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- W1506974722 abstract "Abstract– We present the geology and interpreted shock features of the Suavjarvi circular structure. Suavjarvi is a circular feature (illustrated by satellite imagery, topography, and magnetic data) located in the central part of the Karelian Craton (lat. 63°07′N, long. 33°23′E). To date, little information on the geologic and impact features of the Suavjarvi structure is available in the literature. The structure is characterized by gravity and magnetic lows and disruption of the regional magnetic fabric. In the northeastern and southwestern parts of the structure, several erosional remnants of highly disturbed rocks occur referred to as monomict and polymict megabreccia. These comprise blocks of both basement granitoids and supracrustal greenstone rocks. The impact origin of polymict megabreccia and therefore of the Suavjarvi structure is confirmed by observations of closely spaced planar microstructures at angles consistent with planes that have Miller indices indicative of impact shock effects, mostly of ω{10¯13}. The Suavjarvi is considered to be a remnant of a deeply eroded and metamorphosed impact structure, which has a diameter of 16 km and was formed during the Paleoproterozoic (older than 2.2 Ga); this is inferred from the age of the overlying volcanic-sedimentary Jatulian sequence. Suavjarvi underwent regional metamorphism that resulted in obliteration or transformation of shock metamorphic effects. Massive sulfides occur within megabreccia; originating probably from postimpact redeposition of pre-existing mineralization." @default.
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- W1506974722 date "2012-10-01" @default.
- W1506974722 modified "2023-10-18" @default.
- W1506974722 title "The Suavjärvi impact structure, NW Russia" @default.
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- W1506974722 doi "https://doi.org/10.1111/j.1945-5100.2012.01428.x" @default.
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