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Tenoumer crater: Difference between revisions

Coordinates: 22°55′5″N 10°24′27″W / 22.91806°N 10.40750°W / 22.91806; -10.40750
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The crater is exposed at the surface and is nearly circular. Edges of the crater rise up to {{cvt|110|m||}} high above the base of the crater, but the bottom of the crater is covered with approximately {{cvt|200|to|300|m}} thick layer of sediments.{{citation needed|date=August 2019}}
The crater is exposed at the surface and is nearly circular. Edges of the crater rise up to {{cvt|110|m||}} high above the base of the crater, but the bottom of the crater is covered with approximately {{cvt|200|to|300|m}} thick layer of sediments.{{citation needed|date=August 2019}}


Tenoumer crater has formed in [[gneiss]] and [[granite]] of [[Precambrian]] [[peneplain]] with a thin layer of [[Pliocene]] sediments (no older). The crater is believed to be caused by an impact event due to basement rocks found outside the crater. A volcanic origin was once theorized] because of the discovery of [[basalt]] and [[rhyodacite]] outside of the crater basin,<ref>[http://www.wondermondo.com/Countries/Af/Mauritania/TirisZemmour/Tenoumer.htm METEORITE OR VOLCANO?]</ref> but current evidence clearly indicates an impact origin.<ref>{{cite web |author=Brügge, Norbert |url=http://www.b14643.de/Sahara/Mauritania%20Craters/index.htm |title=The "impact" craters of Mauritania: Aouelloul, Tenoumer, Temimichat and El Mrayer |url-status=dead |archiveurl=https://web.archive.org/web/20100223024521/http://www.b14643.de/Sahara/Mauritania%20Craters/index.htm |archivedate=2010-02-23 }}</ref>
Tenoumer crater has formed in [[gneiss]] and [[granite]] of [[Precambrian]] [[peneplain]] with a thin layer of [[Pliocene]] sediments (no older). The crater is believed to be caused by an impact event due to basement rocks found outside the crater. A volcanic origin was once theorized because of the discovery of [[basalt]] and [[rhyodacite]] outside of the crater basin,<ref>[http://www.wondermondo.com/Countries/Af/Mauritania/TirisZemmour/Tenoumer.htm METEORITE OR VOLCANO?]</ref> but current evidence clearly indicates an impact origin.<ref>{{cite web |author=Brügge, Norbert |url=http://www.b14643.de/Sahara/Mauritania%20Craters/index.htm |title=The "impact" craters of Mauritania: Aouelloul, Tenoumer, Temimichat and El Mrayer |url-status=dead |archiveurl=https://web.archive.org/web/20100223024521/http://www.b14643.de/Sahara/Mauritania%20Craters/index.htm |archivedate=2010-02-23 }}</ref>
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Revision as of 05:49, 15 March 2021

Tenoumer crater
Impact crater/structure
ConfidenceConfirmed
Diameter1.9 km (1.2 mi)
Depth
  • 110 m (360 ft) (currently exposed)
  • 300 to 400 m (980 to 1,310 ft) (originally)
Age21,400 ± 9,700
Location
Coordinates22°55′5″N 10°24′27″W / 22.91806°N 10.40750°W / 22.91806; -10.40750
CountryMauritania
Tenoumer crater is located in Africa
Tenoumer crater
Tenoumer crater
Asteroid impact location in Africa

Tenoumer is considered to be an impact crater in Mauritania.[1]

Landsat image of the Tenoumer crater; screen capture from NASA World Wind
Oblique Landsat image of Tenoumer crater draped over digital elevation model (x3 vertical exaggeration); screen capture from NASA World Wind

Details

The crater is located in the western Sahara Desert. It is 1.9 km (1.2 mi) in diameter and its age is estimated to be 1.57 ± 0.14 million years old.[2]

The crater is exposed at the surface and is nearly circular. Edges of the crater rise up to 110 m (360 ft) high above the base of the crater, but the bottom of the crater is covered with approximately 200 to 300 m (660 to 980 ft) thick layer of sediments.[citation needed]

Tenoumer crater has formed in gneiss and granite of Precambrian peneplain with a thin layer of Pliocene sediments (no older). The crater is believed to be caused by an impact event due to basement rocks found outside the crater. A volcanic origin was once theorized because of the discovery of basalt and rhyodacite outside of the crater basin,[3] but current evidence clearly indicates an impact origin.[4]

References

  1. ^ "Tenoumer". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-16.
  2. ^ Schultze, Dina Simona; Jourdan, Fred; Hecht, Lutz; Reimold, Wolf Uwe; Ralf-Thomas, Schmitt (2016). "Tenoumer impact crater, Mauritania: Impact melt genesis from a lithologically diverse target" (PDF). Meteoritics and Planetary Science. 51 (2). The Meteoritical Society: 323–350. Bibcode:2016M&PS...51..323S. doi:10.1111/maps.12593.
  3. ^ METEORITE OR VOLCANO?
  4. ^ Brügge, Norbert. "The "impact" craters of Mauritania: Aouelloul, Tenoumer, Temimichat and El Mrayer". Archived from the original on 2010-02-23.
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