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：Ｔｈｒｅｅｆｕｎｄａｍｅｎｔａｌｔｈｅｏｒｉｅｓａｒｅｒａｉｓｅｄｆｏｒ“ｃｏｍｐｌｅｘｉｔｙａｎｄｓｅｌｆ－ｏｒｇａｎｉｚｅｄｃｒｉｔｉｃａｌｉｔｙ（ＳＯＣ）ｏｆｍｅｔａｌｏｇｅｎｉｃｄｙｎａｍｉｃｓｙｓｔｅｍｓ”（Ｙｕ，１９９８）：（１）Ｎｏｎｌ...

简介：MultistagesuperimposeddeformationhasbeendiscussedsystematicallybasedontheprogressofthestratigraphicsequencesofthenortheasternmarginofYangtzeBlock.Thenew-discoveredfirststagedeformationofthosesequencesoccurredfromthemiddleTriassictotheendofearlyJurassictogetherwithdevelopmentofregionalfolding,whichwasresultedfromthedeepdetachmentshearingtendingtowardNW-WNW.Thefoldsdiptoeastandfalldowntowardwest,andweresuperimposedbythemainstagefolding.Thereafter,aseriesoffoldsweredevelopedwithaxestrendingtowardnortheast.Consequentlynormalfoldsoccurredonthenormallimbswhileoverturnedfoldontheoverturnedlimbsduringthefirststagefolding.ThedetachmentorthrustwasformedfromlateJurassictoearlyCretaceous.DuetotheupliftingofDabieandtheWannanMountainsinthenorthandsouthsides,thebi-directionalthrustingbeltwasformedbygravityflowingfromtheMountainstowardthecenterofthebasinalongthenorthsideofXuanchengandsouthsideofGuichi.Thedeformationgeodynamicswasdiscussedsimplybasedonthenewlyrecognizedinformationaboutthetectonicevolution.

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：系统的Ce异例为整个岩石从跨越奥陶纪/志留纪(O/S)的页岩主导、连续、远洋的沉积序列被获得了在Tieshui的边界()Xiushan()，重庆()，华南。越过O/S边界的Ce异例在三间隔被认出，Wufeng()，Guanyinqiao()并且Longmaxi()。计算Ce/Ce*Wufeng形成的价值从0.84～0.96(avg。0.90)。在Guanyinqiao形成，计算Ce/Ce的价值*从0.73～0.85(avg。0.79)。Ce/Ce*价值最高从0.87～0.96的Longmaxi形成范围(avg。0.91)。沿着节，Ce异例的大小总是是否定的，但是在Guanyinqiao形成是更重要的。相对更高的Ce/Ce*在Wufeng和Longmaxi页岩的价值是可能的由于在减少的条件下面扔的沉积。Ce异例显然确实在伴随突出的集体扑灭的缺氧的事件起一些常规作用，并且这个工作为在结束抑制模型提供批评重要性的新数据--奥陶纪缺氧的事件和集体扑灭。

简介：水污染在在中国的最严重的环境问题之中，特别地在居住、城市的区域的附近。在几乎所有亚洲国家，河监视是主要基于化学数据的分析。然而，生物数据是为河的长期的生态的地位的决心的值得的增加并且在陡峭的污染和骚乱坡度的情况下是特别地很相配的。为用benthic无脊椎动物的河水质量评价的一个工具为长江的中间的活动范围的选择支流被开发了。地点选择被考虑物理化学的preclassification和hydromorphological条件支持。跟随一个成层的采样图案，34件样品在西方的湖北的副热带的多山的区域在小、大的流被拿()(中国)盖住一个污染坡度，在流特征上由一个广泛的域协议伴随了并且(physico-)化学的水分析。建议评价系统每taxon作为一个平均分数被计算。挑战将进一步认为从进如此的工具的发展的全球变化的另外的影响被讨论。

简介：

简介：<正>1.TectonicframeworkinthewestmarginofYangtzePlatformThewestmarginofYangtzeplatformhasclearzonation.Fromnorthtosouth,therearethreelongitudinaltectonicsections:thenorthsectionisLongmenshansection,themiddleisJinhe-ChenghaisectionandthesouthisHonghesection.Fromwesttoeast,threemeritudinalsub-tectonicbeltscanbeseen:1)outerbelt(westbelt)-ancientconti-nentalmargin/shelfseabelt;2)centralbelt-tectonictransformbelt;3)innetbelt(eastbelt)-continentalinnerbeltorinnermarginbelt.Thebasiccharacteristicsofthethreetectonicbeltcanbedescribedasfollows:

简介：Miaowan()ophiolite是在Yangtzecraton的北边缘附近外面收割的高度割下的ophiolitic建筑群。这建筑群的岩石由组成，从底部到顶，局部地包含podiform铬铁矿的harzburgitetectonite，纯橄榄岩，分层、各向同性的斑粝岩，sheeted堤建筑群(SDC)，有燧石豆荚和层的元枕头熔岩，和构造地设置的大理石。SDC向下是Miaowanophiolitic顺序，和等级的很重要、重要的部分进斑粝岩和ultramafic岩石，并且进元枕头熔岩向上。一些堤保存单程的chilled边缘，典型地代表extensionalophiolitic背景而大多数保存两倍chilled边缘，在寒心的方向能的情况中决定了。SDC主要由元辉绿岩(粗玄岩)组成，元斑粝岩和ultramafic的meta-plagiogranite，和小数量摇。LA-ICP-MS锆石标明日期收益一上面拦截年龄1026?????????????????????慩睯湡??灯楨汯瑩??丠潥牰瑯牥穯楯??慵杮楬杮？

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。

简介：TheprecisecorrelationoftheOrdoviciansuccessionsindifferentfaciesisdifficultduetothecomplexchangesofthetecto-paleogeographyinSouthChina.Basedonpreviousstudies,theauthorsrecognized103rdgradesequences,i.e.,Osq1toOsq10inascendingorder,bytheintegratedstudyofchronostratigraphy,biostratigraphyaswellastheanalysisonthesedimentaryfacies.TheauthorsareconfidenttocorrelatetheOrdoviciansuccessionspreciselyindifferentfaciesinanisochronousstratigraphicframeworkwiththeapplicationofthemethodofsequencestratigraphyandcorrelation.

简介：ThereisabeltofmetamorphiccorecomplexesinthewesternmarginoftheYangtzecraton.ThegeologicalsettingofthebeltissimilartothatoftheCordilleranmetamorphiccorecomplexes.AtypicaloneinthisbeltistheJianglangmetamorphiccorecomplex,whichhasaconfigurationconsistingofthreelayers:acorecomplexconsistingofMesoproterozoicschistsequence,aductilemiddleslabconsistingofPaleozoicmeta-sedimentary-basaltcharacterizedbythedevelopmentof"foldinglayer"andanuppercoverconsistingofXikangGroupwhichhassufferedbothbucklingandflattening.AdetachmentfaultdevelopedalongthecontactboundarybetweenthecoverandbasementcausestheomissionofUpperSinianandCambrianatthebaseofcover.Alotofnormalductileshearzonesdevelopedinthecovercausesthethinningofit.Allthefeaturesshowthattheearlyextensionresultsinthethinningofcrust,buttheformationofthedomeandexposureofbasementrocksmaybetheresultsofsuperimp

简介：BeddedchertsoccurringintheEarlyPermianGufengFormationintheLowerYangtzeregion,easternChina,arenearly20-80minthicknessandcontainvaryingamountsofradiolariansandspongespicules.TherearethreetypesofsectionfortheGufengFormation:chert,carbonateandchert-carbonatemixingtypes.Beddedchertsmainlyoccurinthefirstandthirdtypesofsection.Thedepocentresofsilicaaremarkedbysomesmall(notlargerthanafewthousandsquarekilometresinarea)rhombicorelliptichollowsandtheirformationwascontrolledbyfaults.Argillaceousvolcanicrocksinchertsoccurasnumerousthinlayers.BeddedchertsarecharacterizedbyhigherFeandlowerAlcontents,enrichmentinsuchtraceelementsasAs,Sb,Bi,Ga,Au,AgandCr,lowertotalREEabundance,negativeCeanomalyandvaryingdegreesofHREEenrichment.Thesecharacteristicsareimportantevidenceforhydrothermalcherts.Minoramountsofsubstancesofnon-hydrothermaloriginaremixedinthecherts.Thetempera

简介：FocusingontheYangtzeRivereconomiczone,thepreviousgeologicalresearchesaresystematicallysummarized,resourcesandenvironmentconditionsandmajorgeologicalproblemswhichareneedingtobeconcernedinlandplanningandconstructionarestudied.Theresultsshowthattheresourceconditionsofcultivatedland,shalegas,geotherm,lithiumandsoonaresuperiorintheYangtzeRivereconomiczone,andtheresourcesandenvironmentconditionsareconducivetodevelopthemodernagriculture,cleanenergyindustryandstrategicemergingindustries.3×1013m^2farmlandswithoutheavymetalpollutionareconcentrated;therearethreenationallevelshalegasexplorationanddevelopmentbaseswithexploredreservesof5.441×1011m^3;geothermalavailabilityis2.4×109tofstandardcoaleachyear,equivalentto19%oftheamountofcoalin2014;Asia'slargestenergylithiummetaloredepositisfound.InsomepartsofYangtzeRivereconomiczone,therearesomemajorgeologicalproblemssuchasactivefaults,karstcollapse,groundsubsidence,landslide-collapse-debrisflow,affectingtheriver-crossingchannels,high-speedrailway,urbanagglomerationandgreenecologicalcorridorplanningandconstruction.Thoseproblemsshouldbeconcerned,andtherelevantsuggestionsandcountermeasuresareputforward.Meanwhile,theideastofurthersupportthedevelopmentoftheYangtzeRivereconomiczoneareputforward.

简介：<正>AfterstudyingsystematicallyPetrology,Mineralogy,Petrochemistry,REEgeochemistryandstrontium,sulphur,leadisotopeofthealkali-richgraniteprophyrydistribuledextensivelytheYangtzeplatfromwesternmargin’salkali-richgraniteporphyrywepointoutthatthealkali-richgraniteporphyryhavethepropertiesofnewintrusiveages,Rangeoftheisotopeageisform36Mato51Ma,theybelongtotheHimalayadate,Mainmineralcomponetsofthealkali-richgraniteporphyryconsistofk-fcldspar(35~45x),quartz(36x±)plagioclase(15x±)andbiotitc(10x±).Accessorymineralsoftherockbelongtotypeof

简介：Thepaperdealswiththebackgroundfeatures,formationanddistributionofthechemicalel-ementsK,Na,Ca,Mg,Si,Fe,Mn,Cr,Ni,V,Co,Ti,Mo,Cu,Pb,Zn,As,Hg,Cd,Be,Li,Sr,B,F,Cl,BrandIinthegroundwaterintheregionofthemiddleandlowerreachesoftheYangtzeRiverandtheirrelationstothecompositionofthewater-bearingmedia,propertiesoftheoverly-ingrocksandsoils,redoxenvironment,andgroundwaterflowcondition,mineralizationandpHofgroundwater.

简介：摘要：广泛有机物(OM)富有的外形(黑页岩)在Yangtze区域发生在Ordo志留纪边界继任，华南。为了在Ordo志留纪期间调查Yangtze海的氧化还原作用变化，转移，二OM节(在在Zhangjiajie的Yichang，湖北省，和Sanjiaguan的Wangjiawan，湖南省)跨骑Ordo志留纪边界被学习。在这研究完成的大小包括总数的内容Fe的器官的碳(TOC)，黄铁矿硫，和不同种类，包括dithionite可引出的Fe(喂)，黄铁矿Fe(FeP)，HCI可引出的Fe(FeH)，和全部的Fe(FeT)在黑页岩，象另外的氧化还原作用代理一样，例如S/C比率，在高度反应的Fe之间的比率(FeHR=喂了+FeP)并且FeT，和Fep/(FeP+FeH)比率，作为pyritization(DOP)的度知道。在Wangjiawan节，中间的Ashgill沉积有高FeHR/FeT比率(0.20-0.77；avg。0.45)，高DOP价值(0.21-0.72；avg。0.54)，并且器官的碳内容的一个相对经常的硫内容独立人士。由对比，中间早，Hirnantian存款通常有低FeHR/FeT比率(0.10-0.35；avg。0.21)，低DOP价值(0.11-0.40；avg。0.28)，并且S/C价值在正常海洋的价值上正在聚类(S/C=0.36)。迟了的Hirnantian和早Rhuddanian存款，类似于那些中间的Ashgill存款，被高FeHR/FeT比率描绘(0.32-0.49；avg。0.41)，高DOP价值(0.46-0.68；avg。0.53)并且相当经常的硫内容。这些数据在间隔期间在Yangtze海架上建议海洋的血缺氧的出现中间的Ashgill，迟了的Hirnantian和早Rhuddanian，和通气并且氧化的水兵调节在期间中间早Hirnantian时间。中间早，Hirnantian通气了事件是有全球冰川的经期的伴随物，多半在架海床之上源于glacio海面升降的海平面的秋天和冷、稠密的氧化的水的随后的循环。因此，突然的变化从从迟了的Hirnantian氧化了到缺氧的海洋的水，早Rhuddanian从海面升降的海水平的冰期后的上升被结果。在subemergent高地附

简介：摘要：除了以前报导的小壳的石块(SSF)，一个宏观的石块集合，包括的丰富的水藻，锥形的管状的石块形式，和可能的印象一放大了后生动物，在西方的湖北省的Yangtze峡区域来自更低的寒武纪的Yanjiahe形成，华南。可见石块在thinlaminatedsiltstone被保存或泥泞siltstone在815公里厚的碳酸盐存款之间设置了，浅水里的抑制本地消沉的可能代表的沉积背景在早寒武纪的Meishucunian阶段期间焦化站台。宏观的石块协会关于生活的进化提供重要石块证据从对寒武纪的爆炸间隔晚前寒武纪。

简介：1.TheregionincludesavastpartofSE.China,NW.Burma,N.VietnamandN.Laos’Itisaheterogeneousandverycomplicatedtectonicprovince.TheretookplaceactiveintracontinentalgeodynamieproccsscsofIndosinianYanshanianandHimalagunteetoniccycles.Assupposed,Varicdirectedmovementsoflithosphericblocks,aswellastheirinteracti

简介：中央东方的美国和中国对增加敏感分别地从密西西比河和长江盆泛滥。这份报纸用31CMIP5(联合模型intercomparison工程阶段5)在这二大河盆对比极端降水的历史、投射的spatialtemporal分发历史的模型和RCP8.5(代表性的集中小径)实验。结果显示出那(1)在两河盆上，当最轻的降水在频率减少了时，最重的降雨事件在最近的十年增加了。在密西西比河盆上，两最轻的降水(<2.5公里/天)并且最重(>50公里/天)当中间的事件更经常发生在未来时，将尤其是在mid-2020s以后在频率减少；而在长江盆上，降水的所有范畴被投射在来十年在频率增加。(2)尽管CMIP5模型的一致能复制域时间平均数和降水的甚至平均时间的空间分发很好，他们没能在空间分发和时间工具两个都模仿降水趋势。以一种类似的方式，模型捕获了降水的统计很好，但是他们在代表不同降水紧张范畴的时间的变化有困难。(3)记录得好在二河盆上冷却的第20世纪表面夏天的第二一半在美国区域上与在他们之间的更高的反关联与降水趋势显示出不同协会，暗示贡献二河盆的冷却机制的不同过程。