A Study of Trace-Element Partitioning Between Pyroxene and Angritic Melt: Equilibrium and Kinetic Effects Including Sector Zoning in Pyroxene

Abstract

As part of an ongoing effort to determine partition coefficients, D, for relevant planetary materials, we have determined Ds for REE and Sc, V, Rb, Sr, Y, Zr, Nb, Ba, Hf, Th, and U between fassaitic pyroxene and melt. We have focused on both equilibrium and kinetically controlled partitioning and the application of the data to the petrogenesis of angrites. We used the synthetic ADOR starting material studied by [1], which was doped with trace elements at levels of 2 to 600 ppm The experiments were conducted in 1-atm, gas-mixing furnaces with the O fugacity fixed at 1.2 log units above the iron-wüstite buffer.

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