摘要
WudalianchivolcanicrocksarethemosttypicalCenozoicpotassicvolcanicrocksineastenChina.Compositionalcomparisonsbetweenwholerocksandglassesofvariousoccurrencesindicatethatthemagmatendstobecomerichinsilicaandalkalisasaresultofcrystaldifferentiationinthecourseofevolu-tion.TheyareuniqueinisotopiccompositionwithmoreradiogenicSrbutlessradiogenicPb.^87Sr/^86Srishigherand^143Nd/^144Ndislowerthantheundifferentiatedglobalvalues.Incomparisontocontinentalpot-ashvolcanicrocks,Pbisotopesareapparentlylower.Thesevariousthreadsofevidenceindicatethattherockswerederivedfromaprimaryenrichedmantlewhichhadnotbeensubjectedtoreworkingandshowsnosignofincorporationofcrustalmaterial.ThecorrelationbetweenPbandSrsuggeststheregionalheterogeneityintheuppermantleintermsofchemicalcomposition.
出版日期
1989年04月14日（中国期刊网平台首次上网日期，不代表论文的发表时间）
