文档介绍：MajorElements“Wet-chems”:gravimetric/volumetricMajorElementsModernSpectroscopicTechniquesFigure8-(2001):usuallygreaterthan1%SiO2Al2O3FeO*MgOCaONa2OK2OH2OMinorelements:-1%TiO2MnOP2O5CO2Traceelements:usually<%everythingelseElementWt%OxideAtom%’scrustAtypicalrockanalysisWt.%OxidestoAtom%ConversionOxideWt.%%+(O)#ofcationsinoxide+%ofmineralsseenNormisacalculated“idealized”mineralogyVariationDiagramsHowdowedisplaychemicaldatainameaningfulway?Bivariate(x-y)diagramsHarkerdiagramforCraterLakeFigure8-(),(munication).橄榄石(Fe,Mg)2SiO4SiO239%MgO40%斜方辉石(Fe,Mg)2Si2O6SiO254%普通辉石(CaNaK)…Al(AlSi)2O6SiO248%角闪石CaNaK…(Al4O11)2(OH…)SiO239%黑云母KAl…(AlSiO3O10)(OH…)SiO239%K2O10%石英SiO2SiO2100%钾长石KAlSi3O8SiO271%K2O8%斜长石NaAlSi3/CaAl2Si2O8SiO268-50%霞石NaAlSiO4SiO240%Na2O16%例钾长石SiO2%的计算K2O·Al2O3·6SiO2SiO2=*6/(++*6)=71%实用矿物化学