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Crystallisation of anhydrite-bearing magmas

Published online by Cambridge University Press:  03 November 2011

Leslie L. Baker  and
Malcolm J. Rutherford
Leslie L. Baker
Affiliation:
Leslie L. Baker and Malcolm J. Rutherford, Department of Geological Sciences, Brown University, Providence, RI 02912, U.S.A.
Malcolm J. Rutherford
Affiliation:
Leslie L. Baker and Malcolm J. Rutherford, Department of Geological Sciences, Brown University, Providence, RI 02912, U.S.A.
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Abstract:

Anhydrite has been identified as a phenocrystic phase in some silicic volcanic magmas, but it is not commonly described in plutonic rocks. Anhydrite-bearing magmas tend to form in arc environments and to contain hydrous, low-temperature, oxidised mineral assemblages. Phenocrystic anhydrite coexists with sulphur-enriched apatite and sometimes with pyrrhotite, in silicate melt that contains from 50 ppm to 1 wt% S, depending on temperature and conditions. Vapour coexisting with anhydrite- and water-saturated magma may contain from a few tenths of a mole per cent to a few mole per cent sulphur gases (SO2 and H2S), with the exact composition and gas speciation depending on temperature and oxygen fugacity. Samples of one anhydrite-bearing magma, the 1991 Pinatubo dacite, have been experimentally crystallised to determine whether the magma retains its characteristic sulphur-rich mineral phases during solidification. Results show that anhydrite and sulphur-rich apatite are retained throughout crystallisation and vapour phase evolution. This suggests that anhydrite-bearing intrusive equivalents of the Pinatubo dacite should be present in arc plutonic complexes.

Keywords

PinatuboEl Chichónsulphurvolatilesarc magmas
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 87 , Issue 1-2: Third Hutton Symposium. The Origin of Ganites and Related Rocks , 1996 , pp. 243 - 250
Copyright
Copyright © Royal Society of Edinburgh 1996

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