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Earth Impact Database Sorted by : | Name | Diameter | Age |

 

Granby

Crater Name
Location
Latitude
Longitude
Diameter (km)
Age (Ma)*
Exposed
Drilled
Target Rock**
Bolide Type***
Granby
Sweden
N 58° 25'
E 14° 56'
3
~ 470
N
Y
M
-

 

References
Alwmark, C. Shocked quartz grains in the polymict breccia of the Granby Structure, Sweden; verification of an impact. Meteoritics & Planetary Science, vol.44, pp.1107. 2009.
Grahn, Y., Nolvak, J and Paris,F., Precise chitinozoan dating of Ordovician impact events in Baltoscandia, Journal of Micropalaeontology, v.15, p.21-35. 1996.
Grahn, Y., Nolvak, J., Chitinozoan dating of Ordovician impact events in Sweden and Estonia. A preliminary note. Geologiska Föreningens I Stockholm Förhandlingar, v. 115, pp. 263-264. 1993.
Henkel, H., Ekneligoda, T.C., and Aaro, S. The extent of impact induced fracturing from gravity modeling of the Granby and Tvaren simple craters. Tectonophysics, vol.485, pp.290. 2010.
Henkel, H., Pesonen, L. J., Impact craters and craterform structures in Fennoscandia. Tectonophysics, v. 216, pp. 31-40. 1992.
Lindström, M., Ormö, J., Sturkell, E.F.F. and Törnberg,R., Geological information from Ordovician marine impact craters (abstract). GFF, v. 118, pp. A99-A100. 1996.
Ormo, J., Lindstrom, M., When a cosmic impact strikes the sea bed, Geol. Mag. V.137(1), p.67-80. 2000.

 

* 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)

 

 

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