简介：Thepaperdealswiththegeologicalsetting,historyandsubsidenceoftheVenetianPlain.MajorattentionispaidtothePleistocene-HolocenestratigraphicsequenceintheLagoonofVenice,inrelationtoitsoriginthatdatesbackto6-7kyrBP.Geologicallandsubsidence,whichplayedanimportantroleintheoriginandtheevolutionofthelagoon,andanthropogenicsubsidence,thathasrecentlyassumedamajorimportancefortheVenetianenvironment,arediscussed.Consideringalsothesealevelrise,23cmlossinlandelevationhasoccurredinthelastcentury,leadingtoincreasedfloodingeventsandenvironmentalproblemsthatrequireprotectiveworks.

简介：About26sedimentarybasinsbearingoilandgasaredevelopedinChina.Theycanbeclassifiedintotwomaintypes,extensionalbasinsandforelandbasins.Theformerarechieflydistributedintheeasternpartandthelatterinthecentralandnorthwesternpartsofthecountry.Thepresentpaperdiscussesthestructuralcharacteristicsofthesebasins,includingsubsidencehistory,thermalhistoryandstructuralstyleandkinematics.Combinedwithtectonicsettinganalysisofgeophysicaldataanderuptiverocks,thegeodynamicsettingofthebasinsisestablished,andtheformationmechanismofthebasinsisdeducedtohavebeenrelatedtothesubductionoftheIzanagiandwestPacificplatesandtheclosingoftheTethysocean.

简介：TheApennine-Maghrebianfold-and-thrustbeltdevel-opedfromthelatestCretaceoustoEarlyPleistoceneatthesubduction-collisionalboundarybetweentheEuro-peanandthewestward-subductedIonianandAdriaplates.LargepartsoftheMesozoicoceaniclithosphereweresubductedduringanAlpinephasefromtheLateCretaceoustoMiddleEocene.Thechaindevelopedthroughthedeformationofmajorpaleogeographicinternaldomains(tectono-sedimentarysequencesoftheLigurian-PiedmontOcean)andexternaldomains(sedi-mentarysequencesderivedfromthedeformationofthecontinentalAdria-AfricanpassivemareinLThecontinu-ityoftheApenninechainisabruptlyinterruptedintheCalabrianArcbytheextensiveklippeofKabylo-Calabriancrystallineexoticterranes,derivedfromdeformationoftheEuropeanpassivemargin.Majorcomplexities(sharpdeflectionsinthearcuateconfigurationofthethrustbelt,out-of-sequencepropagationofthethrusts)arereferredtocontrastingrheologyanddifferentialbuoyancyofthesubductedlithosphere(transitionalfromconti-nentaltooceanic)andconsequentdifferentialroll-backoftheAdriaplatemargin,andtocompetencecontrastsintheMesozoicstratigraphicsequences,wheremultipledécollementhorizonsatdifferentstratigraphiclevelsmayhavefavoredsignificantdifferentialshortening.FromtheLateMiocene,thegeometryofthethrustbeltwasstronglymodifiedbyextensionalfault-ing,volcanicactivity,crustalthinningandformationofoceaniccrustcorrelatedwiththedevelopmentoftheTyrrhenianBasin.

简介：ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐａｌｅｏｃｏｎｔｉｎｅｎｔａｌｍａｒｇｉｎｓ，ｃｈａｒａｃｔｅｒｉｚｅｄｂｙａｃｔｉｖｅｉｎ－ｔｅｒａｃｔｉｏｎｂｅｔｗｅｅｎｅａｒｔｈｃｒｕｓｔａｎｄｍａｎｔｌｅ，ｃｏｍｐｌｉｃａｔｅｄｔｅｃｔｏｎ－ｉｃｍｏｖｅｍｅ...

简介：Asynthesisofcrustalthicknessestimateswasmaderecentlyutilizingavailablefield,geochemical,seismicity,shearwavevelocityandgravitydatainthePhilippines.TheresultsshowthatasignificantportionofthePhilippinearchipelagoisgenerallycharacterizedbycrustwithathicknessofaround25to30kilometers.However,twozones,whicharemadeupofathickercrust(from30to65km)havealsobeendelineated.TheLuzonCentralCordilleraregionischaracterizedbythickcrust.AnotherbeltofthickenedcrustisobservedintheBicol-Negros-Panay-CentralMindanaoregion.ThispaperexaminestheinterplayoftectonicandmagmaticprocessesandtheirroleinmodifyingPhilippinearccrust.Theprocesses,whichcouldaccountfortheobservedcrustalthicknesses,arepresented.Thecontributionsofmagmaticarcsascomparedtothecontributionoftheemplacementandaccretionofophiolitecomplexestocrustalthicknessarealsodiscussed.

简介：ThreeglobalmetallogenicbeltswereformedintheworldduringMesozoicandpost-Mesozoictimes.TwoofthemaresituatedalongthewesternandeasternPacificmargins,andthethirdone-theTethyanEurasianmetallogenicbelt(TEMB)isrelatedtothedomainofEurasianplateandflankedonthesouthbytheAfro-ArabianandIndianplates.ThegeneraltectonicevolutionoftherealmwheretheTEMBwasformediscloselyconnectedwiththehistoryofTethys.Theemplacementoforedepositsandthedevelopmentofregionalmetallogenicunitsarerelatedtoadefinitivetimeintervalandtospecifictectonicsettingssuchas:(1)IntracontinentalriftingalongthenorthernmarginofGondwanaand/orfragmentsalreadyseparated;(2)Oceanicenvironments(i.e.ophiolitecomplexesandoceanfloorsediments)hostpodiformchromitedeposits,volcano-sedimentarycupriferouspyritedeposits(Cyprustype),stratiformmanganesedeposits,andsporadicallyPGEdeposits;(3)Subductionrelatedsettingsinvolvemainlyporphyrycopperdeposits,hydrothermalmassivesulphidepolymetallicdeposits,andepithermaldeposits.SofaridentifiedmineralizationofporphyrycopperexceedsintheTEMBover100milliontonsofcoppermetal;and(4)Collisionandpost-collisioncontinent-continentsettingincludesdepositsoflead-zinc,antimony,gold,insomesectorstindeposits,aswell.ThegiantdepositsofLi-pegmatiteoccursporadically.TheTEMBisalmostacontinuouslymineralizedbelt,butwithinit,somesectorsdisplayspecificfeaturesoftectonicsettings,associationofelements,mineralsandmorphogenetictypesofmineralization.

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简介：云南的广泛的Eshan花岗石由他们的地接触关系区分的三个恼人的单位组成；在下年龄的顺序，他们是Pojiao单位，L吗？？

简介：<正>Chinaisinsevereshortageofpotashreserves,andthebestwayforbreakthroughistomakepotashexplorationinmarinesaltbasins.ErdosbasinissofartheonlyOrdovicianpotashbasinintheworld.TheErdosbasinislocatedwest

简介：Thegeochemistryofsedimentsisprimarilycontrolledbytheirprovenances,anddifferenttectonicsettingshavedistinctiveprovenancecharacteristicsandsedimentaryprocesses.So,itispossibletodiscriminateprovenances,depositionalenvironmentsandtectonicsettingsinthedevelopmentofasedimentarybasinwiththegeochemistryoftheclasticrocks.TheanalyticalresultsofthepresentpaperdemonstratethatsedimentsintheSongliaoprototypebasinareenrichedinsilica(SiO2=66.48-80.51%),andtheirΣREEare30-130timesofthatofchondritewithremarkableEuanomalies.IndiscriminatingdiagramsofEu/Eu*vsΣREEand(La/Yb)NvsΣREE,mostsampleslocateabovethelineEu/Eu*=1,ontherightofthelineEu/Eu*/ΣREE=1andunderthelineLa/Yb)N/ΣREE=1/8,whichindicatesthatthedepositionalenvironmentofsedimentsinthebasinwasoxidizing.Inaddition,variationsofMgO,TiO2,A12O3,FeO+Fe2O3,Na2OandCaOvsSiO2reflectatendencyofincreasingmineralmaturityofsedimentsinthebasin.Analysesalsoshowthattheprotolytesofthesedimentsinthebasinwerefelsicigneousrocks,andtheSongliaoprototypebasinwasinatectonicsettingofanislandarconanactivecontinentalmargin,withviolentsinistralstrike-slip.

简介：ThePhlaythonglargeirondepositinShampasakofsouthernLaos,islocatedintheKonTummicroblock(Fig.1A),central-southernpartoftheIndo-Chinablock,andthegeographiccoordinateofthecentralminingareais14°43′04″Nand106°07′02″E.Intensivetectonicandmagmaticactivitiesofmultipleperiodsdevelopedinthisregion,especiallyinMesozoicandCenozoic,whichareclosely更多还原

简介：

简介：GeochemicalanalysisofsandstonesfromtheSardarFormation(fromtwostratigraphicsuccessions)ineast-centralIranwereusedforidentificationofgeochemicalcharacterizationofsandstones,provenanceandtectonicsetting.Sandstonesinthetwolithostratigraphicsuccessionshavesimilarchemicalcompositionssuggestingacommonprovenance.Bulk-rockgeochemistryanalysisofCarboniferoussandstonesfromSardarFormationindicatesthattheyaremainlyquartzdominatedandareclassifiedasquartzarenites,sublitharenitesandsubarkoses,derivedfromacidigneoustointermediateigneousrocks.DiscriminationfunctionanalysisindicatesthatthesandstonesofSardarFormationwerederivedfromquartzosesedimentaryprovenanceinarecycledorogenicsetting.Also,majorandtraceelementsinsandstonesofSardarFormation(e.g.,K2O/Na2Ovs.SiO2)indicatedepositioninastablepassivecontinentalmargin(PM).Chemicalindexofalteration(CIA)fortheserocks(>65%)suggestsamoderatetorelativelyhighdegreeofweatheringinthesourcearea.

简介：TheEastTianshanisaremoteGobiarealocatedineasternXinjiang,northwesternChina.Inthepastseveralyears,anumberofgold,porphyrycopper,andFe(-Cu)andCu-Ag-Pb-Znskarndepositshavebeendiscoveredthereandareattractingexplorationinterest.TheEastTianshanislocatedbetweentheJunggarblocktothenorthandearlyPaleozoicterranesoftheMiddleTianshantothesouth.ItispartofaHercynianorogenwiththreedistinctE-W-trendingtectonicbelts:theDevonian-EarlyCarboniferousTousuquan-DananhuislandarconthenorthandtheCarboniferousAqishan-Yamansuriftbasintothesouth,whichareseparatedbyrocksoftheKanggurtagshearzone.Theporphyrydeposits,datedat322Ma,arerelatedtothelateevolutionarystagesofasubduction-relatedoceanicorcontinentalmarginarc.Incontrast,theskarn,gold,andmagmaticNi-Cudepositsareassociatedwithpost-colli-sionaltectonicsatca.290-270Ma.TheseLateCarboniferous-EarlyPermiandepositsareassociatedwithlarge-scaleemplacementanderuptionofmagmaspossiblycausedbylithospheredelaminationandriftingwithintheEastTianshan.

简介：在印度次洲的中央印度构造地区(CITZ)的更低的外壳的地震出现用magnetotelluric(MT)被调查数据。MT越过CITZ当模特儿，包括越过1938Satpura更低的外壳的地震震中的新抵抗力模型，表演低抵抗(<80Ωm)中间降低外壳并且推断小体积(<1vol%)在更低的外壳的大多数部分存在的水的液体。这与捕虏体和另外的地球物理的数据支持一起，占优势的brittle/semi-brittle降低外壳的流变学。然而，有被印射的2.2%-6.5%的更高的液体内容的本地深外壳的地区暗示高毛孔压力条件。上面的观察和在这个区域的重要种类率在更低的外壳中为易碎的失败提供有利条件(强壮/中等的岩石力量，中等温度，高毛孔压力和高种类率)。在中间降低外壳中的充满液体的衣袋可能由充当本地应力(液体压力)的来源催化地震产生，这能被推断，和地区性的压力，生产批评seismogenic应力调节它。或者，液体减少岩石的shear力量赞成能被转移到seismogenic差错触发地震的构造压力集中。

简介：

简介：在Zagros低岬盆扔在期间的Asmari形成渐新世中新世。Lithologically，Asmari形成由石灰石，含白云石的石灰石，白云石，陶土的石灰石，某硬石膏(Kalhur成员)和沙岩(阿瓦十成员)组成。这研究在Dezful湾状之物subzone在Marun油矿从四表面下的节(井Mn-68，Mn-281，Mn-292和Mn-312)基于核心样品的分析以便推断他们的起源和阿瓦十沙岩成员的构造背景。Petrographical数据表明阿瓦十沙岩包括97.5%石英，1.6%长石，和0.9%岩石碎片和所有样品作为石英arenites被分类。起源和阿瓦十沙岩的构造背景用综合petrographic被估计了，geochemical学习。

简介：在Trans北方中国造山带的中间的片断定位了，FupingComplex在理解北方ChinaCraton(NCC)的进化历史被看作一个批评区域。建筑群由各种各样的高级、多样地使变形的岩石组成，包括灰色的片麻岩，基本granulite，角闪岩，有细密纹理的片麻岩和大理石，变形了到上面的角闪岩或granulite外形。它能被划分成四个岩石单位：FupingTTG片麻岩，Longquanguanaugen，Wanzi在上crustals，和Nanying花岗石的片麻岩。从FupingComplex的Wanzi在上crustals的大约200由岩屑形成的锆石的U-Pb年龄和Hfisotope作文被分析了。边界给的变形锆石上的数据1.82-1.84Ga变老，相应于NCC的最后的合并事件为在～2.10和～2.51Ga的火的锆石核心产量二年龄人口的数据，与在第2.5a2.9Ga之间散布的一些继承年龄。这些结果建议Wanzi在上crustals从FupingTTGgneisses(～2.5Ga)和Nanying花岗石的片麻岩(2.0-2.1Ga)被导出并且在2.10and1.84Ga之间扔了。有～2.51Ga年龄的所有锆石有起始的ε_(Hf)从+1.4珍视到+10.9的positive，建议在通过从披风的少年材料的增加的～2.5Ga的一个重要外壳的生长事件。为由岩屑形成的锆石的Hf同位素数据进一步暗示2.8Ga岩石是在下地壳的重要部件，它与从为东方块的Nd同位素数据的一个建议一致。2.10Ga人口的锆石有起始的ε_(Hf)-4.9to+6.1的价值，作为在2.1Ga.These结果与次要的少年材料贡献外壳的再融化混合解释了为西方的块从那是不同的，支持Fuping建筑群是在在东方块的西方的边缘的构造活跃环境的emplaced。