Is it possible to have high Fe content and relatively low CaO, Na2O, MgO and K2O content in diorite in XRF major element analysis?

I have analyzed three rock sample by XRF(rigaku ZSX primus), i obtained SiO2 (52, 57,58 wt%), Al2O3 (16-18 wt%), F2O3t (~15 wt%). however, MgO (0.83-1.8 wt%), CaO (2-4%), Na2O (0.05, 0.05, 3.03%)...

14 March 2019 4,880 0 View