The Suavjarvi Structure: an Early Proterozoic Impact Site on the Fennoscandian Shield
Abstract
Due to special investigations carried out in the eastern part of Fennoscandian shield, 9 objects which possibly represent the deeply eroded ancient (pre-Vendian) impact structures were distinguished there. For the one of these, the Suavjarvi, the discovery of shock features, combined with cosmic imagery, gravity and magnetic evidences, and occurrence of specific polymict breccia, gave proofs of its impact origin. The structure which is transformed intensely by consequent regional metamorphism and erosion is about 16 km in diameter, and its age is estimated to be about 2.4 b.y.
- Publication:
-
Lunar and Planetary Science Conference
- Pub Date:
- March 1996
- Bibcode:
- 1996LPI....27..825M
- Keywords:
-
- CRATERS: IMPACT;
- PLANAR FEATURES;
- PRECAMBRIAN;
- SHOCK METAMORPHISM