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Encyclopedia > Richat Structure
Satellite picture of the Richat Structure
Satellite picture of the Richat Structure
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The Richat Structure, a prominent circular feature in the Sahara desert of Mauritania near Ouadane, has attracted attention since the earliest space missions because it forms a conspicuous bull’s-eye in the otherwise rather featureless expanse of the desert. Described by some as looking like an outsized ammonite in the desert, the structure, which has a diameter of almost 50 kilometers (30 miles), has become a landmark for shuttle crews. Initially interpreted as a meteorite impact structure because of its high degree of circularity, it is now thought to be merely a symmetrical uplift (circular anticline or dome) that has been laid bare by erosion. Paleozoic quartzites form the resistant beds outlining the structure. Image File history File linksMetadata Download high-resolution version (3130x2953, 1883 KB)Credit(s): NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team Source: http://asterweb. ... Image File history File linksMetadata Download high-resolution version (3130x2953, 1883 KB)Credit(s): NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team Source: http://asterweb. ... Image File history File links Wiki_letter_w. ... Orders and Suborders Order Ammonitida Ammonitina Acanthoceratina Ancyloceratina Phylloceratina Lytoceratina Order Goniatitida Goniatitina Anarcestina Clymeniina Order Ceratitida Ceratitina Prolecanitina Ammonites are an extinct group of marine animals (subclass Ammonoidea) in the phylum Mollusca and class Cephalopoda. ... NASAs Space Shuttle, officially called Space Transportation System (STS), is the United States governments current manned launch vehicle. ... Willamette Meteorite A meteorite is a natural object originating in outer space that survives an impact with the Earths surface without being destroyed. ... Anticline with syncline visible at far right- USGS In structural geology, an anticline is a Fold (geology) that is convex to the youngest beds—youngest sediments are on back of hand, older under the palm. ... In geology, a dome is a deformational feature consisting of symmetrically-dipping anticlines; their general outline on a geologic map is circular or oval. ... Severe soil erosion in a wheat field near Washington State University, USA. For erosion as understood by materials science, see Erosion (materials science) For erosion as an English analogy, see Erosion (figurative) For erosion as an operation of Mathematical morphology, see Erosion (morphology) Erosion is the displacement of solids (soil... The Paleozoic Era (from the Greek palaio, old and zoion, animals, meaning ancient life) is the earliest of three geologic eras of the Phanerozoic eon. ... Quartzite Quartzite is a hard, metamorphic rock which was originally sandstone. ...

A topographic reconstruction (scaled 6:1 on the vertical axis) from satellite photos. False coloring as follows: bedrock=brown, sand=yellow/white, vegetation=green, salty sediments=blue
A topographic reconstruction (scaled 6:1 on the vertical axis) from satellite photos. False coloring as follows: bedrock=brown, sand=yellow/white, vegetation=green, salty sediments=blue

Original entry was from the NASA Earth Observatory; [1] Image File history File links Download high resolution version (2259x1244, 495 KB) PIA04963: Richat Structure, Mauritania, Perspective View, Landsat Image over SRTM Elevation Source: http://photojournal. ... Image File history File links Download high resolution version (2259x1244, 495 KB) PIA04963: Richat Structure, Mauritania, Perspective View, Landsat Image over SRTM Elevation Source: http://photojournal. ... NASA Earth Observatory is an online publication of NASA where the public can access satellite imagery and scientific information about our planet for free. ...


Further reading

  • Guillaume Matton, Michel Jébrak and James K.W. Lee (August 2005). "Resolving the Richat enigma: Doming and hydrothermal karstification above an alkaline complex". Geology 33 (8): 665-668. DOI:10.1130/G21542.1. 

A digital object identifier (or DOI) is a standard for persistently identifying a piece of intellectual property on a digital network and associating it with related data, the metadata, in a structured extensible way. ...

External links

Coordinates: 21°7′29.67″N, 11°24′12.96″W Map of Earth showing lines of latitude (horizontally) and longitude (vertically), Eckert VI projection; large version (pdf, 1. ...


  Results from FactBites:
 
Earth's Richat Structure - SciForums.com (148 words)
The Richat Structure in the Sahara Desert of Mauritania is easily visible from space because it is nearly 50 kilometers across.
The possibility that the Richat Structure was formed by a volcanic eruption also seems improbable because of the lack of a dome of igneous or volcanic rock.
Rather, the layered sedimentary rock of the Richat structure is now thought by many to have been caused by uplifted rock sculpted by erosion.
  More results at FactBites »

 
 

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