Asu河组，越过继任显示stratigraphic趋势Eze-Aku组到可以从不同来源地面暗示不连续的进化的proto尼日尔三角洲继任前寒武纪并且供应了沉积的中生代年龄。Asu河组沙岩有更低的SiO2,艾尔2O3,Fe2O3和更高的MgO；当proto尼日尔三角洲沙岩有更高的SiO2,艾尔22,CaO，碱和更低的MgO>O3,Fe2O3和更低的碱和CaO。这些断绝意味着在白垩纪时间期间影响了南部的Benue马槽的构造推动的影响。在TiO2/Al2O3,Fe2O3,Cr和Zr建议一逐渐地对有时间的depositional盆的mafic贡献。有时间的改变增加的化学索引，可能建议在内地的更强烈的捱过政体与时间发展了。

简介：三个白垩纪岩石层位学的沙岩单位的Petrographic和geochemical分析被承担抑制他们的起源和构造背景。Petrographic分析证明在在三沙岩身体之间的作文有差别，它能在起源地势，运输距离和地面的地质学被归因于差别。在古地台内部领域以内的三岩石层位学的沙岩身体下降的作文。框架模式和化学特征从玄武岩的volcanics显示了他们的推导，源岩在早rifting期间火的源岩在东南地下室建筑群地面定位了的舞台，和felsic，中介和mafic，与次要的沉积部件从高举并且合拢了更旧的白垩纪阶层。沙岩的化学成分主要与源岩，化学捱过条件和运输代理人有关。源岩主要从尼日利亚的东南的前寒武纪的地下室被导出。通过沙岩的检查，构造背景被建模。Benue马槽属于被动边缘的沉积的盆打的一个大陆人。到马槽的Maastrichtain的从Albian的构造进化被贡献在框架模式和沙岩的化学成分的差别。盆的进化以沙岩岩石学和地球化学被重建。构造进化能从岩石学和地球化学数据被细分进三个阶段。第一个阶段盖住Albian；第二上演Turonian-Coniacian，并且第三上演Campanian-Maastrichtain。这些是在在这三个阶段之中的沙岩作文的三大断绝。这三断绝意味着tectonism的影响。

简介：Thebehaviouroftherare-earthelements(REE)duringtheweatheringofgraniteswasstudiedinsouthernGuangxi,China.Basedonthestudyoftheweatheringprofiles,thesoil,weatheredandsub-weaterebzonesareidentifiedwithdifferentREEgeochemicalbehavioursthrougtheweatheringprofilesofgranite.TheCeanomaliesoftheweatheringprofilescoveralargerangeofvalueswithmostfallingbetween1.02and1.43inthesoilzoneand0.16and0.40intheweatheredandsub-weatheredzones.Lightrare-earthelements(LREE)andheavyrare-earthelements(HREE)areenrichedtovaryingdegreeintheweatheringprofilesascomparedtohostgranites.Inthesoilzone,moreHREEsareleachedthanLREEs,andHREEsaremoreenrichedthanLREEintheweatheredandsub-weatheredzones.ItisconsideredthatinfiltrationandadsorptiononclaysaretwoprocessescontrollingtheenrichmentandformationofREEdepositsintheweatheringprofilesofgranite.

简介：

简介：CenozoicadakiticrocksintheGangdesechan-gedfrombarrencontinentalmeltstoore-formingslabmeltsat-23Ma.Thedistributionandchemicalcharac-teristicsoftheore-formingadakitespointtoanassociationwiththeNinetyeastRidge.Thesubductionofthethick,rigidNinetyeastRidgechangedthegeometryandrheologyoftheeasternTibetanPlateaulithosphereandastheno-sphere,restrainedtheeastwardescapeofasthenosphericmantleaswellascontinentalfragments,andpromotedtheupliftandbuildingoftheTibetanPlateau,whichconse-quentlychangedthetectonicandclimaticregimesineasternAsia.

简介：GlobalabruptclimatechangefromMarinoansnowballEarthtogreenhouseEarth,recordedascapcar-bonateoverlainondiamictite,hadshedthefirstlightonCambrianbio-radiation.Themostdocumentedcapcar-bonatesectionsaretypicalwithcomprehensiveδ13Cneg-ativevaluesandubiquitoussedimentarystructures,suchastepee-like,sheet-cracketc.,whichareassociatedwithsuccessiveglacialeustaticvariationcausedbyisostaticreboundinshallow-waterfacies.Herewereportadeep-waterbasinalcapcarbonatesectionwithstrongnegativeδ13CvaluesinthesouthernmarginoftheQinlingOrogen,Heyu,ChengkouCounty,ChongqinginChina,whichconsistsofmassivedolostonewithabundantcarbonaceouslaminae.However,itlacksthesedimentarystructureasmentionedaboveandisoverlainbythin-beddedsiliciousshalesandcherts.AK-bentonitebedwasdiscoveredwithinthebaseofcapcarbonates,about0.7mabovethetopoftheMarinoandiamictite.Magmaticzirconsthatweresep-aratedfromtheK-bentonitebedyieldaSIMSconcordiaU-Pbageof634.14-1.9Ma（lσ,MSWDcE=0.31,ProbabilityCE=1.000,n-=20）.TheageisingoodagreementwithpreviouslyreportedTIMSU-PbagesfortheterminationofMarinoanglaciationandprovidesageochronologicalconstraintfortheEdiacaransuccessionsintheQinlingOrogen.

简介：

简介：这篇论文重新描述奥陶纪前(Pt_3)的特征在从方面ofpetrographic特征，岩石集合，石油化学，REE，痕量元素，铅同位素和大地构造的背景的云南省的Huimin-Manlai区域的变形火山岩。变形火山岩维持blasto-intergranularandblasto-andesitic质地；火山岩被basalt-andesite-daciteassemblage描绘；火山岩是在化学成分的basic-intermediate-intermediate-acid，属于半碱的岩石，与计算碱的系列并且拉斑玄武岩系列共存，并且他们被低TiO_2内容描绘；他们的REE分发模式theLREE丰富是使权利倾向的类型；火山岩在大阳离子元素被充实并且通常在Th充实并且部分在Ti，Cr和P弄空，属于从他们的Pb同位素组成看了的Gondwana类型；石油化学地，数据点主要在岛弧火山岩的地以内掉落。所有这些特征在学习的区域为原来的Tethysan岛弧火山岩的存在提供了新证据。

简介：

简介：UltrabasicrocksintheMianxian-LueyangophioliticmelangezoneincludeharzburgiteanddunitewhichexhibitLREEdepletionwithremarkablepositiveEuanomaly.ThediabasedikeswarmshowsLREEenrichmentbutslightlynegativeEuanomaly.MetamorphosedvolcanicrockscanbedividedintotwogroupsintermsoftheirREEgeochemistryandtraceelementratiosofTi/V,Th/Ta,Th/YbandTa/Yb.OneisthsMORB-typebasaltwithLREEdepletion,representingthefragmentsofoceaniccrustandimplyinganassociationoftheMORB-typeophioliteandanancientoceanbasinbetweentheQinlingandYangtzeplatesduringtheMiddlePaleozoic-EarlyMesozoicera.Theotercomprisestheisland-arcvolcanicrocksincludingtholeiiticbasaltandalargeamountofcalc-alkalineintermediate-acicvolcanicrock,whichcouldnotbethecomponentoftheancientoceaniccrustbuttheresultofmagmatismatthecontinentalmargin.ThisindicatesthattheMianxian-Lueyanglimitedoceanbasinhadundergoneawholeprocessofdevelopment,evolutionandvanishingfromDevonian-CretaceoustoPermian.AndtheQinlingareahadbeconeanindependentlithosphericmicroplate,onthesouthernsideofwhichtherewereexhibitedthetectoniccharacteristicsofactivecontinentalmarginsduringtheLatePaleozoic-EarlyMesozoic.Thatistosay.theQinlingcannotbesimplyconsideredasaresultofcollisionbetweentheYangtzeandNorthChinaplates.

简介：Terrestrialfaultedlacustrinebasinisconsideredasafavorableplaceforthedevelopmentofsourcerocks,especiallythefaultbasinsineasternChina.BasedonmolecularcompositionstudyofsaturatedandaromatichydrocarbonsintheextractsofsourcerocksoftheYingchengandShaheziformationsintheLishuFaultDepression,itisrevealedthattheextractsofsourcerocksareprovidedwithlowratioofPr/Ph,lowcontentofC24tetracyclicterpanes,highcontentoftricyclicterpanesandgammacerane,relativelyhighcontentofC27steranesinthesagbeltanditsperiphery;relativelyhighratioofPr/Ph,relativelyhighcontentoftetracyclicterpanesandgammacerane,lowcontentofC27steranesandobviousadvantagesofC29steranesinitsgentleslopebelt;withhighratioofPr/Ph,highcontentofC19,C20tricyclicandC24tetracyclicterpanes,verylowcontentofgammaceraneandC27steranes,andhighcontentofC29steranesintheedgeoffaultdepression.Accordingtotheorganicmatterinputandsedimentaryenvironment,threetypesofsourcerockshavebeenestablished,which,respectively,arethemodeofmixingorganicmatterinputindeepandsemi-deeplake,theadvantageofterrigenousinputinshallowlakeandterrigenousinputinshore-shallowlacustrine.Thefirstmodeissupposedtogenerateoilandgas,whilethesecondonetendstogenerateoil.ThedistributioncharacteristicsofoilandgasintheLishuFaultDepressionareverylikelytobecontrolledbyhydrocarbongeneratingcharacteristicofdifferentsourcerocktypes.

简介：SomeAudepositsinsouthernAnhuiProvincehaverecentlybeenfoundtobecloselyassociatedwithLateMesozoicintrusions.TypicalexamplesincludetheHua-shahAu（Sb）depositandAudepositsatZhaojialing,Wuxi,andLiaojia.InordertounderstandthemechanismsthatledtheformationoftheseAudeposits,wemakedetailedreviewsonthegeologicalcharacteristicsoftheseAudeposits.Specifically,wepresentnewLA-ICP-MSzirconU-Pbdating,alongwithelementalandHfisotopicdatafromtheHuashanAu（Sb）deposit.OurdatasuggeststhattheHuashanore-relatedintrusionswereemplacedduringtheLateJurassicandEarlyCretaceousperiods（144-148Ma）.Theyarecharacterizedbyarc-magmafea-turesandhighoxygenfugacityandarerichininheritedzircons.ZirconU-PbagesandLu-HfisotopesfromintrusionssuggestthatProterozoicjuvenilelithosphereisthemainsourceoftheseintrusions.TheregionalgeologicalhistoryimpliesthatlithospherebeneathsouthernAnhuiwasproducedduringaProterozoicsubductionandwasfertilizedwithAu（Cu）intheprocess.Integratedwiththeresultsofpreviousstudies,weinferredthatLateMesozoicintrusionsformedbytheremeltingofthelithospherecouldprovidethemetalendowmentfortheAu-richdepositsinsouthernAnhui.

简介：TheYushugouterrainofhigh-pressuregranulitefaciesinsouthernTianshanMountainiscomposedmainlyofanophiolitesuite.Mostselectedziroconsareroundorellipticalinshape,andsomeareoftetragonalprismwithroundedges.Thegranulometricanalysesshowthattheyarewellsortedinsedimentation.ZrO2/HfO2ratiosinzirconsrangefrom45to57.thesecharacters,togetherwiththepetrologicandgeochemicalcharactersofplagioclase-garnet-orthopyroxenitebearingzircons,indicatethattheprotolithofplagioclase-garnet-orthopyroxenitemaybederivedmainlyfromvolcanicbasesurgesedimentarydebrisinoceanicislandsandfromclaysformedbyseafloorweathering.Zirconsaresimplyofpyroclasticdebris.Theophioliteformationageof(440±18)Maandthefirst-stagemetamorphicage(amphiboliteorgranulitefacies)of(364±5)Mawereobtainedwithamethodofmultiplegrainsindifferentgroupsandamethodofconcordiaplot.TheseagesprovideimportantinformationonthetemporalandspatialoccurrenceofsouthernPaleoxoicTianshanOcean,Thesubductionrateoftheoceaniccrustandtheformationmechanismofophioliteofgranulitefacies.

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：根据地质并且geochemical学习包括体积岩石的化学分析，稀土元素并且痕量元素研究，液包体，和S和Oisotopic分析，作者详细描述了存款的地质的背景并且为Shaxi斑岩铜黄金存款的形成的条件介绍了重要证明。与在中国和邻近的Cu-Au的另外的大、晚饭大的斑岩铜矿床相比，使矿物化的区域，形成矿石的过程和条件被分析；并且在Shaxi区域形成大斑岩铜矿床的可能性被讨论。现在的学习显示形成矿石的液体和材料主要具有magmatic起源，当天落水在形成矿石的过程起了某个作用时。自从侏罗记，在潜水艇ducting和制服的盘子之间的相互作用在华东为火成岩和金属元素的免职的形成提供了一个主要驱动力。基于Shaxiintrusive的geochemical数据，铜(黄金)矿化作用是，这被发现仔细与在Shaxi区域恼人的象adakite一样的开始有关。这象adakite一样intrusive向华东大陆由于西方太平洋板的俯冲在俯冲环境被形成，在有形成一张大斑岩铜矿床的一个大潜力的地方。