Тип публикации: статья из журнала
Год издания: 2017
Идентификатор DOI: 10.1002/jrs.5167
Ключевые слова: coesite, diamond, disordered graphite, Raman imaging, UHP-HT metamorphism
Аннотация: Confocal 2D and 3D Raman imaging was applied to SiO2 inclusions in kyanite porphyroblasts from diamond-bearing kyanite gneisses of the Kokchetav Massif (Northern Kazakhstan). The study reveals a mineral assemblage of coesite-disordered graphite which is forbidden in ultrahigh pressure-high temperature (UHP-HT) metamorphic complexes. Disordered graphite in coesite inclusions is optically undetectable and has been identified exclusively by Raman spectroscopy. Raman imaging of the forbidden coesite-disordered graphite assemblage fails to detect bands assigned to fluid components (e.g. CO2, N2, CH4, H2Oliq), but the Raman spectra of fluid inclusions in kyanite, garnet and quartz demonstrate the presence of CO2, N2, CH4, H2Oliq and disordered graphite. The disordered graphite most likely formed by precipitation from a C―O―H fluid during the retrograde stage. The fluid was entrapped by kyanite with coesite inclusions near the peak metamorphic conditions. The lack of disordered graphite around diamond crystals in our samples does not support the generally accepted origin of disordered graphite in ultra high pressure metamorphic rocks by partial diamond graphitization during exhumation. Copyright © 2017 John Wiley & Sons, Ltd. Copyright © 2017 John Wiley & Sons, Ltd.
Издание
Журнал: Journal of Raman Spectroscopy
Выпуск журнала: Vol. 48, Is. 11
Номера страниц: 1606-1612
ISSN журнала: 03770486
Издатель: John Wiley and Sons Ltd
Персоны
- Shchepetova O.V. (Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Science 3, Ac. Koptyuga ave., Novosibirsk, Russian Federation, Novosibirsk State University, Pirogova st. 2, Novosibirsk, Russian Federation)
- Korsakov A. (Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Science 3, Ac. Koptyuga ave., Novosibirsk, Russian Federation, Novosibirsk State University, Pirogova st. 2, Novosibirsk, Russian Federation)
- Mikhailenko D. (Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Science 3, Ac. Koptyuga ave., Novosibirsk, Russian Federation, Novosibirsk State University, Pirogova st. 2, Novosibirsk, Russian Federation)
- Zelenovskiy P. (School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russian Federation)
- Shur V. (School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russian Federation)
- Ohfuji H. (Geodynamics Research Center (GRC), Ehime University, Matsuyama, Japan)
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