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Article

NMR Spectral Characteristics of Ultrahigh Pressure High Temperature Impact Glasses of the Giant Kara Crater (Pay-Khoy, Russia)

1
Institute of Geology, FRC Komi Science Center, Ural Branch, Russian Academy of Sciences, 167982 Syktyvkar, Russia
2
Center for Magnetic Resonance, Research Park, St. Petersburg State University, 198504 St. Petersburg, Russia
3
Institute of Chemistry, St. Petersburg State University, 198504 St. Petersburg, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Luis Sánchez-Muñoz and Pierre Florian
Minerals 2021, 11(12), 1418; https://doi.org/10.3390/min11121418
Received: 15 November 2021 / Revised: 9 December 2021 / Accepted: 13 December 2021 / Published: 15 December 2021
(This article belongs to the Special Issue NMR Spectroscopy in Mineralogy and Crystal Structures)
In this study, we carried out the analysis of the impact melt vein glasses from the Kara impact crater (Russia) in comparison to low-pressure impact melt glasses (tektites) of the Zhamanshin crater (Kazakhstan). 27Al, 23Na, and 29Si MAS NMR spectra of the samples of these glasses were analyzed. The samples of the natural glass contained inclusions of crystalline phases, paramagnetic elements that greatly complicate and distort the NMR signals from the glass phase itself. Taking into account the Mossbauer distribution of Fe in these glasses, the analysis of the spectra of MAS NMR of glass network-former (Si, Al) and potential network-modifiers (Na) of nuclei leads to the conclusion that the Kara impact melt vein glasses are characterized by complete polymerization of (Si,Al)O4 tetrahedral structural units. The NMR features of the glasses are consistent with the vein hypothesis of their formation under conditions of high pressures and temperatures resulting in their fluidity, relatively slow solidification with partial melt differentiation, polymerization, and precipitation of mineral phases as the impact melt cools. The 70 Ma stability of the Kara impact vein glass can be explained by the stabilization of the glass network with primary fine-dispersed pyroxene and coesite precipitates and by the high polymerization level of the impact glass. View Full-Text
Keywords: ultrahigh-pressure high-temperature impact glasses; Kara impact crater; MAS NMR; alumosilicate glass framework ultrahigh-pressure high-temperature impact glasses; Kara impact crater; MAS NMR; alumosilicate glass framework
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MDPI and ACS Style

Lyutoev, V.; Shumilova, T.; Mazur, A.; Tolstoy, P. NMR Spectral Characteristics of Ultrahigh Pressure High Temperature Impact Glasses of the Giant Kara Crater (Pay-Khoy, Russia). Minerals 2021, 11, 1418. https://doi.org/10.3390/min11121418

AMA Style

Lyutoev V, Shumilova T, Mazur A, Tolstoy P. NMR Spectral Characteristics of Ultrahigh Pressure High Temperature Impact Glasses of the Giant Kara Crater (Pay-Khoy, Russia). Minerals. 2021; 11(12):1418. https://doi.org/10.3390/min11121418

Chicago/Turabian Style

Lyutoev, Vladimir, Tatyana Shumilova, Anton Mazur, and Peter Tolstoy. 2021. "NMR Spectral Characteristics of Ultrahigh Pressure High Temperature Impact Glasses of the Giant Kara Crater (Pay-Khoy, Russia)" Minerals 11, no. 12: 1418. https://doi.org/10.3390/min11121418

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