Corundum- and zoisite-bearing marbles in the Rhodope Zone, Xanthi Area (N. Greece): Estimation of the fluid phase pomposition

摘要: In the area of Xanthi, N. Greece, regionally metamorphosed marbles which belong to Upper Tectonic Unit Rhodope Zone occur as intercalations within gneisses and amphibolites. one marble horizon abundant Al-rich minerals like corundum (ruby), spinel, pargasite, zoisite, anorthite were found. some cases, spinel occurs a rim around was formed reaction product + dolomite. Zoisite often coexists in equilibrium with calcite. These relationships permit calculation fluid phase composition is found be relatively poor CO2, thus indicating that water available-at least on local scale-during last, Barrow-type metamorphism. This probably supplied from metapelites by dehydration reactions during amphibolite facies overprint invaded rocks through fractures shear zones along contacts between different rock types.