Tenoumer crater: Difference between revisions
Content deleted Content added
Link added showing not volcanic origin |
|||
| Line 7: | Line 7: | ||
The crater is located in the western [[Sahara Desert]]. It is 1.9 km in diameter and the age is estimated to be 21,400 ± 9,700 years old, placing it in the [[Pleistocene]] [[Epoch (geology)|epoch]].<ref>{{cite web |url=http://www.lpi.usra.edu/meetings/lpsc2009/pdf/1281.pdf |publisher=Lunar and Planetary Institute |title=40th Lunar and Planetary Science Conference |year=2009 |chapter=Petrographic Investigation of Ejecta from the Tenoumer Impact Crater, Mauritania |last1=Jaret |first1=S. J. |last2=Kah |first2=L. C. |last3=French |first3=B. M. }}</ref><ref>{{cite journal |url=http://www.lpi.usra.edu/meetings/lpsc2009/pdf/1183.pdf |publisher=Lunar and Planetary Institute |title=The Age of Tenoumer Crater, Mauritania, Revisited |year=2003 |volume=XXXIV |last1=Storzer |first1=D. |last2=Selo |first2=M. |last3=Latouche |first3=L. |last4=Fabre |first4=J. }}</ref> |
The crater is located in the western [[Sahara Desert]]. It is 1.9 km in diameter and the age is estimated to be 21,400 ± 9,700 years old, placing it in the [[Pleistocene]] [[Epoch (geology)|epoch]].<ref>{{cite web |url=http://www.lpi.usra.edu/meetings/lpsc2009/pdf/1281.pdf |publisher=Lunar and Planetary Institute |title=40th Lunar and Planetary Science Conference |year=2009 |chapter=Petrographic Investigation of Ejecta from the Tenoumer Impact Crater, Mauritania |last1=Jaret |first1=S. J. |last2=Kah |first2=L. C. |last3=French |first3=B. M. }}</ref><ref>{{cite journal |url=http://www.lpi.usra.edu/meetings/lpsc2009/pdf/1183.pdf |publisher=Lunar and Planetary Institute |title=The Age of Tenoumer Crater, Mauritania, Revisited |year=2003 |volume=XXXIV |last1=Storzer |first1=D. |last2=Selo |first2=M. |last3=Latouche |first3=L. |last4=Fabre |first4=J. }}</ref> |
||
The crater is exposed at the surface and is nearly circular. Edges of the crater rise up to 110 metres high above the base of the crater, but the bottom of the crater is covered with approximately 200 |
The crater is exposed at the surface and is nearly circular. Edges of the crater rise up to 110 metres high above the base of the crater, but the bottom of the crater is covered with approximately 200 – 300 m thick layer of sediments. |
||
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 [http://www.wondermondo.com/Countries/Af/Mauritania/TirisZemmour/Tenoumer.htm was once theorized] because of the discovery of [[basalt]] and [[rhyodacite]] outside of the crater basin, but current evidence clearly indicates an impact origin. |
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 [http://www.wondermondo.com/Countries/Af/Mauritania/TirisZemmour/Tenoumer.htm was once theorized] because of the discovery of [[basalt]] and [[rhyodacite]] outside of the crater basin, but current evidence clearly indicates an impact origin. |
||
Revision as of 19:51, 12 June 2016
Tenoumer is an impact crater in Mauritania.[1]
Details
The crater is located in the western Sahara Desert. It is 1.9 km in diameter and the age is estimated to be 21,400 ± 9,700 years old, placing it in the Pleistocene epoch.[2][3]
The crater is exposed at the surface and is nearly circular. Edges of the crater rise up to 110 metres high above the base of the crater, but the bottom of the crater is covered with approximately 200 – 300 m thick layer of sediments.
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, but current evidence clearly indicates an impact origin.
References
- ^ "Tenoumer". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-16.
- ^ Jaret, S. J.; Kah, L. C.; French, B. M. (2009). "40th Lunar and Planetary Science Conference" (PDF). Lunar and Planetary Institute.
{{cite web}}:|chapter=ignored (help) - ^ Storzer, D.; Selo, M.; Latouche, L.; Fabre, J. (2003). "The Age of Tenoumer Crater, Mauritania, Revisited" (PDF). XXXIV. Lunar and Planetary Institute.
{{cite journal}}: Cite journal requires|journal=(help)
- Brügge, Norbert. "The "impact" craters of Mauritania: Aouelloul, Tenoumer, Temimichat and El Mrayer".
External links
- Nasa - Image of the Day February 17, 2008
- Meteorite impact structures
- Additional Images of Tenoumer crater
22°55′5″N 10°24′27″W / 22.91806°N 10.40750°W
