manicouagan

Vista Alegre

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Targed Rock**  Bolid Type***
 Vista Alegre  Brazil  S 25° 57'  W 52° 41'  9.5  < 65  Y  N  -  -
error
error
error

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)