text: Major and minor element concentrations are generally determined using EPMA and common element compositions include Si, Ti, Al, Cr, Fe, Mn, Mg, Ca, Ni, Na, K, P, Cl, F and S. Knowledge of the oxide concentrations related to these major and minor elements can help to determine the composition of the parental magma, the melt inclusion and the phenocryst hosts.
  Trace element concentrations can be measured by SIMS analysis with resolution in some cases as low as 1 ppm. LA-ICPMS analyses can also be used to determine trace element concentrations, however lower resolution compared to SIMS does not provide determination of concentrations as low as 1 ppm.