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At 09:10 AM 07/06/2005 -0600, I wrote: >If the rate of plagioclase growth = rate of plagioclase dissolution, and >Grt_porph_diameter/compositional_layering_width is high, then plagioclase >dissolution-regrowth may actually be required in order to make approaching >equilibrium a possibility (in uppermost greenschist-amphibolite facies at >least). That really doesn't make any sense. I should have wrote: If the rate of plagioclase growth = rate of plagioclase dissolution, then plagioclase dissolution-regrowth may actually make the approachment of equilibrium more likely, and may even be required if Grt_porph_diameter/compositional_layering_width is high (in uppermost greenschist-amphibolite facies at least). Doug Doug Tinkham Dept. of Geology and Geophysics University of Calgary 2500 University Drive NW Calgary, Alberta T2N-1N4 Canada Ph:403-220-8209 e-mail: [log in to unmask]