Silicon and Oxygen Isotopic Composition of Igneous Rocks from the Eastern Manus Basin-中国期刊网

摘要 Thispaperreportssiliconandoxygenisotopesof20kindsofigneousrocksandtheirmajorelementsfromtheeasternManusBasin.Combiningsiliconandoxygenisotopicdatafromotherstudies,wesupposethatbothδ30Siandδ18OvaluesincreasewiththeincreasingofSiO2content.Itmeansthatthefractionationofsiliconandoxygenisotopesareaffectedbythesilicacontent.ThepositivecorrelationbetweenCaO/Al2O3ratiosandMgOandthatbetweenSi/AlandSiO2contentindicatethatclinopyroxeneisthepredominantmineralphaseinoursamples.Wesupposethatthefractionationofsiliconandoxygenisotopesareinfluencedbymineralfractionalcrystallization.Probably,itisduetotheirdifferentsiliconandoxygenbridges.Inthisstudy,theδ30Simeanvalue=-0.17‰±0.17‰andδ18Omeanvalue=+6.07‰±0.57‰arehigherthannormalδ30Siandδ18Ovaluesofmantle,andweproposethattheseigneousrocksintheeasternManusBasinareaffectedbyhydrothermalalteration.

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Silicon and Oxygen Isotopic Composition of Igneous Rocks from the Eastern Manus Basin

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Silicon and Oxygen Isotopic Composition of Igneous Rocks from the Eastern Manus Basin

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