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

Jeremy W. Boyce, Richard Hervig

Research output: Contribution to journalArticle

44 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)135-145
Number of pages11
JournalContributions to Mineralogy and Petrology
Volume157
Issue number2
DOIs
StatePublished - Jan 1 2009

Keywords

  • Apatite
  • Costa Rica
  • Irazú
  • Magma
  • Melt inclusions
  • Volatiles
  • Volcano

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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