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

 

Santa Marta

Crater Name
Location
Latitude
Longitude
Diameter (km)
Age (Ma)*
Exposed
Drilled
Target Rock**
Bolide Type***
Santa Marta
Brazil
S 10°10'
W 45° 15'
10
66-100
Y
N
M
-

 

References
De Oliveira, G. J. G., Vasconcelos, M. A. R., Crósta, A. P., Reimold, W. U., Góes, A. M., and Kowitz, A. 2014. Shatter cones and planar deformation features confirm Santa Marta in Piauí State, Brazil, as an impact structure. Meteoritics & Planetary Science, 49(10), 1915–1928. doi:10.1111/maps.12368
Vasconcelos, M.A.R., Crosta, A.P., and Molina, E.C. Geophysical characteristics of four possible impact structures in the Parnaiba Basin, Brazil; comparison and implications. Special Paper - Geological Society of America, vol. 465, pp.201. 2010.

 

* 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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