Exfoliation : Physical or Chemical -- GEOFORUM

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Date Posted: 03:03:43 09/09/99 Thu
Author: Charles
Subject: Exfoliation : Physical or Chemical
In reply to: Dr. Chatterjea 's message, "(XSS229/3A)/Weathering" on 05:51:35 07/16/99 Fri

I have already been teaching this to my students that no weathering process is exclusive of water; especially when it comes to exfoliation. I know the textbooks(not sure of the newer versions-but Understanding Geog still outdated) depict this process as heating and expansion and purely by physical agents...I keep telling my students that they just "need to know" thay there is a new theory/belief that studies have been done to show that exfoliation(and other desert weathering processes for that matter) is more a chemical Weathering process than a physical weathering process. But they get confused since the textbooks still reflect the "old" understanding.
I wonder how other teachers get around this?
Maybe we should just publish something in Geonews and tell them to change their concept/teaching totally and not latch on to the "old" way. Just like we can now safely throw out the "Davisian" cycle of erosion.

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