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Experiments to Confirm Condensed Phase Assemblages Predicted by Equilibrium Thermodynamic Calculation in Dust-Enriched Systems: Preliminary Results

Introduction: The Cr-bearing, O-poor, Mg-, Alspinels (such as ALSP1) found in olivine-rich objects in the carbonaceous chondrites, Allende and Murchison, by [1] and [2] have been proposed to condense in a region of the solar nebula enriched 100 times in dust [2]. We have set out to explore experimentally the types of solid and liquid equilibrium assemblages that might form in these dust-enriched chemical systems at the temperatures where CAI-like liquids are stable condensates. These compositional regions lie near the border of where the CMAS model of [3] and the MELTS model of [4] begin to overlap, and experiments therefore allow an opportunity to clarify the nature of the phase boundaries, the phases present and the partitioning of trace elements among phases. Here, we investigate the spinels that form in the CMAS liquid + Al-spinel region and the adjacent CMAS liquid + spinel + perovskite field [5] . Experimental Technique: Equilibrium crystallization experiments were performed using two bulk compositions. The first composition (#400) is the calculated bulk composition of liquid plus solid condensates stable at 1800K during condensation of a vapor of solar composition having a dust/gas enrichment of 100X at P=10 bars [6]. The second composition (#401) is that calculated for the bulk condensed assemblage for a dust/gas enrichment of 50X at P=10 bars and 1760K.