THE HIGH-PRESSURE STABILITY OF MG-SURSASSITE IN A MODEL HYDROUS PERIDOTITE: A POSSIBLE MECHANISM FOR THE DEEP SUBDUCTION OF SIGNIFICANT VOLUMES OF H2O
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dc.contributor.author | Bromiley G.D. | |
dc.contributor.author | Pawley A.R. | |
dc.date.accessioned | 2021-04-16T05:17:19Z | |
dc.date.available | 2021-04-16T05:17:19Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=958476 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2002, 142, 6, 714-723 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27913 | |
dc.description.abstract | 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 + vapour with increasing temperature was bracketed at 6.0 and 7.0 GPa. Below 6.0 GPa, Mg-sursassite + forsterite + vapour reacts to chlorite + enstatite. This reaction provides a mechanism for transfer of water from chlorite- to Mg-sursassite-bearing assemblages. At pressures of 7.0 GPa and above, the assemblage Mg-sursassite + phase A + enstatite was found. Phase relations involving Mg-sursassite and phase A are considered. For bulk compositions with a low water content, the vapour-absent reaction Mg-sursassite + forsterite = pyrope + phase A + enstatite determines the upper-pressure stability of Mg-sursassite, and provides a mechanism for the complete transfer of water from Mg-sursassite to phase A-bearing assemblages. Mg-sursassite plays an important role in peridotite compositions in the subducting slab because, at temperatures below 700 °C, it can transfer water from hydrous phases such as antigorite and chlorite to high-pressure stable phases such as phase A. | |
dc.title | THE HIGH-PRESSURE STABILITY OF MG-SURSASSITE IN A MODEL HYDROUS PERIDOTITE: A POSSIBLE MECHANISM FOR THE DEEP SUBDUCTION OF SIGNIFICANT VOLUMES OF H2O | |
dc.type | Статья |
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