Nigel, a volume change would be important, but is it known that volume change is responsible for the folding in the Castile Formation? I did a search and failed to find anything published on this idea for the Castile.
Best,
Mark
On Jan 20, 2014, at 3:28 PM, Nigel Woodcock <[log in to unmask]> wrote:
> All
> These rocks look suspiciously like dolomite (yellow) and maybe gypsum (grey)? The structures could then be 'enterolithic' folds due to the ~40% volume increase as original anhydrite recrystallises to gypsum? See
> http://www.newark.osu.edu/facultystaff/personal/jstjohn/Documents/Rocks-and-Fossils-in-the-Field/Gypsum-Plain.htm
> for pictures of the classic Castile Formation structures (Permian, west Texas & New Mexico).
> Nigel Woodcock
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