CUG EPMA_Oxides_METHOD_OlCpx1.0

This method was designed primarily for analysis of Olivine and Clinopyroxene by EPMA (electron probe microanalysis) using a JEOL JXA-8230 electron probe microanalyzer with four wavelength-dispersive spectrometers (WDS) at the Center for Global Tectonics, School of Earth Sciences, China University of Geosciences (Wuhan). 15 kV accelerating voltage, 20 nA probe current, and a 1 micron beam diameter had been used. Dwell times were 10s on element peaks and half that on background locations adjacent to peaks. Raw x-ray intensities were corrected using a ZAF (atomic number, absorption, fluorescence) correction procedure. A series of natural and synthetic SPI standards were utilized and changed based on the analyzing minerals. The following standards were used: Orthoclase (K), Almandine (Al), Diopside (Si, Ca, Mg), Magnetite (Fe), Jadeite (Na), Rhodonite (Mn), Rutile (Ti), Chromite(Cr) and Apatite (P).