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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers
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To: Gib Bogle who wrote (55258)1/13/2008 5:23:43 AM
From: E. Charters   of 78418
 
Areas like that were the origin of the glaciers, and they were glaciated, so it may well be.

It is important to remember about geomorphology that glaciers cause scouring of the valleys, but they did not create them. The uplift you see is caused by colliding Archons, which thrust sheets up and buckled them as continents moved westward. The glacier was responsible for a small part of the rubble moving of the collapsing mountains, but was not the main engine of erosion. The main cause of erosion was freeze thaw cracking of steep mountains and water run off. Another related engine of rock dissolution was carbonic acid and other acids developing beneath ice. (acid rain was another variety of this.) A third cause of erosion is wind and dissolving volcanic gases. In tropical areas mountains erode to root hills just as effectively as they do in artic areas. The acids there may dissolve granite and silica, leaving sulfides uneroded. This makes prospecting very easy in the tropics as the hills often have the ore sulfides at their summit.

Many of the valleys in North America are glaciated. Very few were not but they are very isolated.

This is Axel Heiberg Island in the summer. It is viewed from a glacier.



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