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Representative major element compositions of clinopyroxenes and phlogopites from ultrapotassic rocks from Nangqian basin (Eastern Tibet)

2020

Representative major element compositions (in wt%) of clinopyroxenes and phlogopites from Nangqian ultrapotassic rocks. In-situ major-element compositions of mineral phases were obtained using the JEOL JXA-8230 Electron Microprobe at ISTerre, University Grenoble Alpes. Analytical conditions were 15 kV accelerating voltage and 12 nA beam current. The ZAF procedure was applied to reduce the raw data. The microprobe was calibrated using natural and synthetic standards. An X-ray element map of a calcite-bearing aggregate was acquired using 15 kV accelerating voltage and 10 nA beam current.

Elements totalMagnesium numberLongitude of eventmineralWhole-rock geochemistrySample commentElectron microprobe JEOL JXA 8230Latitude of eventcarbonate C-O isotopyChromium(III) oxideManganese oxideSodium oxideIron oxide Fe2O3Iron oxideSilicon dioxideWhole rock geochemistryAluminium oxideMagnesium number liquidtotalMagnesium oxideMineralsElectron microprobe JEOL JXA-8230Event labelcarbonate C O isotopyCalcium oxidein-situ mineral geochemistryPotassium oxideElementsin situ mineral geochemistryMagnesium number mineralChromium III oxideEarth System ResearchTitanium dioxideFe2O3
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