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%) and K2O (~3%).

I have classified the rock as diorite based on the silica content and from petrography. However, i am having problem when i am calculating CIPW Norm, they show almost 32 to 39% quartz.

Therefore, my question is

1. Is it possible to have this much high Fe content and low Na2O, MgO and CaO content in diorite?

2. How can i give explanation about this rock chemistry which is quite unlike for diorite?

3. How can i give explanation about this much high NORM quartz where it should be like ~10%?

Please give me some explanation or a way out of this situation.