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  1. 1 Acta Societatis Metheoriticae Polonorum

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  1. 1 2016

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  1. 1 Kosina R.

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Impaktyty struktury Kara, Ural Polarny

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Kosina R.
Acta Societatis Metheoriticae Polonorum
|
2016
|
vol. 7
45-58
EN
The Kara crater is located near the Kara Sea. Together with the Ust-Kara crater, both structures are considered a twin structure, which is rarely found on Earth. The Ust-Kara is an undersea crater, while the Kara was formed in sedimentary rocks, in wet tundra. This environment determines the distinct petrological characteristics of the Kara impactites. Large shatter cones are a characteristic feature of an impact crater. High- and low-temperature tagamites with variable amounts of melt or glass and with the fluidal texture of rocky clasts were described from the crater. The mineralization represented by pyrite and chalcopyrite occurs in the suevite breccias expressing variable amounts of glass fragments. A special feature of the Kara impactites is the presence of coal clasts and carbonate rocks as well as a secondary crystallization of calcite in the form of globules.
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