Apatite as a monitor of late-stage magmatic processes at Volcán Irazú, Costa Rica |
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| Authors: | Jeremy W Boyce Richard L Hervig |
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| Institution: | (1) School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1404, USA;(2) Department of Earth and Space Sciences, University of California, Los Angeles, Los Angeles, CA 90095-1567, USA |
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| Abstract: | Apatite phenocrysts from the 1963 and 1723 eruptions of Irazú volcano (Costa Rica) record a volatile evolution history that
confirms previous melt inclusion studies, and provides additional information concerning the relative and absolute timing
of subvolcanic magmatic events. Measurements of H, Cl, and F by secondary ion mass spectrometry reveal multiple populations
of apatite in both 1723 and 1963 magmas. Assuming nominal apatite/melt partition coefficients allows us to compare the pattern
of melt inclusions and apatites in ternary space, demonstrating the fidelity of the record preserved in apatite, and revealing
a complex history of magma mixing with at least two components. The preservation of heterogeneous populations of apatite and
of internally heterogeneous crystals requires short timescales (days to years) for these magmatic processes to occur. |
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| Keywords: | Apatite Irazú Costa Rica Volcano Volatiles Magma Melt Inclusions |
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