The Influence of Oxygen Fugacity and Cooling Rate on the Crystallization of Ca-Al Inclusions from Allende

Although there appears to be general agreement that some coarse-grained Ca-Al-rich inclusions (CAIs) from Allende passed through a molten or partially molten stage in their evolution, there are several competing hypotheses to account for the formation of the liquid phase in CAIs (e.g., 1-4). Studies of the phase equilibria of CAI compositions can help distinguish between these mechanisms for generating liquids in CAIs