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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：Themultivariatestatisticalanalysisisprofitablyapplicabletothestudyofconodontmultielementtaxonomy.R-modeclusteranalysesofquantitativeand0-1dataarecarriedoutheretoclassifymorethan6000discreteLowerTriassicconodontspecimensbelongingto108kindsofconodontelementsfromWesternGuangxi.TheresultsofR—modeclusteranalysisrevealmoredirectlytherelationshipamongmanyisolatedconodontelements,andtheyalsoprovethatthere-sultsofthelogicalinferencearebasicallycorrect,i.e.108kindsofconodontelementscanbeidenti-fiedinto32speciesbelongingto11generaofconodonts.TheapplicationofR-modeclusteranalysismultielementtaxonomybythemethod,hasbroughtabout4significantconclusions,whichcanbeusedbyconodontresearchersasreference.

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简介：Onthebasisofexistingconodontdata,theauthorshavestudiedtheLatePermian-EarlyTriassicconodontsofdifferentformsandbiofaciesindetail.Fiveconodontbiofaciesarerecognized,fromshallowtodeepwaters1.Hindeodusconodontbiofacies,2.Pachycladina-Parachirognathusconodontbiofacies,3.Gondolella-Hindeodusconodontbiofacies,4.Gondolella-Neospathodusconodontbiofacies,and5.Xaniognathusconodontbiofacies.Consideringthetemporalandspatialchangesoftheseconodontbiofacies,3conodontbloprovinceshavebeendivided.Inlightofthebiofacieschangesofeachbioprovince,theauthorsalsodiscuss,inthispaper,theregularityoftransgression-regressioncyclesofeasternTethysandtheirpossiblerelationtothemassbioticalternation.

简介：TheTriassicLowerKaramayFormation(T2k1)isoneofthemainoil-bearingstratigraphicunitsinthenorthwesternmarginofJunggarBasin(NWJunggar),China.Basedonanintegratedinvestigationofoutcrops,welllogsandseismicdataofNWJunggar,theLowerKaramayFormationissubdividedinto2sets,6bedsand13layers.Also,itisconsideredthatthealluvialfan,thebraidedriver,themeanderingriverandtheshore-shallowlacustrineweredevelopedduringtheearlyperiodofMiddleTriassicinKaramaydistrictsⅠ,Ⅲ.TheLowerKaramayFormationdepositsthefollowing9sedimentarysubfacies:thelowerfan,themiddlefan,theupperfan,thebraidedchannel,theoverflowbank,theriverfloodofbraidedriver,themeanderingchannel,theriverfloodofmeanderingriver,theshore-shallowlacustrine.Seventeenmicrofaciessuchasthebraidedstreamchannel,thealluvialsandfloodplain,thealluvialglutenitefloodplain,thewaterchannel,thechannelbaretc.havebeenidentifiedinsubfaciesaswell.Thethicknessofstrataisfirstlyup-thinningandthenthickeningupwardtothetop,itisaprocessfromlarge-scalelacustrinetransgressiontopartlylacustrineregression.Furthermore,themicrofaciesplanardistributinglawprovesthattheremainingoilmayenrichalongthemarginofmicrofaciesbecauseoftheplanarmicrofacieschanges.Therefore,thisresearchisbeneficialforsearchingremainingoilinNWJunggarandprovidinginformationtotheproject"TheSecondaryExploration"ofPetroChina.

简介：在在中间之间的过渡时期并且晚三叠纪，印度支那造山运动在华南引起了二构造事件：(1)形成并且沿着华南板的北边缘Qinling-Dabieorogenic带高举，由于它有北方中国板的碰撞；并且2)在华南板的东南的部分的1300-km-wideintra大陆人orogen的发展，它导致了低岬戳褶层地区的一个向西北的运动。这些构造事件结果Yangtze站台的intheending，并且是从Eidacaran的一个稳定的paleogeographic因素到中间的目的三叠纪。这个平台被浅水的碳酸盐的普遍发展描绘。在Yangtze站台的结束以后，上面的Yangtze低岬盆(或四川低岬盆)被形成在期间晚三叠纪并且成为了由Xujiahe形成的相关阶层构成的河的存款的一个累积地点。在西方的四川省，Xujiahe形成躺形成浅水的碳酸盐Xiaotangzi形成siliciclastic岩石摇的Maantang(从架页岩到沿岸的外形)。sequence-stratigraphic框架上面在上面的Yangtze低岬盆三叠纪显示特别冲积体系结构，由创作的序列描绘了(1)高住所的阶段的低精力的河的存款的继任包括煤缝接，并且(2)低住所的阶段的高精力的河的存款，包括混合河隧道沙岩。属于Xujiahe形成和它的相对阶层的这些河的存款的空间分发被渐渐的变瘦外面描绘，重叠，并且向东方和南方的拧外面。这个沉积记录因此在低岬盆的充满的继任以内表示河的存款的特别sequence-stratigraphic继任。sequence-stratigraphic框架为上面在上面的Yangtze区域三叠纪提供Yangtze站台和上面的Yangtze低岬盆的形成的结束的一个记录。

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简介：我们在Daxiakou在二叠三叠纪的边界附近学习了泥土岩石()在Xingshan的节()，湖北()省，中国。所有泥土岩石被illitemontmorillonite(I/M)支配混合层矿物质，和高温度的六角形的bipyramid(HB)石英和黄铁矿在不同丰富被包含。克莱microspheres甚至在一些床上被发现。结果证明尽管爆发的紧张和爆发中心的位置可能在时期期间变化了，那项暴烈的活动在二叠三叠纪的转变期间在这个区域或在附近的区域是很经常的。经常的暴烈的活动应该是至少一个领先的事件在大二叠三叠纪的转变期间引起生物区系和生态系统的重大周转。

简介：最早三叠纪的Yinkeng形成在著名Meishan节被暴露，华南，它为二叠三叠纪的边界(PTB)包含节和点(GSSP)的全球Stratotype。它记录有韵律的引申主要由marlstone和石灰石包括了的厘米规模。在捆的五种类型嵌入的两行诗的七种类型基于lithologic单位的出现和厚度被认出，建议他们的形成被周期的过程控制。观察的周期的各种各样的订单相关很好，另外的早三叠纪的对应物在华南记录了。这里，我们现在的新cyclostratigraphic基于lithologic厚度和Yinkeng形成的相对碳酸盐内容结果。碳酸盐内容的力量系列证明在整个形成认出的主要波长的比率类似于100kyr的短怪癖，33kyr斜，和21kyr领前周期，显示天体的信号在最早三叠纪的有韵律的继任被记录。在从费歇尔阴谋获得的显著lithologicrhythmicity和海平面的变化之间的坚固性显示高周波的气候的周期可能在PTB集体扑灭以后立即驾驶了海平面的变化。而且，从沉积记录解释的海平面的变化与100kyr匹配很好的4th顺序碳酸盐内容的短怪癖部件，思考短导致怪癖的气候改变的100kyr可能多半控制了4th顺序序列的免职，这从有韵律的继任认出了。

简介：ThewesternGangdeseinTibetduringTriassicwaspreviouslyconsideredtobeapartoftheGangdeseOldland(ZhaoZZetal.,2001;Fig.1).IftheGangdeseOldlanddidexist,itmeansnoprospectofpetroleumexplorationoftheTriassicstratainwesternGangdesearea.Fortunately,therecentbiostratigraphicprogressesdon’tsupporttheexistenceoftheGangdeseOldland.ThispaperaimstobrieflyintroducethenewpaleogeographicinterpretationandthereasonthatthewesternGangdeseintheTriassicwasmarineinsteadofterrigenousonthebasisoftherecentconodontdata.

简介：摘要：因为缺乏典型lithological符号和石块标准，在Daxian-Xuanhan区域关于二叠/三叠纪的边界和它的关联有不同意见。特别，它是很难的决定在Daxian-Xuanhan的二叠/三叠纪的边界埋葬了区域。这把许多困难带到地质的研究和油和煤气的探索。基于领域调查和木头分析的井核心，最新发现的石块，lithological特征和井的研究，作者在Daxian-Xuanhan区域讨论了二叠/三叠纪的边界并且向前为它的决心和地区性的关联带了一个特定的计划。

简介：X-raydiffractionmethodsforestimatingthemetamorphicgradeofdiagenetic,anchizoneandepizoneinmetapelitesarereviewedandappliedtosamplesfroma7000m+boreholeinwesternChinaandsurfacesamplesfromthesurroundingZoigêarea.Kübler'sillitecrystallinity(IC)measurementsprovidemoreconsistentresultsthancalculatedvaluesofpercentageofilliteintheI/SmixedlayersandpercentageofI/Smixedlayers.Down-boreholeICvaluesdisplayatypicalburialmetamorphicrelationshipbetweenstratigraphiclevelandIC.Amethodforpreparingverylowgrademetamorphicmapsisdescribed,andisogradsplottedonaregionalgeologicalmapatselectedvaluesofIC,delineatingahightemperaturediageneticzone,ananchizone,andanepizone.ThemapshowsthatICvaluesarecontrolledbystratigraphiclevelinthenorthofthestudyarea(i.e.burialmetamorphism),andproximitytoanigneousintrusivebodyinthesouth(i.e.contactmetamorphism).

简介：在Balochistan的Wulgai村庄附近的玄武岩的暴烈的集团企业发生在是m的Bagh建筑群的专一的沉积岩石单位????吗？？

简介：ThecharacteristicsoftheTriassicsequencesdevelopedintheLowerYangtzeareadisplaysomegreatchangesinbothenvironmentandclimate.Thechangeofenvironmentwasatransitionfrommarinetocontinentviaalternatingenvironments.Thechangeofclimatewasatransitionfromtropic(torrid)towarmandwetclimateviasubtropicdryclimate.Thetypevariationsofthesequenceswerefromthemarinesequencestothecontinentalsequences,correspondingtothechangesofenvironmentsandclimates.Sequence1isatypeⅡofsequenceofmixedclasticandcarbonatesediments;sequence2isatypeⅠofsequenceofcarbonateplatform;sequence3isatypeⅠofsequenceofcarbonatetidalflat-saltlagoon,sequence4isatypeⅡofsequenceoflacustrinewithinmarinelayers,andsequence5isasequenceoflacustrine-swamp.Thedevelopment,distributionandpreservationofthosesequencesrevealthetectoniccontrolsandtheirchangesinthebackground.ThecollisionbetweentheYangtzeplateandtheNorthChinaplatewasagreatgeologicaleventinthegeologicalhistory,butthetimingofthecollisionisstilldisputed.However,thecharacteristicsofTriassicsequencestratigraphyandsealevelchangesintheLowerYangtzearearespondedtothiscoliision.ThecollisionstartedatthebeginningofmiddleTriassicandthegreatregressionintheLowerYangtzeareastarted22Maearlierthanthoseintheworld.Thetectonicconditionsoccurredbeforeandduringthecollisioncontrolledthedevelopmentofsequencesandtypechanges.

简介：LateMiddleTriassictoearlyLateTriassicinsectsfromArgentinahavebeenpreviouslydescribedfromtheBermejoandCuyanaBasinswheretheyhavebeenrecoveredfromtheIschichuca-LosRastrosandPotrerillos-CacheutaFormations,respectively.Theinsectfaunadiscussedhereinwascollectedduringfieldstudiesin1986/1987fromtheLlantenessection(NoriantoRhaetian?LateTriassic),whichissituatedintheMalargueBasininsouthernMendozaprovince.TheinsectremainswerefoundintheupperpartoftheLlantenessection(LlantenesFormation),whichisbuiltupoftwocoarsening-upwardscyclesreflectingadeltaicprogradationofafluvialintoalacustrineenvironment(lowerpart),succeededbyrepeatedprogradationsintoafloodplain-dominatedenvironment(upperpart;withfindsofinsects,conchostracans,fishremains,plantfragments,anddriftedlogs).ThenewfindsrepresenttheyoungestTriassicinsectrecordsdescribedfromArgentinaandevenfromSouthAmericainitsentirety.ThereisonlyonecontemporaneousfossilassemblageinGondwana:intheClarence/MoretonBasin(AberdareConglomerate;LateNorian)inAustralia.ThenewTriassicinsectsincludeanimpressionofanisolatedMecopterida-likewing(Mendozachoristavolkheimerigen.etsp.nov.;Mendozachoristidaefam.nov.),coleopteranelytraofthePermosynidae(Ademosynerosenfeldisp.nov.andAdemosynellantenesensissp.nov.)andotherisolatedbodyfragments.ThisnewLateTriassicentomofaunafromArgentinaisofconsiderableimportanceinthereconstructionofthebioticrecoveryofcontinentalenvironmentsinGondwanaafterthecatastrophicmassextinctionattheP/Tboundary.

简介：ItisanacceptedfactthatthemainsolidphasesupportforpotassiumintheSichuanBasinispolyhalite[K2MgCa2(SO4)4·2H2O]ratherthansylvineis(KCl)(GongDXetal.,2015).Themineraltypes,occurrencecharacteristicsandmetasomatismofthepolyhalitebearingore-bedwereidentifiedandtheoriginofthepolyhalitewasdiscussed.ThepolyhalitesampleswereobtainedfromthecoreofZ12,locatedinDalongVillage,Guang'anCityofcentralSichuan.Thesamplingdepthswere2974m(s-1),3023m(s-2)and3106m(s-3).Themicrobeamanalysisofback-scatteringimageswascarriedoutusingaShimadzuEPMA-1720Serieselectronprobemicro-analyzer,supplementedbyaquantitativespectrumanalysisthatdeterminedthemineraltypes.