A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper Mantle
It has been suggested that crystalline “phase egg,” AlSiO3OH, with a ratio Al/Si=1 could carry aluminum and water to the mantle but its natural occurrences are still speculative. An amorphous phase with a fixed and unique, deep metastable eutectic Al2Si2O7 composition was produced in laboratory expe...
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| Format: | Article |
| Language: | English |
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Wiley
2009-01-01
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| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2009/909431 |
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| author | Frans J. M. Rietmeijer Joseph A. Nuth |
| author_facet | Frans J. M. Rietmeijer Joseph A. Nuth |
| author_sort | Frans J. M. Rietmeijer |
| collection | DOAJ |
| description | It has been suggested that crystalline “phase egg,” AlSiO3OH, with a ratio Al/Si=1 could carry aluminum and water to the mantle but its natural occurrences are still speculative. An amorphous phase with a fixed and unique, deep metastable eutectic Al2Si2O7 composition was produced in laboratory experiments wherein conditions favored kinetically controlled formation of amorphous solids. This experimentally produced kaolinite-dehydroxylate is highly reactive and it is proposed as the precursor of phase egg in subducting slabs of crustal rocks. If so, metastable phases play a role in subduction zones and it then follows that the processes and resulting conditions in these environments can be nonuniform and discontinuous at least at micrometer scales. |
| format | Article |
| id | doaj-art-cda6de357f3647e9b734bc39a6363e37 |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2009-01-01 |
| publisher | Wiley |
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| series | International Journal of Geophysics |
| spelling | doaj-art-cda6de357f3647e9b734bc39a6363e372025-02-03T01:32:54ZengWileyInternational Journal of Geophysics1687-885X1687-88682009-01-01200910.1155/2009/909431909431A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper MantleFrans J. M. Rietmeijer0Joseph A. Nuth1Department of Earth and Planetary Sciences, University of New Mexico Albuquerque, NM 87131-0001, USAAstrochemistry Laboratory, Solar System Exploration Division, Code 691, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAIt has been suggested that crystalline “phase egg,” AlSiO3OH, with a ratio Al/Si=1 could carry aluminum and water to the mantle but its natural occurrences are still speculative. An amorphous phase with a fixed and unique, deep metastable eutectic Al2Si2O7 composition was produced in laboratory experiments wherein conditions favored kinetically controlled formation of amorphous solids. This experimentally produced kaolinite-dehydroxylate is highly reactive and it is proposed as the precursor of phase egg in subducting slabs of crustal rocks. If so, metastable phases play a role in subduction zones and it then follows that the processes and resulting conditions in these environments can be nonuniform and discontinuous at least at micrometer scales.http://dx.doi.org/10.1155/2009/909431 |
| spellingShingle | Frans J. M. Rietmeijer Joseph A. Nuth A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper Mantle International Journal of Geophysics |
| title | A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper Mantle |
| title_full | A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper Mantle |
| title_fullStr | A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper Mantle |
| title_full_unstemmed | A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper Mantle |
| title_short | A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper Mantle |
| title_sort | metastable aluminosilica compound for aluminum and water transport to the upper mantle |
| url | http://dx.doi.org/10.1155/2009/909431 |
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