manicouagan

Brent

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Brent  Ontario, Canada  N 46° 5'  W 78° 29'  3.8  452.8 +/- 2.7  N  Y  C  Chondrite
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1 & 2. Aerial Photograph

3. DEM

4. (a) Simplified regional geology showing the location of the Brent impact structure. Modified after Bleeker at al. (2011), and (b) Geological map of Brent impact structure with location of drill cores. After McGregor et al. (2020)

5. Cross section profile of the Brent impact structure (McGregor et al., 2020)

References
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Allen, C. C., Gooding, J.L. and Keil,K., Hydrothermally altered impact melt from Brent and Ries craters (abstract). Lunar and Planetary Science XII, pp. 16-18. 1981.
Basilevsky, A. T., Fel'dman, V.I., Kapustkina, I.G. and Kolesov,G.M., On the distribution of iridium in the rocks of terrestrial impact craters (in Russian). Geokhimiya, v. 6, pp. 781-790. 1984.
Basilevsky, A. T., Florenskiy, K.P., Yakovlev, O.I., Ivanov, B.A., Fel'dman, V.I. and Granovskiy,I.B., Transformation of planetary material in high-speed collisions (in Russian). Geokhimiya, v. 7, pp. 946-960. 1982.
Beals, C. S., Terrestrial meteorite craters and their lunar counterparts. Ottawa Dominion Observatory Contributions, v. 7, pp. 1-10. 1967.
Beals, C. S., Innes, M.J.S. and Rottenberg,J.A., Fossil meteorite craters. Middlehurst, B.M. and Kuiper, G.P., eds., The Moon, Meteorites and Comets, University of Chicago Press, Chicago, v. IV, pp. 235-284. 1963.
Beals, C. S., Innes, M.J.S. and Rottenberg,J.A., The search for fossil meteorite craters. Ottawa Dominion Observatory Contributions, v. 4, pp. 1-31. 1960.
Beals, C. S., Fossil meteorite craters. Scientific American, v. 199, pp. 32-39. 1958.
Beck, A. E., Hamza, V.M. and Chang,C.C., Analysis of heat flow data correlation of thermal resistivity and shock metamorphic grade and its use as evidence for an impact origin of the Brent crater. Canadian Journal of Earth Sciences, v. 13, pp. 929-936. 1976.
Beck, A. E., Logis, Z., Terrestrial flow of heat in the Brent crater. Nature, v. 201, p. 383. 1964.
Bleeker, W., Dix, G. R., Davidson, A., LeCheminant, A., Tectonic evolution and sedimentary record of the Ottawa-Bonnechere Graben: Examining the Precambrian and Phanerozoic history of magmatic activity, faulting and sedimentation. GACMAC 2011 Field Trip Guidebook. 2011
Chavez, R. E., An optimisation study of gravity data from the Brent crater, Ontario, Canada. First Break, v. 4, pp. 19-22. 1986.
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Gold, D. P., A study of quartz subfabrics from the Brent crater, Ontario. French, B.M. and Short, N.M., eds., Shock Metamorphism of Natural Materials, Mono Book Corp., Baltimore, MD, pp. 495-508. 1968.
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Grieve, R. A. F., The melt rocks at Brent crater, Ontario, Canada. Proceedings Lunar and Planetary Science Conference 9th, pp. 2579-2608. 1978.
Grieve, R. A. F., The petro-chemistry of the melt rocks at Brent crater and their implications for the conditions of impact (abstract). Meteoritics, v. 13, pp. 484-486. 1978.
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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)