Beauty of the mountains: folded mountains

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Beauty of the mountains:

folded mountains

  When land layers of the Earth’s crust are subjected to tectonic stresses, these rocks will eventually deform. The deformations are initially soft, not brittle. We then obtain undulations of ground called folds. We are talking about folding rocks.
If the constraints continue, the deformations will become brittle: the rock breaks. We then obtain faults.
We can find folds of all sizes, from microplits less than one centimeter up to folds of regional dimension.                                                                                [.geowiki.fr]

800px-062_Commana_Anticlinal_près_de_Croas_Melar

Commana: Anticlinal around (east) Croas Melar, Brittany – France

Author: Moreau.henri  . Source: commons.wikimedia.org

5231975258_175a8ba0b7_b

Hedley Folds, Nelson batholith – Southern British Columbia

Author: Dru! . Source: flickr.com

400px-Ovens_anticline

Anticline and quartz « saddle reef » vein in the Halifax Formation (Cambrian), The Ovens, Nova Scotia – Canada

Author: Michael C. Rygel . Source: commons.wikimedia.org (treated)

800px-Sevehah_Cliff

Folded rocks of Sevehah Cliff, looking north from the trail up Convict Canyon. John Muir Wilderness, Sierra Nevada, California USA

Author: Jane S. Richardson . Source: commons.wikimedia.org

Barrios_Quartzite

Quartzite folded after shortening during the Carboniferous period (320 million years ago). La Barca Syncline, Asturias, Spain

Author: Dpastorgalan . Source: commons.wikimedia.org

800px-Agiospavlos_DM_2004_IMG002_Felsenformation

Due to the tectonics of the alpine folds, these sediments formerly deposited in a deeper basin (Pindosozean) have been deformed. They are one of the most photographed geological objects of all Crete – Greece

Author: Dieter Mueller . Source: commons.wikimedia.org

562px-SynclineCalico

Syncline exposed in the lower parking lot of Calico Ghost Town near Barstow, California

Author: Wilson44691 . Source: commons.wikimedia.org

800px-Folding_Gasteretal

Detachment folding in Lower Jurassic limestone layers of the Doldenhorn nappe, Gasteretal, Switzerland

Location is at the Waldhus, looking north. Scale of the outcrop is about 1 km from left (west) to right (east). Mountain ridge is from Jegertosse (2154 m, left) to the Innerer Fisistock (2787 m)

Author: Woudloper . Source: commons.wikimedia.org (treated)

Bekhal_in_Holydays_by_Husam.Jasim

Bekhal is located in the mountainous region of Kurdistan – Iraq

Author: Husam.Jasim. Source: commons.wikimedia.org

Folded_rocks_near_Collieston_-_geograph.org.uk_-_6084

Folded rocks near Collieston ( on the North Sea coast in Aberdeenshire, Scotland).

This is a splendid example of a tight recumbent fold, showing the forces which deformed these rocks during the Caledonian mountain building 400 million years ago.

Author: Anne Burgess. Source: commons.wikimedia.org

Le_Réglès_B

Mount Reglès (Alpes de Haute-Provence, France), synclinal fold

Author: Spiridon Ion Cepleanu. Source: commons.wikimedia.org

4016872_83a172aa

Complex Folds, 3 km from Glenfinnan, Highland, Great Britain

The rocks here are mica schists, pelites and psammites typical of the Glenfinnan Division of the Moine succession. They have been extensively deformed by tectonic movements, as can be seen by the many folds and the fact that here, in what is termed the Steep Belt, they have been tilted so that what was once horizontal is now close to vertical. They have been shaped into smooth mounds by the erosive power of a glacier moving over them during the last Ice Age.

Creative Commons Licence [Some Rights Reserved]   © Copyright Anne Burgess and licensed for reuse under this Creative Commons Licence. Source: geograph.org.uk






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