Cristobalite in Volcanic Ash of the Soufriere Hills Volcano, Montserrat, British West Indies
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- P. J. Baxter
- Department of Community Medicine, University of Cambridge, Gresham Road, Cambridge, CB12 ES, UK.
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- C. Bonadonna
- Department of Earth Sciences, Bristol University, Queens Road, Bristol BS8 1RJ, UK.
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- R. Dupree
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
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- V. L. Hards
- British Geological Survey, Keyworth, Nottingham NG12 5GG, UK.
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- S. C. Kohn
- Department of Earth Sciences, Bristol University, Queens Road, Bristol BS8 1RJ, UK.
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- M. D. Murphy
- Department of Earth Sciences, Bristol University, Queens Road, Bristol BS8 1RJ, UK.
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- A. Nichols
- Institute of Occupational Medicine, 8 Roxburgh Place, Edinburgh EH8 9SU, UK.
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- R. A. Nicholson
- British Geological Survey, Keyworth, Nottingham NG12 5GG, UK.
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- G. Norton
- British Geological Survey, Keyworth, Nottingham NG12 5GG, UK.
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- A. Searl
- Institute of Occupational Medicine, 8 Roxburgh Place, Edinburgh EH8 9SU, UK.
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- R. S. J. Sparks
- Department of Earth Sciences, Bristol University, Queens Road, Bristol BS8 1RJ, UK.
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- B. P. Vickers
- British Geological Survey, Keyworth, Nottingham NG12 5GG, UK.
書誌事項
- 公開日
- 1999-02-19
- DOI
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- 10.1126/science.283.5405.1142
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:p>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.</jats:p>
収録刊行物
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- Science
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Science 283 (5405), 1142-1145, 1999-02-19
American Association for the Advancement of Science (AAAS)
