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

Original Paper

DOI: 10.1007/s00410-008-0325-x

Cite this article as:
Boyce, J.W. & Hervig, R.L. Contrib Mineral Petrol (2009) 157: 135. doi:10.1007/s00410-008-0325-x
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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.

Keywords

Apatite Irazú Costa Rica Volcano Volatiles Magma Melt Inclusions 

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.School of Earth and Space ExplorationArizona State UniversityTempeUSA
  2. 2.Department of Earth and Space SciencesUniversity of California, Los AngelesLos AngelesUSA

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