Spectacular formation remains a puzzle

The Richat Structure, Oudane, Mauritania, is not really a structure but a huge circular formation (50 km in diameter - 30 miles), that resembles an eye when looked upon from space. Originally thought to be a crater, this volcanic dome is most likely a product of erosion, an ancient geological artifact in the middle of featureless Maur Adrar desert, in Africa's Western Sahara. The earliest space missions used it as a landmark, the adventurous 4x4 enthusiasts consider it to be their playground, and scientists are still debating its origin.



The Google Maps coordinates are 21.124217, -11.395569


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If you unzoom, you can distinctly see the eye:


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We even found some Photoshop of this eye, combining it into an Optimus Prime-like face:


(image credit: Lebovski)

The meteorite impact theory could not explain the flatness of the "crater"'s floor, so the most accepted explanation is the erosion of the initial volcanic dome, which gradually peeled away the layers of rock, creating the present onion-like form.

This image was taken by an Expedition 15 crew member on the International Space Station. (via Space.com)



The following picture must have simulated color, for it looks almost like a fantastic lake:


(image credit: United States Geological Survey - USGS)

"Paleozoic quartzites form the resistant beds outlining the structure." (GSA Journals) A couple of other simulated images to illustrate that:

The topographical 3-D relief image, found on Wikipedia, shows "Le Guelb ri Richat" in most detail (The view is exaggerated six times vertically, the colors are slightly enhanced):



Here is a portion of this visualization, looking like landscape on some other planet:


Credit: NASA/JPL/NIMA

Johnnie Shannon image-enhanced the satellite image, clearly showing an eroded circular anticline (structural dome) of layered sedimentary rocks:



and Christoph Hormann created a spectacular view, using various modeling software:


(see more on his site)

: Jika anda mempunyai sebarang cadangan atau pandangan mengenai Artikel / 'Poasting' di atas, Kami mengalu-alukan komen anda kepada kami. [ sebarang aduan, cadangan, pendapat, rencana atau sebagainya ]

try , Khamis, September 13, 2007 | 0 komentar ::

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