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

 

Colônia

Crater Name
Location
Latitude
Longitude
Diameter (km)
Age (Ma)*
Exposed
Drilled
Target Rock**
Bolide Type***
Colônia
Brazil
S 23° 52'
W 46° 43'
3.6
>5, <36
Y
Y
M
-

Morphological aspects of the Colônia impact crater (extracted by Velázquez et al., 2013)

Digital elevation model for the Colônia impact crater on the basis of SRTM data (courtesy of Velázquez, V.F.)

 

References
Kollert, R., Björnberg, A. and Davino, A., Estudos preliminaries de uma depressão circular na região de Colônia: Santo Amaro, São Paulo. Boletim da Sociedade Brasileira de Geologia, v. 3(10), pp. 57-77, 1961.
Masero, W.C.B. and Fontes, S.L., Geoelectrical studies of the Colônia impact structure, Santo Amaro, State of São Paulo – Brazil. Revista Brasileira de Geofísica, v. 10(5), pp. 25-41, 1992.
Motta, U.S. and Flexor, J. -M., Estudo gravimétrico da depressão circular de Colônia, São Paulo, Brasil. II Congresso Internacional da Sociedade Brasileira de Geofísica, Anais, Salvador, Bahia, pp.140-142, 1991.
Neves, F.A., Estudo da depressão circular de Colônia, SP, pelo método sísmico. Revista Brasileira de Geociências, v. 28(1), pp. 3-10, 1998.
Riccomini, C., Crosta, A.P., Prado, R.L., Ledru, M.-P, Turcq, B.J., Sant’Anna, L.G., Ferrari, J.A. and Reimold, W.U. The Colônia structure, São Paulo, Brazil. Meteoritics & Planetary Science, v. 46(11), pp. 1630–1639, 2011.
Velázquez, V.F., Riccomini, C., Azevedo Sobrinho, J.M., Pletsch, M.A.J.S., Sallun, A.E.M., Sallun Filho, W., Hachiro, J. Evidence of shock metamorphism effects in allochthonous breccia deposits from the Colônia Crater, São Paulo, Brazil. International Journal of Geosciences, v. 4(1A), pp. 274-282, 2013.

 

* 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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