Print Page - Why no clinopyroxene occurs in the fractionate phase using the easymelts?

Title: Why no clinopyroxene occurs in the fractionate phase using the easymelts?
Post by: Gary on January 06, 2025, 09:46:04 PM

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

(https://www.helloimg.com/i/2025/01/07/677cbeb52faca.png)
(https://www.helloimg.com/i/2025/01/07/677cbeb575180.png)

Title: Re: Why no clinopyroxene occurs in the fractionate phase using the easymelts?
Post by: Paula on January 07, 2025, 09:52:25 AM

Hi Gary,

Have you tried suppressing olivine?

Paula

Title: Re: Why no clinopyroxene occurs in the fractionate phase using the easymelts?
Post by: Gary on January 07, 2025, 07:26:16 PM

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

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MELTS for Excel, rhyolite-MELTS (GUI) and alphaMELTS => The MELTS family of algorithms, and scientific discussion => Topic started by: Gary on January 06, 2025, 09:46:04 PM