The high-pressure stability of Mg-sursassite in a model hydrous peridotite: a possible mechanism for the deep subduction of significant volumes of H2O

The high-pressure stability of Mg-sursassite in a model hydrous peridotite: a possible mechanism for the deep subduction of significant volumes of H2O

The stability of the high-pressure phase Mg-sursassite, previously MgMgAl-pumpellyite, in ultramafic compositions has been determined in experiments in the system MgO-Al2O3-siO2-H2O (MASH). The breakdown of Mg-sursassite + forsterite + enstatite to pyrope + vapor with increasing temperature was brac...

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Veröffentlicht in:Contributions to mineralogy and petrology 2002-03, Vol.142 (6), p.714-723
Hauptverfasser: Bromiley, Geoffrey D., Pawley, Alison R.
Format: Artikel
Sprache:eng
Schlagworte:
Chemical reactions
Mineralogy
Petrology
Water
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Zusammenfassung:The stability of the high-pressure phase Mg-sursassite, previously MgMgAl-pumpellyite, in ultramafic compositions has been determined in experiments in the system MgO-Al2O3-siO2-H2O (MASH). The breakdown of Mg-sursassite + forsterite + enstatite to pyrope + vapor with increasing temperature was bracketed at 6.0 and 7.0 GPa.
ISSN:0010-7999
1432-0967
DOI:10.1007/s00410-001-0318-5