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Melting by ratio

Started by Dengeo, May 24, 2017, 10:18:45 AM

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Dengeo

Hi Paula,

I was wondering if there was a way to model fractional melting of a garnet-peridotite source using mineral ratios. For example, modeling the source Ol:Opx:Cpx:Grt with a ratio of 0.55:0.25:0.12:0.08 to a melted ratio of 0.05:0.05:0.45:0.45. The only way I can think to do this is by melting a typical garnet-peridotite and calculating multiple ratios as I melt it using the adiabat.

Thanks for the help!

Paula

Hi,

There isn't a way to set the melting ratios, and it wouldn't really make sense to do so in the context of MELTS. However, I guess you could construct a garnet peridotite bulk composition with typical mineral compositions and the initial ratios you would like. Then try running forward models for a range of potential temperatures and see which one most closely matches the target ratio in the residue (e.g. 0.52:0.24:0.07:0.05 approx).

Sorry not to be of more help. If I've misunderstood what you would like to do, let me know...

Paula