Major element, trace element, and H2O abundances in clinopyroxene phenocrysts and equilibrium melts from the Austral Islands

Description

Clinopyroxene phenocrysts crystallized at depth from ocean island basalts record information on magma H2O contents and may be less prone to degassing processes than quenched glasses or melt inclusions formed at lower pressures. Here we report major and trace element and H2O abundances in clinopyroxene phenocrysts from Austral Island basalts, as well as calculated melt compositions in equilibrium with the phenocrysts. These data provide constraints on pre-eruptive magmatic water contents in basaltic magmas from an ocean island setting. This dataset also provides information on the calibration curves used in SIMS analysis of the phenocryst water contents, and estimated cpx/melt partition coefficients used to calculate melt compositions.

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Clinopyroxene major elements were analyzed via electron microprobe at U Texas at Austin; Trace elements and [H2O] were measured by LA-ICP-MS as UT Austin. [H2O] was measured by SIMS at Arizona State University. Melt compositions in equilibrium with clinopyroxene phenocrysts were calculated by first calculating cpx/melt Kd values using published parameterizations cited in the data tables. Complete analytical details and details on melt calculation are provided in the companion Contributions to Mineralogy and Petrology manuscript Bruce et al. (2024).

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