Petrography of impact glasses and melt breccias from the El'gygytgyn impact structure, Russia
Abstract The El'gygytgyn impact structure, 18 km in diameter and 3.6 Ma old, in Arctic Siberia, Russia, is the only impact structure on Earth mostly excavated in acidic volcanic rocks. The Late Cretaceous volcanic target includes lavas, tuffs, and ignimbrites of rhyolitic, dacitic, and andesiti...
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crwiley:10.1111/maps.12048 2024-09-09T19:26:01+00:00 Petrography of impact glasses and melt breccias from the El'gygytgyn impact structure, Russia Pittarello, Lidia Koeberl, Christian Austrian Science Foundation FWF 2013 http://dx.doi.org/10.1111/maps.12048 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12048 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12048 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 48, issue 7, page 1236-1250 ISSN 1086-9379 1945-5100 journal-article 2013 crwiley https://doi.org/10.1111/maps.12048 2024-07-25T04:24:08Z Abstract The El'gygytgyn impact structure, 18 km in diameter and 3.6 Ma old, in Arctic Siberia, Russia, is the only impact structure on Earth mostly excavated in acidic volcanic rocks. The Late Cretaceous volcanic target includes lavas, tuffs, and ignimbrites of rhyolitic, dacitic, and andesitic composition, and local occurrence of basalt. Although the ejecta blanket around the crater is nearly completely eroded, bomb‐shaped impact glasses, redeposited after the impact event, occur in lacustrine terraces within the crater. Here we present detailed petrographic descriptions of newly collected impact glass‐bearing samples. The observed features contribute to constrain the formation of the melt and its cooling history within the framework of the impact process. The collected samples can be grouped into two types, characterized by specific features: (1) “pure” glasses, containing very few clasts or new crystals and which were likely formed during the early stages of cratering and (2) a second type, which represents composite samples with impact melt breccia lenses embedded in silicate glass. These mixed samples probably resulted from inclusion of unmelted impact debris during ejection and deposition. After deposition the glassy portions continued to deform, whereas the impact melt breccia inclusions that probably had already cooled down behaved as rigid bodies in the flow. Article in Journal/Newspaper Arctic Siberia Wiley Online Library Arctic Meteoritics & Planetary Science 48 7 1236 1250 |
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Wiley Online Library |
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English |
description |
Abstract The El'gygytgyn impact structure, 18 km in diameter and 3.6 Ma old, in Arctic Siberia, Russia, is the only impact structure on Earth mostly excavated in acidic volcanic rocks. The Late Cretaceous volcanic target includes lavas, tuffs, and ignimbrites of rhyolitic, dacitic, and andesitic composition, and local occurrence of basalt. Although the ejecta blanket around the crater is nearly completely eroded, bomb‐shaped impact glasses, redeposited after the impact event, occur in lacustrine terraces within the crater. Here we present detailed petrographic descriptions of newly collected impact glass‐bearing samples. The observed features contribute to constrain the formation of the melt and its cooling history within the framework of the impact process. The collected samples can be grouped into two types, characterized by specific features: (1) “pure” glasses, containing very few clasts or new crystals and which were likely formed during the early stages of cratering and (2) a second type, which represents composite samples with impact melt breccia lenses embedded in silicate glass. These mixed samples probably resulted from inclusion of unmelted impact debris during ejection and deposition. After deposition the glassy portions continued to deform, whereas the impact melt breccia inclusions that probably had already cooled down behaved as rigid bodies in the flow. |
author2 |
Austrian Science Foundation FWF |
format |
Article in Journal/Newspaper |
author |
Pittarello, Lidia Koeberl, Christian |
spellingShingle |
Pittarello, Lidia Koeberl, Christian Petrography of impact glasses and melt breccias from the El'gygytgyn impact structure, Russia |
author_facet |
Pittarello, Lidia Koeberl, Christian |
author_sort |
Pittarello, Lidia |
title |
Petrography of impact glasses and melt breccias from the El'gygytgyn impact structure, Russia |
title_short |
Petrography of impact glasses and melt breccias from the El'gygytgyn impact structure, Russia |
title_full |
Petrography of impact glasses and melt breccias from the El'gygytgyn impact structure, Russia |
title_fullStr |
Petrography of impact glasses and melt breccias from the El'gygytgyn impact structure, Russia |
title_full_unstemmed |
Petrography of impact glasses and melt breccias from the El'gygytgyn impact structure, Russia |
title_sort |
petrography of impact glasses and melt breccias from the el'gygytgyn impact structure, russia |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1111/maps.12048 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12048 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12048 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Siberia |
genre_facet |
Arctic Siberia |
op_source |
Meteoritics & Planetary Science volume 48, issue 7, page 1236-1250 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/maps.12048 |
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Meteoritics & Planetary Science |
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48 |
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7 |
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1236 |
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1250 |
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1809895728429924352 |