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Apatite as a monitor of late-stage magmatic processes at Volcán Irazú, Costa Rica

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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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Acknowledgments

This project was funded by a National Science Foundation MARGINS program Postdoctoral Fellowship (NSF-EAR-0549082). The SIMS laboratory at Arizona State University is funded by NSF EAR 0622775. Samples were generously provided by T. Plank, and collected by E. Benjamin. Apatites used as standards were provided by J. Hanchar, and S. Bergman. Many people contributed to this project via hearty discussion, including attendees of the SEIZE-SubFac Workshop 2007, and petrologists at ASU and UCLA. The article benefited from constructive criticism from J. Wade, G. Moore, M. Portnyagin, and an anonymous reviewer, and we thank them for their efforts.

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Authors and Affiliations

  1. School of Earth and Space Exploration, Arizona State University, Tempe, AZ, 85287-1404, USA

    Jeremy W. Boyce & Richard L. Hervig

  2. Department of Earth and Space Sciences, University of California, Los Angeles, Los Angeles, CA, 90095-1567, USA

    Jeremy W. Boyce

Authors
  1. Jeremy W. Boyce
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  2. Richard L. Hervig
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Correspondence to Jeremy W. Boyce.

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Communicated by J. Hoefs.

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Boyce, J.W., Hervig, R.L. Apatite as a monitor of late-stage magmatic processes at Volcán Irazú, Costa Rica. Contrib Mineral Petrol 157, 135–145 (2009). https://doi.org/10.1007/s00410-008-0325-x

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  • DOI: https://doi.org/10.1007/s00410-008-0325-x

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