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简介：Onthebasisofproposingtheexistenceofakarstcarboncycleandcarbonsinkatawatershedscale,thispaperprovidesfourpiecesofevidencefor;theintegrationofgeologyandecologyduringthecarboncycleprocessesmthekarstdynamicsystem,andestxmatedthekarstcarbonsinkeffectusingthemethodsofcomparativemonitoringofpairedwatershedsandthecarbonstableisotopetracertechnique.TheresultsofthesoilcarboncycleinMaocun,Guilin,showedthatthesoilcarboncycleinthekarstarea,theweatheringanddissolutionofcarbonaterocksunderthesoil,resultedinalowersoilrespirationof25%inthekarstoareathaninanon-karstarea(sandstoneandshale),andthecarbonisotoperesultsindicatedthat13.46%oftheheavycarbonofthehmestoneisinvolvedinthesoilcarboncycle.Thecomparativemonitoringresultsmpaxredwatersheds,suggestingthattheHCO3concentrationmakarstspringis10timesthatofarivuletinanon-karstarea,whiletheconcentrationofinorganiccarbonfluxis23.8times.Withbothchemicalstoichiometryandcarbonstableisotopes,theproportionofcarboninkarstspringsderivedfromcarbonaterockswasfoundtobe58.52%and37.65%respectively.Thecomparisononcarbonexchangeandisotopesatthewater-gasinterfacebetweenthegraniteandcarbonaterockbasinsintheLiRivershowedthattheCO2emissionofthekarstwateris10.92timesthatoftheallogenicwaterfromthenon-karstarea,whilethecarbonisotopeofHCO3^-inkarstwaterislighterby8.62%.However,thisdoesnotmeanthatthekarstwaterbodyhasalargercarbonsourceeffect.Onthecontrary,itmeansthekarstwaterbodyhasagreaterkarstcarbonsinkeffect.WhenthekarstsubterraneanstreaminZhaidi,Guilin,isexposedatthesurface,carbon-richkarstwaterstimulatedthegrowthofaquaticplants.Thevaluesofcarbonstableisotopesinthesamespeciesofsubmergedplantsgraduallybecomesheavierandheavier,andthe512mflowprocesshasamaximumrangeof15.46%.Thecalculationresultsshowe

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简介：Thefocusofthisyear'sconferenceisGlobalExtremeEvents,characterizedaslarge-scaleclimaticeffectsthathavebeenincreasinginmagnitudeandfrequency.Prof.SinyanShen,ChairmanoftheGWInternationalProgramCommittee,hasbeenleadingtheworldonGlobalExtremeEventsandEmergencyResponse.InthelongtermclimatechangewillcausetheEarthtotransittoanotherequilibriumstatethroughmanyoscillationsinclimaticpattern.Globalwarmingcausesextremeeventsandbadweatherinthenearterm.Theimmediate

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简介：Inthegeoscientificcommunityoftheworld,avarietyofproposalsareknownashypothesestoex-plainthedynamicsofthecarth.Theseincludeplatcteetonics,theundationhyPothesis(vanBemmelen,1933),themodernexpanding-earthhypothesis(Carey,S.W.,1976),theupheavalocean-floorhypothesis(Hoshino,M.,1975),theoceanizationhypothe

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简介：TwoGSSPs(GlobalStandardStratotypeSectionandPoint)fortheOrdovicianSystemwerededicatedinSwedenon25&26May2003.TheceremonieswerewellorganizedandwellattendedandincludednotonlytheunveilingofformalplaquesdescribingtheGSSPsbutalsothedrivingof“goldenspikes”.

简介：对从中国大陆人和邻近的块的白垩纪paleomagnetic数据寒武纪用原则被收集获得可靠、高精确的paleomagnetic数据并且注意paleobiogeography和构造进化的协作的类似。中国大陆人块在建议全球paleocontinents的重建上被贮藏与几乎一样的规模。因此，包括中国大陆人块，全球大陆在赤道的南部的方面上沿着纬度变化在期间，这能清楚地被认出早古生代。在古生代的、中国大陆人，块仍然在Laurentia，西伯利亚和Gondwana盘子之中位于，跟随向北的西伯利亚板的快移动，在在Laurentia和Gondwana盘子的西方的部分的一个纵贯的方向的合并，和Iapetus和Rheic海洋是subducted，最后形成一致Pangea在晚古生代。东方Gondwana的澳大利亚、印度的盘子向南逐渐地移动了并且分散，继续扩大Paleo-Tethys海洋。中国大陆人和邻近的块仍然位于Paleo-Tethys海洋，保存了分散的地位，逐渐地向北移动，沿着northsouth取向变化直到的出现特征二叠。另外，一系列本地碰撞发生了在期间三叠纪，并且因而，大多数中国大陆人块被混合进Pangea，除了Gangdise和喜玛拉雅的块。有在侏罗记的东方亚洲大陆的逆时针方向的旋转，向北，在在白垩纪期间改变度的中国大陆的移植，而是喜玛拉雅、印度的盘子没在这个时期期间碰撞进中国大陆。

简介：ThispaperprovidesasyntheticreviewofresearchesonMeishanSectionD,theGlobalStratotypeSectionandPointofthePermian-TriassicBoundary(PTB).Thehistoryofresearch,geographicandgeologicalsettingofthesectionarebrieflyintroduced.Changhsingianto'Griesbachian'conodontandammonoidzonations,themostperfectPermo-Triassiczonationsovertheworld,arepresented,withashortdiscussionontheageofOtoceras.TheChanghsingianto'Griesbachian'strataaresubdividedintothree3rdordersequences,andthesedimentarystructureofeachsequenceisindicated.ThepaperpresentsacorrelationoftheChanghsingianto'Griesbachian'magnetostratigraphyoftheMeishansectionwiththegeneralscale,andinformedthenegationofashortmagneticreversalatthePTBsuggestedbyZhuandLiu(1999).Recentdevelopmentsofchemostratigraphyofδ13Candδ34Sareintroduced,especiallythediscoveryofmorethanonenegativeδ13CexcursionsacrossthePTB.Twoimportantmolecularresearchesrevealtheprofoundchangesatthebaseofeco-system,themicrobialcatastrophy,andtheeuxinicconditionsinthephoticzoneduringthePermian-Triassicsuperanoxicevent.ThepaperreportsthechangesindatingtheageofPTBsince2001.Accordingtorecentachievements,theageofvolcanogenicclaybed25,14cmbelowthePTB,isnowsetat252.4±0.3Ma.Adiscussionontheeventostratigraphyconcludesthat,althoughthereisamajoreventepisodeatbeds25-26,theeventsacrossthePTBatMeishanaremulti-episodicandcommencedpriortotheEventBeds25-26,thusthepossibilitythatthemassextinctionwasmainlyinducedbyanexterrestrialimpactislargelyexcluded.

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简介：TheDachangtin-polymetallicorefieldinnorthernGuangxi,China,liesinamid-latePaleozoicriftthatbordersupthesouthernboundaryoftheJiangnan-XuefengMassif.Asagiantoredeposit,itdepositedinmiddleoftheNandang-Hechimetallogeniczone.TheorehostingstrataareoftheDevonion,whichshowstheevidentcharacteristicsofpolymetallicelements,i.e:,Sn,Zn,Pb,Sb,As,Cu,Ag,In,Ge,Cd,etal.,andover1000000ttinreserves.

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