Stability and crystal chemistry of iron-bearing dense hydrous magnesium silicates |
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| Institution: | 1. Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany;2. Institut für Geowissenschaften, Friedrich-Schiller-Universität Jena, Carl-Zeiss-Promenade 10, D-07745 Jena, Germany;1. Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA;2. Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA;1. Department of Geosciences, Indiana University – Purdue University Fort Wayne, 2101 East Coliseum Boulevard, Fort Wayne, IN 46805-1499, USA;2. Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden;3. Department of Geology, Lund University, SE-223 62 Lund, Sweden;4. Geological and Environmental Sciences Department, Schaap Science Center, 2017, 35 East 12th Street, Holland, MI 49423-3605, USA;2. Helmholtz-Zentrum Potsdam – Deutsches GeoForschungsZentrum, Potsdam, Germany;3. Mekorot Co Ltd., Tel Aviv, Israel;4. Ministry of Water and Irrigation, Amman, Jordan;1. Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA;2. Department of Earth and Planetary Sciences, University of California, Davis, CA 95616, USA;1. Instituto de Geología Económica Aplicada, Universidad de Concepción, Casilla 160-C, Concepción, Chile;2. Departamento de Ingeniería Metalúrgica, Facultad de Ingeniería, Universidad de Concepción, Casilla 160-C, Chile;1. Department of Clinical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA;2. Department of Animal and Rangeland Sciences, Oregon State University, Corvallis, OR 97331, USA;3. Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA;4. School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR 97331, USA |
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| Abstract: | Dense hydrous magnesium silicates (DHMS) are supposed to be key phases in planetary water cycles because of their ability to carry water to deep mantle regions in subduction slab environments. In order to understand water cycles in iron-enriched planetary systems such as Mars knowledge of the water content and stability of iron-bearing DHMS is required. Iron-bearing DHMS were synthesized based on two starting compositions, MgFeSiO4 + 9.5 wt% H2O system and a simple hydrous Martian mantle composition containing Fe, Mg, Al and Si + 12.35 wt% H2O (hydrous FMAS system). Compared to literature data on phase D, iron-bearing phase D shows analogous variations in water contents as Mg-phase D but appears to be stable at higher temperatures than Mg-phase D for both starting compositions used in this study. Iron-bearing superhydrous phase B contains up to 7 wt% H2O and shows an extended thermal stability in the hydrous FMAS system. The high-temperature stability of iron-bearing DHMS with a Mars-like bulk composition indicates that these hydrous phases could host significant amounts of water at core-mantle boundary conditions (1500 °C and 23 GPa) in a hydrous Martian mantle. |
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| Keywords: | Dense hydrous magnesium silicates Mars Water cycle Mantle mineralogy High-pressure experiments |
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