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

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：DuringtheEarly-MiddleProterozoicera,threemajorlithostratigraphicunitassociations,namelyHekou-Dahongshan,Dongchuan,andKunyang-HuiliGroups,wereestablishedforthemetamorphosedvolcanicsedimentaryrocksexposedinthesouthwesternYangtzeBlock(SWYB).Theintegrationofpetrology,geochemistryandgeochronologyconstrainstectonicframeworkandevolutionoftheSWYB,inwhichfoursetsofSHRIMPU-PbzirconageswereobtainedfromthevolcanicrocksinterbeddedwithintheMiddleProterozoicsuccessions:1800-1600Ma,1600-1300Ma,1300-1100Ma,and1100-1000Ma.Majorandtraceelementalanalysisindicatethatfourkeytectonicevolutionarystages,eachcoincidingwiththeaboveradiometricageset,oftheSWYBduringtheEarly-MiddleMesoproterozoic.TheSWYBwascharacterizedbyaneast-westerlytrendingriftintheHekou,Dongshan,andDongchuanareas,andseparatebasin-formingeventsduring1800-1600Maarid1600-1300Ma,respectively.IntheSWYB,anintracontinentalriftbasinandariftbasinoccurredintheCaiziyuan-MatangandLaowushanareas,respectivelyin1300-1100Maago.During1100-1000Ma,theSWYBwascharacterizedbytheclosureoftheCaiziyuan-Matangrift-oceanbasin,collisionbetweentheHuiliBlocksandKunyangBlocks,andpresenceofvolcanicaresintheTianbaoshanandFulingpenareas.Accordingly,theSWYBrepresentsanewbasinthatrecordstherelativelycompleteassemblyprocessoftheRodinaduringtheEarly-MiddleMesoproterozoicera.

简介：在Huangling背斜位于YangtzeCraton以内的olivine-gabbroic岩石被标明日期在大约由LA-ICP-MS的857-854妈方法。岩石属于亚alkaline系列并且由辉石(35%-40%)组成，斜长石(40%-45%)，橄榄石(8%-10%)和尖晶石(3%-5%)。橄榄石有作为贵橄榄石被分类的73-83的Fo价值。辉石有FeO(6.60wt.%-8.23wt.%)的相对低内容，但是然而，高CaO(20.23wt.%-21.25wt.%)满足斜长石有高级艾尔2O3(31.78wt.%-32.37wt.%)，CaO(16.08wt.%-16.25wt.%)并且一(79-80)价值，但是低Na2O内容(1.95wt.%-2.11wt.%)。尖晶石是有MgO(13.65wt.%-13.68wt.%)的高内容的特征的magnesioferrite，FeO(23.27wt.%-23.40wt.%)和艾尔2O3(62.43wt.%-62.74wt.%)。这些矿物质的化学作文类似于在造山运动以后的环境被形成的斑粝岩岩石的那些。橄榄石斑粝岩样品有否定锆石Hf价值(-16.57吗？？

简介：