Structural considerations on the mechanism of the shock-induced zircon-scheelite transition in ZrSiO4 |
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| Institution: | 1. School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing 312000, PR China;2. Department of Architectural Engineering for Shaoxing University Yuanpei College, Shaoxing 312000, PR China;3. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China;1. Beijing Institute of Geology for Mineral Resources, Beijing 100012, China;2. Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China;3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;4. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;1. Géosciences Environnement Toulouse, UMR 5563, UPS OMP- CNRS – IRD, Université de Toulouse III Paul Sabatier, 14 Avenue E. Belin, 31400 Toulouse, France;2. Geological Department, Lomonosov Moscow State University, Vorobievu Gory, 119899 Moscow, Russia;3. Institut de Recherche en Astrophysique et Planétologie, UMR 5277, UPS OMP – CNRS – CNES, Université de Toulouse III Paul Sabatier, 9 Avenue du Colonel Roche, 31028 Toulouse Cedex, France |
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| Abstract: | The crystal structure of the scheelite-type ZrSiO4, which was transformed from the zircon-type under shock compression, was studied using an X-ray powder diffraction analysis. Positional parameters of O2- in the 16f site are determined to be u = 0.28, v = 0.14 and w = 0.07 (space group, I41/a). The X-ray powder diffraction lines were broad, indicating that the scheelite-type ZrSiO4 has considerable residual strain in the crystal. The mechanism of this shock-induced phase transition is discussed in terms of the displacive mechanism, where the 110] direction of the zircon-type is converted to the 001] direction of the scheelite-type. This model can explain why this zircon-scheelite transition occurs so fast under shock compression. |
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