Optimizing pre-eruptive temperature estimates in thermally and chemically zoned magma chambers

We present a method to minimize the error of temperature estimate when multiple discrete populations of glass and clinopyroxene occur in a single heterogeneous eruptive unit. As test data we have used ~. 1100 clinopyroxene-melt pairs from isothermal and thermal gradient experiments. These latter are characterized by the crystallization of multiple modes of clinopyroxene as frequently documented for chemically and thermally zoned magma chambers. Equilibrium clinopyroxene-melt pairs are identified through the difference between predicted and measured components in clinopyroxene. The use of these... Mehr ...