Petrological Significance of Zoned Plagioclase in Eldjurti Granite and Mafic Microgranular Enclaves,North Caucasus,Russia-中国期刊网

摘要 Plagioclasephenocrystsfrommaficenclavesandplagioclasefromitshostgranitepossessapat-ternofcomplexzonation.Aplagioclasephenocrystcangenerallybedividedintothreeparts:anoscillatory,locallypatchyzonedcore(An47-19),aringwithdusty,morecalcicplagioclase(An64-20)andanormallyzonedrimcomposedofsodicplagioclase(An22-3.3).Majordiscontinuitiesinzoningcoincidewithresorptionsurfacesthatareovergrownbythemorecalcicplagioclase.Thecoresoflargeplagioclasephenocrystsfrommaficenclavesandhostgraniteshowsimilarzoningpatternsandsimilarcompositions,indicatingtheircrystallizationunderthesameconditions.SteepnormalzoningoftherimsofplagioclasesbothfromhostgraniteandmaficenclavesillustratesadrasticdecreaseinAncontentwhichisconsideredtohaveresultedfromthecontinuousdifferentiationofhybridmagmaandefficientheatlossbecauseoftheupwardemplacementoftheresidualmagma.Widerimsofplagioclasesfromthehostgraniteagainstthediscreterimsofplagioclasesfrommaficenclavesindicatethatdifferentiationandcoolinglastedmuchlongerinthehostgranitethaninthemaficenclaves.

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Petrological Significance of Zoned Plagioclase in Eldjurti Granite and Mafic Microgranular Enclaves,North Caucasus,Russia

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Petrological Significance of Zoned Plagioclase in Eldjurti Granite and Mafic Microgranular Enclaves,North Caucasus,Russia

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