Boltish Impact Structure and its impact-melting rocks
The Boltysh crater in the central part of the Ukrainian Shield is a complex impact structure composed by a deep inner crater with a central uplift and a peripheral depression. The powerful annular sheet of impact melt rocks fills the inner crater around the central uplift. Two main types of impact m...
Збережено в:
| Дата: | 2011 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | rus |
| Опубліковано: |
Subbotin Institute of Geophysics of the NAS of Ukraine
2011
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| Онлайн доступ: | https://journals.uran.ua/geofizicheskiy/article/view/116856 |
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| Назва журналу: | Geofizicheskiy Zhurnal |
Репозитарії
Geofizicheskiy Zhurnal| Резюме: | The Boltysh crater in the central part of the Ukrainian Shield is a complex impact structure composed by a deep inner crater with a central uplift and a peripheral depression. The powerful annular sheet of impact melt rocks fills the inner crater around the central uplift. Two main types of impact melt rocks are presented in the sheet: the microporphyric rocks with glassy matrix and rocks with crystalline matrix without any glass. While the glassy matrix melt rocks are the product of solidification of a dry melt, the crystalline matrix melt rocks were formed in the marginal zones of the sheet by interaction with water and water-bearing substances. The age of the Boltysh structure is 65,17 ± 0,64 Ma that is an evidence of its formation at the Cretaceous-Tertiary boundary simultaneously with the Chixhulub crater in Mexico, which caused a mass life extinction at the end of the Mesozoic. |
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