The composional zoning of garnet in eclogites from North of Shahrekord, Sanandaj - Sirjan Zone, Iran

The metabasite rocks from north of Shahrekord, which is a part of structural zone of Sanandaj-Sirjan, are undergone medium temperature – high pressure metamorphism (eclogite facies). These rocks then were subjected to a retrograde metamorphism (amphibolite facies). A distinct compositional zoning is preserved in fresh garnets which are formed during eclogite facies. The compositional or growth zoning in these eclogite rocks shows clockwise P-T-t path. In the beginning of metamorphism, P and T increased up to reach to the peak of high pressure metamorphism, then P decreased while the T was increasing during uplift and decompression. These growth stages indicate that Pmax was not contemporaneous with Tmax during eclogite facies metamorphism of the metabasites from North of Shahrekord, in Sanandaj - Sirjan Zone.