manicouagan

Lockne

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Lockne  Sweden  N 63° 0'  E 14° 49'  7.5  ~ 458  Y  Y  M  -

NOTE: The diameter of Lockne is here quoted as 7.5 km, the diameter of the structure within the crystalline basement. The wider 13.5 km diameter structure in the overlying supracrustal sedimentary rocks is believed by some researchers to also have formed by primary excavation flow, and thus could be interpreted as the diameter (Ormo, pers comm).

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1. Photograph - view towards south

2. Geological block diagram

References
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* pre-1977 K-Ar, Ar-Ar and Rb-Sr ages recalculated using the decay constants of Steiger and Jager (1977) Ages in millions of years (Ma) before present.

** Abbreviations: C - Crystalline Target; C-Ms - Metasedimentary Target; M - Mixed Target (i.e.sedimentary strata overlying crystalline basement); S - sedimentary target (i.e. no crystalline rocks affected by the impact event). From Osinski. G. R., Spray J. G., and Grieve R. A. F. 2007. Impact melting in sedimentary target rocks: A synthesis. In The Sedimentary Record of Meteorite Impacts, Geological Society of America Special Paper. Editors: Evans K. Horton W., King D., Morrow J., and Warme J. Geological Society of America: Boulder, in press.

***From Koeberl,C. Identification of meteoritic components in impactites. 1998, Koeberl, C. The Geochemistry and Cosmochemistry of Impacts. 2007 and PASSC Files. (IAB, IIIAB, IIIB, IIID - Iron Meteorite)