Riachão Ring
| Riachão Ring | |
|---|---|
 Landsat image of the Riachão Ring | |
| Impact crater/structure | |
| Confidence | Confirmed |
| Diameter | 4.5 km (2.8 mi) |
| Age | <200 Ma |
| Exposed | Yes |
| Drilled | No |
| Location | |
| Location | Parnaíba Basin |
| Coordinates | 7°43′S 46°39′W / 7.717°S 46.650°W |
| Country | Brazil |
| State | Maranhão |
  Location of the crater in Brazil | |
Riachão Ring is a meteorite crater (astrobleme) in Brazil. It lies ]].within the Parnaíba Basin.
It is 4.5 kilometres (2.8 mi) in diameter and the age is estimated to be less than 200 million years (Jurassic or younger). The crater is exposed at the surface.[1]
The crater is severely eroded and there is apparently no ejecta remaining. The crater rim rises about 50 m above the surrounding surface, and a central uplift is about 30 m above the annular depression within the rim. Shock deformation has been identified in quartz grains within the central uplift.[2]
References
- ^ "Riachão Ring". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2017-10-09.
- ^ THE RIACHÃO RING IMPACT STRUCTURE, NORTHEASTERN BRAZIL: RE-EVALUATION OF ITS STRATIGRAPHY AND EVIDENCE FOR IMPACT, M. V. Maziviero, M. A. R. Vasconcelos, A. M. Góes, A. P. Crósta, and W. U. Reimold. 43rd Lunar and Planetary Science Conference (2012).
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