In situ X-ray observation of decomposition of hydrous aluminum silicate AlSiO3OH and aluminum oxide hydroxide d-AlOOH at high pressure and temperature |
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| Institution: | 1. Institute of Mineralogy, Petrology, and Economic Geology, Tokohu University, Aza Aoba Aramaki, Sendai 980-8578, Japan;2. Japan Synchrotron Radiation Research Institute, Mikazuki-cho, Sayo-gun, Hyogo, Japan;1. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China;2. Department of Earth Science, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan;3. HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA;4. Center for Advanced Radiation Sources, University of Chicago, Chicago, IL 60637, USA;1. Institute of Materials and Environmental Chemistry, Research Center for Natural Sciences, Hungarian Academy of Sciences, H-1117 Budapest, Magyar Tudósok Körútja 2, Hungary;2. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1404, USA;3. School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-1604, USA;4. Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan;5. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA;6. Geological and Geophysical Institute of Hungary, Stefánia street 14., Budapest 1143, Hungary;7. Hungarian Institute for Forensic Sciences, Mosonyi u. 9, Budapest 1087, Hungary;1. Institute for Study of the Earth''s Interior, Okayama University, Misasa, Tottori 682-0193, Japan;2. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Miyagi, Sendai 980-8578, Japan;3. Department of Earth and Planetary Material Sciences, Tohoku University, Miyagi, Sendai 980-8578, Japan;4. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 678-5198, Japan;1. Bayerisches Geoinstitut, Universität Bayreuth, D95440, Bayreuth, Germany;2. Center for High Pressure Science and Technology Advanced Research, 100097, Beijing, PR China;1. School of Earth and Space Sciences, Peking University, Beijing, 100871, China;2. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education of China, Beijing, 100871, China;3. Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, 78712, USA;4. School of Gemmology, China University of Geosciences (Beijing), Beijing, 100083, China;5. Center of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao, 266071, China;6. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;1. Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany;2. Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, United Kingdom;3. Deutsches GeoForschungsZentrum, 14473 Potsdam, Germany |
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| Abstract: | We clarified the stability limit of phase Egg, AlSiO3OH, a candidate for water reservoir in the siliceous sediment of slabs in the transition zone conditions by in situ X-ray observation using high energy X-ray from synchrotron radiation source of SPring-8. Phase Egg is stable at least up to 1625 °C at 17 GPa. We observed decomposition of phase Egg into δ-AlOOH and stishovite at pressures greater than 23 GPa at temperatures below 1200 °C. No water release occurs associated with the decomposition. At temperatures above 1200 °C at 23 GPa, we observed decomposition of phase Egg into corundum+stishovite+fluid. We also determined the phase boundary of the decomposition reaction of δ-AlOOH to corumdum+fluid based on the in situ X-ray diffraction at high pressure and temperature. |
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