Abstract
Compilations of experimental data allow the clinopyroxene Fe = Mg exchange equilibrium constant (Kd = (XFe/XMg) Clinopyroxene / (XFe/XMg) Melt) to be parameterized. Values of Kd increase with increasing pressure, temperature, Log fO 2, melt CaO, NBO/TO, LnMgO, MgO#; and with decreasing melt SiO 2, and Na 2O + K 2O. Multiple regression analysis yields improved fits, including some based solely on mineral compositional data. These parameterizations allow improved petrogenetic hypothesis testing for clinopyroxene-bearing assemblages.
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