Why no clinopyroxene occurs in the fractionate phase using the easymelts?

[Gary]

Dear Paula

I attempt simulate the magmatic differentiation of mantle-derived lamprophyre magmas. The fractionate phase is always olivine, which actually do not occur in the lamprophyres. Clinopyroxene is the major fractionate phase based on the petrography. The parameters I set are shown in the figure. The temperature and pressure were estimated via the clinopyroxene–liquid thermobarometer. The composition was from the whole rock, which is equilibrium with the clinopyroxene. I want to acquire a simulation that clinopyroxene is the only fractionate phase.

Could you help me find what the problem is at your convenience?

All the best
Gary

[Paula]

Hi Gary,

Have you tried suppressing olivine?

Paula

[Gary]

Hi, Paula

I tried suppressing olivine. The easyMelts did not work. Then I increased the temperatures and decreased the pressures, then there was no fractionate phase. Next should I continue to adjust the conditions until the fractionate clinopyroxene occurs?
Many thanks!

Gary