Cristobalite in volcanic ash of the Soufriere Hills volcano, Montserrat, British West Indies

  • Baxter P
  • Bonadonna C
  • Dupree R
 et al. 
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Abstract

Crystalline silica (mostly cristobalite) was produced by vapor-phase crystallization and devitrification in the andesite lava dome of the Soufriere Hills volcano, Montserrat. The sub-10 micrometer fraction of ash generated by pyroclastic flows formed by lava dome collapse contains 10 to 24 weight percent crystalline silica, an enrichment of 2 to 5 relative to the magma caused by selective crushing of the groundmass. The sub-10-micrometer fraction of ash generated by explosive eruptions has much lower contents (3 to 6 percent) of crystalline silica. High levels of cristobalite in respirable ash raise concerns about adverse health effects of long-term human exposure to ash from lava dome eruptions.

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Authors

  • P.J. Baxter

  • C. Bonadonna

  • R. Dupree

  • V.L. Hards

  • S.C. Kohn

  • M.D. Murphy

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