Vista Alegre
Crater Name | Location | Latitude | Longitude | Diameter (km) | Age (Ma) | Exposed | Drilled | Target Rock** | Bolide Type*** |
---|---|---|---|---|---|---|---|---|---|
Vista Alegre | Brazil | S 25° 57' | W 52° 41' | 9.5 | < 65 | Y | N | - | - |
1. Landsat-7/ETM+ image of bands 4, 5 and 3 (in RGB) with the outline of the crater. Image provided courtesy of Alvaro P. Crosta et al (2004)
2. Digital elevation model - looking north. Image provided courtesy of Alvaro P. Crosta et al (2004)
3. Shock features. Image provided courtesy of Alvaro P. Crosta et al (2004)
References |
Crosta, A.P., Koeberl, C., Furuie, R.A. and Kazzuo-Vieira, C., The first description and confirmation of the Vista Alegre impact structure in the Parana flood basalts of southern Brazil. Meteoritics & Planetary Science, v.45, no.2, pp. 181-194. 2010. |
Crosta, A., Kazzuo-Viera, C. and Schrank, A., Vista Alegre: A newly discovered impact crater in Southern Brazil. 67th Annual Meteoritical Society Meeting, Rio de Janeiro, Brazil. Abstract 5051. 2004. |
* 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) |