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Name

ROCHECHOUART

StatusConfirmed
Country France
CoordinatesLat. N 45°50' Long.E 0°56'
Diameter km 23.0
Age Ma or date 214.0 ±8.0
Synonyms Chassenon
Remarks

Description by Frédéric Michaud:

The intrigating breccias have been analysed since the early XIXth century but attributed to an extinct volcano or some kind hydrologic event. The impact origin has been prooven in 1969 by François Kraut in association with Bevan M. French, and further studied in details by Philippe Lambert. The crater is deeply eroded. It is the first impact crater that has been found while no topographic structures are visible. The diameter is ranging from 18 to 25 km. The dating lies near or at the Triassic-Jurassic boundary between 298 and 186 My. The most recent (2009) analyse is yielding to an age of 201.4 +/- 2.4 My for sanidine samples and 200..5 +/- 2.2 My for adularia samples (2009), though the official date is 214.0 +/- 8.0 My.

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References
Chèvremont 1996 Chèvremont, P., Floc'h J.P. et al., ''Carte géologique de la France à 1/50 000, feuille Rochechouart et notice explicative''. Éditions du BRGM, Service géologique national (1996)
CoM 1985 Graham, Bevan and Hutchison, ''Catalogue of Meteorites'', 4th Edition, (1985).
Fredriksson 1973b Fredriksson K., Nelen J., Noonan A., "Lunar, Terrestrial and Meteoritic Impact Breccias", LSC IV abstracts p.263-265 (1973)
Hodge 1994 Hodge, Paul W., ''Meteorite craters and impact structures of the Earth'', book, 122 pp, Cambridge University Press (1994)
Kraut 1969 Kraut F. et al., Meteoritics, vol.4, p.190 (1969)
Schmidt 2009 Schmidt G.,"Refractory Element Fractionation (Os/Ir, Rh/Ir, Ru/Os) in Impact Craters: Projektile Identification of Rochechouart, Sääksjärvi, Boltysh, Dellen, Mien, Etc.", abstract 5001, 72nd Annual Meteoritical Society Meeting (2009)
Simonds 1977 Simonds C.H., Phinney W.C. and Warner J.L., "Effect of Water on Cratering: A Review of Craters and Impactities on the Earth, Moon and Mars", LSC VIII abstracts p.874-876 (1977)
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