Carlson (1999) pointed out that the coarsening of garnet porphyroblasts due to Ostwald ripening cannot have an appreciable effect as a control of the size of porphyroblasts. However, I found that the values of the appropriate parameters chosen by Carlson (1999) cause serious problem not only for Ostwald ripening, but also for the nucleation-and-growth model of Carlson (1989) and Carlson et al.(1995).

Here, I consider a model rock consisting of garnet (grt), chlorite (chl), quartz (qtz) and an aqueous fluid (H2O). The garnet-forming reaction (2/3) Fe4.5Al3Si2.5O10(OH)8 (chl) +...

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