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English AbstractVolcanic RocksReference SamplesPorphyry CopperChemical CompositionClay DepositsMajor ElementsMagnetic SusceptibilityDifferentiation IndexClay MineralsGranitic ComplexEnglish SummaryKaolin MineralsIsotopic FractionationGeological MaterialsCombustion-infrared Absorption SpectrometryQuartz DioriteStandard SamplesFelsic RocksSilica Content