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1、AmericanMineralogist,Volume85,pages1105–1116,2000MeasurementofcrystalsizedistributionsMICHAELD.HIGGINS*SciencesdelaTerre,UniversitéduQuébecàChicoutimi,Chicoutimi,G7H2B1,CanadaABSTRACTStudiesofcrystalsizedistributions(CSD)canrevealmuchabouthowrockssolidifyandund
2、erwhatconditions.Datafromtwo-dimensionalsectionscanbereadilyacquiredatmanydifferentscales,fromelectronmicroscopeimages,thinsections,slabs,outcrops,andsoon,buttheconver-siontotrue,three-dimensionalvaluesiscomplex.ThewidelyusedWagermethoddoesnothaveagoodtheoretic
3、albasisanddoesnotgiveaccurateresults.AmodificationoftheSaltikovcorrectionmethodisproposedherethatismoreaccurateandcanaccountfordifferentcrystalshapesandfabrics.Populationdensitiesdeterminedbythismethoddifferbyfactorsof0.02to100fromthosedeterminedbytheWagermetho
4、d.PublishedCSDsdeterminedusingothermethodscanberecalcu-latedifthecrystalshapeandfabricparameterscanbeestimated.Themethodhasbeenincorporatedintoanewprogram,CSDCorrections.INTRODUCTIONreluctanttoembarkuponresearchinthisfieldbecausethereisTexturalstudiesinigneousp
5、etrologyflourishedinthenine-nopublishedgeneralguideonhowtodetermineCSDs.Inthisteenthcentury,followingthedevelopmentofthepetrographicpaperItrytofillthatgap,basedonmyownexperiences.Inthemicroscope.Atthattime,texturalobservationswerequalita-firstpartIdescribepract
6、icalmethodsforacquiringdatafromtive—averagegrain-sizes,grainrelationship,andfabrics.Al-two-dimensionalsections,suchasoutcrops,slabs,andthinsec-thoughqualitativedatahasitsuses,itcannotconstrainphysicaltions.Thesecondpartwillconcerntheconversionoftwo-di-modelsofp
7、rocessesinthesamewaythatquantitativedatacan.mensionaldatatothree-dimensionalCSDs.IdiscussaspectsTexturesareimportantbecausetheyresultfromthesolidifica-ofthegeneralproblemandapproachestothesolution.Acom-tionofrocks,andhenceifwewanttounderstandsolidificationputer
8、programispresentedthatenablestheconversiontobeofigneousrocksthenwemustquantifyandmodeltexture.Imadesimply.usethewordsolidificationratherthancrystallizationbecauseMETHODSOFAC
