Raman and NMR spectroscopic characterization of high-pressure K-cymrite (KAlSi<sub>3</sub>O<sub>8</sub><sup>.</sup>H<sub>2</sub>O) and its anhydrous form (kokchetavite)
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- KANZAKI Masami
- Institute for Study of the Earth's Interior, Okayama University
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- XUE Xianyu
- Institute for Study of the Earth's Interior, Okayama University
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- AMALBERTI Julien
- Institut de Physique du Globe de Paris, Université Paris Sud Current address: Centre de Recherches Pétrographiques et Géochimiques
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- ZHANG Qian
- School of Earth and Space Sciences, Peking University
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Abstract
To facilitate identification of high-pressure K-cymrite (KAlSi3O8·H2O) phase and its anhydrous form (kokchetavite) in natural rocks, we have synthesized both phases and have characterized them by micro-Raman and NMR spectroscopy. K-cymrite was synthesized at 5 GPa and 800 °C. Kokchetavite was obtained by dehydrating K-cymrite at ambient pressure and 550 °C. The 1H MAS and 1H-29Si CP MAS NMR spectra of K-cymrite are consistent with the reported crystal structure that contains H2O molecules and has a disordered Si-Al distribution. The Raman spectra obtained under ambient conditions for K-cymrite (and kokchetavite) contain major peaks at 114.0 (109.1), 380.2 (390.0) and 832.5 (835.8) cm-1. For K-cymrite, OH stretching vibration is also observed at 3541 cm-1 with a shoulder at 3623 cm-1. The Raman spectrum for kokchetavite is consistent with that previously reported for a natural sample found as inclusions in clinopyroxenes and garnets in a garnet-pyroxene rock. However, the data for K-cymrite are inconsistent with the Raman features of a previously reported “relict K-cymrite in K-feldspar” from an eclogite. Pressure- and temperature-dependencies of the Raman shifts for the strongest peak of both phases are also reported.
Journal
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 107 (2), 114-119, 2012
Japan Association of Mineralogical Sciences
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Details 詳細情報について
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- CRID
- 1390001206545570688
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- NII Article ID
- 10030122449
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- NII Book ID
- AA11460926
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- BIBCODE
- 2012JMPeS.107..114K
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- COI
- 1:CAS:528:DC%2BC38XpvFCmsbg%3D
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- ISSN
- 13493825
- 13456296
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed