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Alpine-type en echelon fissures, Chli Bielenhorn

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Copyright © Amir Akhavan
 
 
 

Alpine-type en echelon fissures, Chli Bielenhorn

Copyright © Amir Akhavan  - This image is copyrighted. Unauthorized reproduction prohibited.

Zone with large Alpine-type en echelon fissures in the southern rock wall of the Chli Bielerhorn. In the child photo the zone, the fissures and other features have been marked.

The rock is made of weakly metamorphosed granite, the so called "Central Aare granite". In the rock to the left and right many vertical joints and boudinage have formed as a response to compressional and shearing tectonic forces. The central area is less jointed and has the typical blocky appearence of granite rock walls. Horizontal compression and vertical extension together with shearing have caused the formation of an oblique zone of en echelon fissures in its lower part (marked blue on the child photo). The individual Alpine-type fissures have been colored in a darker blue wherever they are actually cut and quartz is visible. They are up to 2 m high and up to 12 m wide, and mostly filled with massive quartz (the "Quarzband"). To the left of the zone is a large fissure that has been exploited by strahlers, with a small whole of about 1 m height.

To the lower left a boudinage zone and its corresponding much smaller extensional fissures have been colored turquoise.

By accident I have also captured two climbers on the photo (yellow arrows), which gives one a good idea of the size of the captured area:
The field of view is about 100 meters wide and 130 meters high.

For a better idea of where this is, check out the high resolution version of this photo: http://www.mindat.org/photo-482014.html

August 2012.


This photo has been shown 584 times
Photo added:16th Aug 2012
Dimensions:2462x3072px (7.56 megapixels)

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