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Hornblende dehydration reactions during magma ascent at Soufriere Hills Volcano, Montserrat

Abstract:

Hornblende phenocrysts in recent andesites of the Soufrière Hills Volcano display reaction rims of microcrystalline plagioclase, pyroxene, Fe-oxides and interstitial glass, formed by decompression during magma ascent. Mass balance calculations give the following reactions with mineral proportions in agreement with modal abundances: 100.0hbl→49.8cpx+27.6opx+18.2plag+4.5Ti-mag 100.0hbl→53.9cpx+24.4opx+8.1plag+1.9ilm+1.7mag These reactions require an open chemical system with exchange of selecte...

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Publication status:
Published

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Publisher copy:
10.1007/s00410-005-0060-5

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Institution:
University of Oxford
Division:
MPLS
Department:
Earth Sciences
Role:
Author
Journal:
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
Volume:
151
Issue:
2
Pages:
121-140
Publication date:
2006-02-01
DOI:
EISSN:
1432-0967
ISSN:
0010-7999
Source identifiers:
163736
Language:
English
Pubs id:
pubs:163736
UUID:
uuid:d0d9d8f0-a2e0-49dc-babb-e8990335a9d8
Local pid:
pubs:163736
Deposit date:
2012-12-19

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