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.

简介：Li-Fgranitesallovertheworldcanberepresentedbythreeendmembers,i.e.,theNa-richongonite(O),theK-richxianghualingite(X)andtheSi-richtopazite(T),Charactersandcriteriaarepresentedfortheseend-mnemberrocks,VerticalzoninginLi-Fgranites,asreflectedbyincreasingnormativeQandC(corundum)anddecreasingALK(K2O+Na2O)withincreasingcontentoffluorine,canbeexplainedusingthethree-end-memberschemeintermsofpetrochemistryandnorms.Consideringthedifferenceinmeltstructure,visocosityanddensitybetweentheendmembers,incouplewiththeregulartiesthatgoverntheNa-KandSiALKsegregationknownfromfieldevidenceandexperiments,itissuggestedthatthethreeendmembersmayhaveresultedfromliquidsegregation(immiscibility)ratherthanfromcrystalfractionationascommonlybelieved.