简介:The22ndIASMeetingofSedimentologywasheldintheConventionCentreoftheGrandHotelAdriatic,inasmalltouristictownOpatija,locatedontheeasternAdriaticcoastwhereCentralEuropeandtheMediterraneanmeet.ItwasthesecondIASMeetingheldinCroatia--thefirstone,4thIASRegionalMeetingofSedimentology,washeldinSplitin1983.TheMeetinginOpatijawasorganizedbytheInstituteofGeology(Zagreb)andtheCroatianGeologicalSociety.ThesponsorwasMinistryofScienceandTechnologyoftheReoublicofCroatia.
简介:Theresultsof118REEanalysesofLi-FgranitesfromSouthChinaandothercountriesindicatethattherearethreevariationtypesofREEpatterncurveswithdifferentevolutiontrendsfromearlytolatestagesofLi-FgranitecomplexoffromlowertoupperpetrofaciesoftheLi-Fgranitebody;(1)thedecreasing,(2)theincreasing,and(3)thesaltatoryvariationtypes.Thefirstvariationtypeiscalledthepositiveevolutiontype,attributedtocrystallizationdifferentiation.Thesecondiscalledthereversionevolutiontype.whichrepresentsliquidsegreationdominatedbyvapor-liquiddistillation.Thethirdiscalledthesaltatoryvariationtype,whichisformedfromliquidsegregationdominatedbyimmiscibilty,Therefore,theindicaticesofliquidsegregationdominatedbyimmiscibilityarethesaltatoryvariationtypeofREEpatternevolutionandtheseparationofthemainevolutiontrendlineseitherfromthesub-evolutiontrendlinesorfromthecompositionpointsofLi-FgranitesinthediagramsofREE-(La-Yb)NandLa/Sm-La,Theindicatricesofliquidsegregationdominatedbyvapor-liquidfractionaldistillationarethereverstionevolutiontypeofREEpatterncurvesandthemainevolutiontrendlinesofLi-Fgranitesdirectingtotheupperright-handontheREE-La/Yb)NandLa/Sm-Ladiagrams.