Silica Polymorphs Formation in the Jänisjärvi Impact Structure: Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite
The study of silica polymorphs in impactites is important for determining the pressure and temperature of impact rock formation. Silica modifications in impact melt rocks of the Janisjärvi impact structure (Karelia, Russia) are presented by tridymite, cristobalite, quartz, trace stishovite and coesi...
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ftdoajarticles:oai:doaj.org/article:e49ef2e498254760b39c5670e4946c13 2023-06-11T04:13:37+02:00 Silica Polymorphs Formation in the Jänisjärvi Impact Structure: Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite Daria A. Zamiatina Dmitry A. Zamyatin Georgii B. Mikhalevskii Nikolai S. Chebikin 2023-05-01T00:00:00Z https://doi.org/10.3390/min13050686 https://doaj.org/article/e49ef2e498254760b39c5670e4946c13 EN eng MDPI AG https://www.mdpi.com/2075-163X/13/5/686 https://doaj.org/toc/2075-163X doi:10.3390/min13050686 2075-163X https://doaj.org/article/e49ef2e498254760b39c5670e4946c13 Minerals, Vol 13, Iss 686, p 686 (2023) tridymite cristobalite ballen quartz trace stishovite trace coesite impact melt rock Mineralogy QE351-399.2 article 2023 ftdoajarticles https://doi.org/10.3390/min13050686 2023-05-28T00:33:29Z The study of silica polymorphs in impactites is important for determining the pressure and temperature of impact rock formation. Silica modifications in impact melt rocks of the Janisjärvi impact structure (Karelia, Russia) are presented by tridymite, cristobalite, quartz, trace stishovite and coesite. Silica modifications were characterized and studied by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and Raman and cathodoluminescent spectroscopy. Investigations were carried out in order to clarify polymorphs formation mechanisms and search for signs of the transition of certain structural modifications to others. For the first time, a description of tridymite with a ballen-like texture from impact melt rock is given. A sequence of silica modification and textural transformation in impact rocks after the impact event is suggested. We conclude that the pressure of 40 GPa and a temperature of more than 900 °C were achieved in the impact structure. Article in Journal/Newspaper karelia* Directory of Open Access Journals: DOAJ Articles Ballen ENVELOPE(10.589,10.589,64.870,64.870) Jänisjärvi ENVELOPE(28.747,28.747,69.591,69.591) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
tridymite cristobalite ballen quartz trace stishovite trace coesite impact melt rock Mineralogy QE351-399.2 |
spellingShingle |
tridymite cristobalite ballen quartz trace stishovite trace coesite impact melt rock Mineralogy QE351-399.2 Daria A. Zamiatina Dmitry A. Zamyatin Georgii B. Mikhalevskii Nikolai S. Chebikin Silica Polymorphs Formation in the Jänisjärvi Impact Structure: Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite |
topic_facet |
tridymite cristobalite ballen quartz trace stishovite trace coesite impact melt rock Mineralogy QE351-399.2 |
description |
The study of silica polymorphs in impactites is important for determining the pressure and temperature of impact rock formation. Silica modifications in impact melt rocks of the Janisjärvi impact structure (Karelia, Russia) are presented by tridymite, cristobalite, quartz, trace stishovite and coesite. Silica modifications were characterized and studied by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and Raman and cathodoluminescent spectroscopy. Investigations were carried out in order to clarify polymorphs formation mechanisms and search for signs of the transition of certain structural modifications to others. For the first time, a description of tridymite with a ballen-like texture from impact melt rock is given. A sequence of silica modification and textural transformation in impact rocks after the impact event is suggested. We conclude that the pressure of 40 GPa and a temperature of more than 900 °C were achieved in the impact structure. |
format |
Article in Journal/Newspaper |
author |
Daria A. Zamiatina Dmitry A. Zamyatin Georgii B. Mikhalevskii Nikolai S. Chebikin |
author_facet |
Daria A. Zamiatina Dmitry A. Zamyatin Georgii B. Mikhalevskii Nikolai S. Chebikin |
author_sort |
Daria A. Zamiatina |
title |
Silica Polymorphs Formation in the Jänisjärvi Impact Structure: Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite |
title_short |
Silica Polymorphs Formation in the Jänisjärvi Impact Structure: Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite |
title_full |
Silica Polymorphs Formation in the Jänisjärvi Impact Structure: Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite |
title_fullStr |
Silica Polymorphs Formation in the Jänisjärvi Impact Structure: Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite |
title_full_unstemmed |
Silica Polymorphs Formation in the Jänisjärvi Impact Structure: Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite |
title_sort |
silica polymorphs formation in the jänisjärvi impact structure: tridymite, cristobalite, quartz, trace stishovite and coesite |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/min13050686 https://doaj.org/article/e49ef2e498254760b39c5670e4946c13 |
long_lat |
ENVELOPE(10.589,10.589,64.870,64.870) ENVELOPE(28.747,28.747,69.591,69.591) |
geographic |
Ballen Jänisjärvi |
geographic_facet |
Ballen Jänisjärvi |
genre |
karelia* |
genre_facet |
karelia* |
op_source |
Minerals, Vol 13, Iss 686, p 686 (2023) |
op_relation |
https://www.mdpi.com/2075-163X/13/5/686 https://doaj.org/toc/2075-163X doi:10.3390/min13050686 2075-163X https://doaj.org/article/e49ef2e498254760b39c5670e4946c13 |
op_doi |
https://doi.org/10.3390/min13050686 |
_version_ |
1768390834360680448 |