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Gold/Mining/Energy : Manhattan Minerals (MAN.T)
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To: Elizabeth Andrews who wrote (2965)7/9/1999 4:01:00 PM
From: Jeff Dickson  Read Replies (1) of 4504
 
And, my new dictionary says that exfoliation is also produced by chemical forces producing differential stress within the rock. It doesn't say that it is strictly a surface phenomenon. It does say it is noticeable on surface where eroded.

The exfoliation is caused by weathering, so the rock has to been exposed at the surface. It could I guess be covered up again by a volcanic flow or deposition by other means.

In fact, the notion that it is caused by the rock that was formed at depth subsequently being exposed at the surface and no longer experiencing compressive forces is now out of favor. So too are large temperature cycles during the day. Exfoliation occurs due to water penetrating the surface of the rock, resulting in clay which expands and flakes off the surface of the rock.

The exfoliation that takes place underground is small scale, and is also called spheroidal weathering.
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