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Coordinates: 7°43′S 46°39′W / 7.717°S 46.650°W / -7.717; -46.650
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'''Riachão Ring''' is a [[meteorite]] [[impact crater|crater (astrobleme)]] in [[Brazil]].
{{Short description|Meteorite impact crater in Brazil}}
{{Infobox terrestrial impact site
⚫
| name = Riachão Ring
| other_name =
| photo = Riachão Ring LC08 L1TP 221065 20170606 20170616 01 T1.jpg
| photo_size =
| photo_alt =
| photo_caption = [[Landsat Program|Landsat]] image of the Riachão Ring (2017)
| map = Brazil
| map_alt =
| map_caption = Location of the crater in Brazil
| map_size =
| location = [[Parnaíba Basin]]
| label =
| label_position =
⚫
| coordinates = {{coord|7|43|S|46|39|W|region:BR-MA_type:landmark_scale:50000|display=inline,title}}
| coordinates_ref =
| confidence = Confirmed
| diameter = {{convert|4.5|km|mi|abbr=on}}
| depth =
| rise =
| imp_size =
| age = <200 Ma
| exposed = Yes
| drilled = No
| bolide =
| translation =
| language =
| pronunciation =
| topo =
| access =
| country = [[Brazil]]
| state = [[Maranhão]]
| province =
| district =
| municipality =
}}


It is 4.5 km in diameter and the age is estimated to be less than 200 million years ([[Jurassic]] or younger). The crater is exposed at the surface.<ref>{{cite Earth Impact DB | name = Riachão Ring| linkname = riachao-ring| accessdate = 2009-08-16}}</ref>
'''Riachão Ring''' is a [[meteorite]] [[impact crater]] in [[Brazil]]. It lies within the [[Parnaíba Basin]]. It is {{convert|4.5|km|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.<ref name=EIDBRiachaoRing>{{cite Earth Impact DB |name=Riachão Ring |linkname=riachaoring |accessdate=2017-10-09}}</ref>


The structure was first identified from analysis of orbital photographs acquired during the [[Apollo–Soyuz]] Test Project in 1975.<ref>R. S. Dietz and J. F. McHone, 1977, Volcanic Landforms and Astroblemes. In ''Apollo–Soyuz Test Project Summary Science Report, Volume II, Earth Observations and Photography'' Edited by Farouk El-Baz and D. M. Warner. Prepared by NASA Lyndon B. Johnson Space Center. NASA Special Publication 412.</ref> A reconnaissance investigation of the structure was reported by J. F. McHone in 1977.<ref>J. F. McHone, 1977, Riachão Ring, Brazil: A Possible Meteorite Crater Discovered by the Apollo Astronauts. In ''Apollo–Soyuz Test Project Summary Science Report, Volume II, Earth Observations and Photography'' Edited by Farouk El-Baz and D. M. Warner. Prepared by NASA Lyndon B. Johnson Space Center. NASA Special Publication 412.</ref> The structure of the site (dipping [[breccia]] along the rim) supported interpretation of an impact origin, but no [[shatter cone]]s or [[shocked quartz]] were found at the time.
⚫
==References==
<references/>


The crater is severely eroded and there is apparently no [[ejecta]] remaining. The crater rim rises about {{convert|50|m|ft}} above the surrounding surface, and a central uplift is about {{convert|30|m|ft}} above the annular depression within the rim. Shock deformation has been identified in quartz grains within the central uplift.<ref>[https://www.lpi.usra.edu/meetings/lpsc2012/pdf/1511.pdf 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).</ref>
⚫
{{coord|7|43|S|46|39|W|region:BR-MA_type:landmark_scale:50000|display=title}}

<gallery heights="200px" mode="packed">
File:Riachão Ring AST-23-1931.jpg|Part of 1975 discovery photo (AST-23-1931) of the Riachão Ring, by astronauts of the [[Apollo–Soyuz]] Test Project
File:Riachão structure D3C1214-401435A010.jpg|1978 panoramic camera subframe
</gallery>

⚫
== References ==
{{Portal|Brazil|Geology}}
{{reflist}}


{{Impact cratering on Earth}}
{{Impact cratering on Earth}}


{{DEFAULTSORT:Riachao Ring}}
[[Category:Impact craters of Brazil]]
[[Category:Impact craters of Brazil]]
[[Category:Jurassic impact craters]]
[[Category:Jurassic impact craters]]
[[Category:Landforms of Maranhão]]
[[Category:Geology of Brazil]]


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{{brazil-geo-stub}}
⚫
{{regional-geology-stub}}


⚫
{{Maranhão-geo-stub}}
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[[ro:Riachão Ring]]
⚫
{{regional-geology-stub}}

Latest revision as of 15:23, 4 November 2024

Riachão Ring
Landsat image of the Riachão Ring (2017)
Impact crater/structure
ConfidenceConfirmed
Diameter4.5 km (2.8 mi)
Age<200 Ma
ExposedYes
DrilledNo
Location
LocationParnaíba Basin
Coordinates7°43′S 46°39′W / 7.717°S 46.650°W / -7.717; -46.650
CountryBrazil
StateMaranhão
Riachão Ring is located in Brazil
Riachão Ring
Location of the crater in Brazil

Riachão Ring is a meteorite impact crater 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 structure was first identified from analysis of orbital photographs acquired during the Apollo–Soyuz Test Project in 1975.[2] A reconnaissance investigation of the structure was reported by J. F. McHone in 1977.[3] The structure of the site (dipping breccia along the rim) supported interpretation of an impact origin, but no shatter cones or shocked quartz were found at the time.

The crater is severely eroded and there is apparently no ejecta remaining. The crater rim rises about 50 metres (160 ft) above the surrounding surface, and a central uplift is about 30 metres (98 ft) above the annular depression within the rim. Shock deformation has been identified in quartz grains within the central uplift.[4]

  • Part of 1975 discovery photo (AST-23-1931) of the Riachão Ring, by astronauts of the Apollo–Soyuz Test Project
    Part of 1975 discovery photo (AST-23-1931) of the Riachão Ring, by astronauts of the Apollo–Soyuz Test Project
  • 1978 panoramic camera subframe
    1978 panoramic camera subframe

References

[edit]
  1. ^ "Riachão Ring". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2017-10-09.
  2. ^ R. S. Dietz and J. F. McHone, 1977, Volcanic Landforms and Astroblemes. In Apollo–Soyuz Test Project Summary Science Report, Volume II, Earth Observations and Photography Edited by Farouk El-Baz and D. M. Warner. Prepared by NASA Lyndon B. Johnson Space Center. NASA Special Publication 412.
  3. ^ J. F. McHone, 1977, Riachão Ring, Brazil: A Possible Meteorite Crater Discovered by the Apollo Astronauts. In Apollo–Soyuz Test Project Summary Science Report, Volume II, Earth Observations and Photography Edited by Farouk El-Baz and D. M. Warner. Prepared by NASA Lyndon B. Johnson Space Center. NASA Special Publication 412.
  4. ^ 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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