RT Journal Article SR Electronic T1 A petrogenetic grid for the Fe-Mg silicates of pelitic schists JF American Journal of Science JO Am J Sci FD American Journal of Science SP 512 OP 536 DO 10.2475/ajs.263.6.512 VO 263 IS 6 A1 A. L. Albee YR 1965 UL http://www.ajsonline.org/content/263/6/512.abstract AB The topology of the reaction surfaces for the phases--garnet, chloritoid, staurolite, kyanite, cordierite, chlorite, and biotite--is shown for two limiting sections of Ps, T, P water space. . . . The basic assumption made is that the course of progressive metamorphism is primarily one of progressive dehydration with a progressive restriction of the fields of the most hydrous minerals, notably chlorite. The resulting petrogenetic grids. . . are predominantly theoretical and should serve as a useful check in assigning natural metamorphic sequences to their relative pressure-temperature relationships.