File:Meander-cutoff The-Rincon Meander-Core Colorado-River Utah-USA.jpg
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English: The “Rincon”, an entrenched and abandoned meander in the Glen Canyon, the riverbed of the Colorado River, Utah, USA. The meander is thought to have formed in several thousand years ago. The cut of the meander shortened the river by ca. 9,6 km (6 miles). The abandoned section, 3,4 x 2,7 km (2,1 x 1,6 miles) by size, eroded a 180 - 230 m (600 - 740 ft) high “butte”, a mountain form typical in the hot, arid climate of Utah. The canyons of the Colorado Plateau formed within the past 5 million years by vigorous downcutting of the Colorado River and its tributaries, exposing more than 3 km (10000 ft) of bedrock over ca. 300 million years. The bedrock units range in age from “Late Pennsylvanian” (300 million years) to “Late Cretaceous” (85 million years), recording a fascinating history of mostly shallow marine depositions. Contrary to the mountain building thrust of the Rocky Mountains the high, thick crustal block of Colorado Plateau formations were remarkably stable with relatively little rock deformation, such as faulting and folding. Prior to and during the forming of The Rincon Meander bedrocks in the area were subject to uplifting. This caused the Glen Canyon bottom to be drastically eroded deeper. Therefore The Rincon Meander fell slowly dry and was finally abandoned. Deutsch: The “Rincon”, ein vor einigen tausend Jahren abgeschnürter Mäander des Colorado River (Glen Canyon im Lake Powell), Utah, USA. Die Abschnürung hat den Fluss im Canyon um ca.9,6 km verkürzt. Der mit 3,4 x 2,1 km recht große Mäander formte in seiner Mitte einen Umlaufberg, dessen steile Hänge 180 - 230 m hochragend, oben eine für heißes, arides Klima typische, flache Kappe hat Der Colorado und seine ebenfalls Canyons bildenden Tributare haben sich in fünf Millionen Jahren drastisch tief in das Colorado-Plateau eingeschnitten und dabei 3 km Gesteinsschichten, die 300 Millionen Jahre repräsentieren, freigelegt. Im Gegensatz zu den benachbarten, stark aufgefalteten Rocky Mountains liegt mit dem Colorado Plateau ein geologischer Block vor, der eine bemerkenswert stabile Einheit mit nur wenigen Deformationen, wie Faltungen und Verwerfungen aufweist. Die Formationen um den The Rincon unterlagen einer Aufwölbung, die bewirkten, dass sich das Glen Canyon durch größeres Gefälle in diesem Bereich besonders kräftig eintiefte, so dass der The Rincon Mäander allmählich trocken fiel und schließlich abgeschnürt wurde. |
| Date | 22nd April, 2021 |
| Source | https://earthobservatory.nasa.gov/images/77981/lake-powell-and-the-rincon-utah |
| Author | Ustill |
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This file is in the public domain in the United States because it was created by the Image Science & Analysis Laboratory, of the NASA Johnson Space Center. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA media use guidelines or Conditions of Use of Astronaut Photographs).
Photo source: ISS031-E-6398.
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| current | 15:43, 22 April 2021 | | 3,308 × 2,196 (6.98 MB) | Ulrichstill (talk | contribs) | Uploaded own work with UploadWizard |
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