P-T EVOLUTION OF THE METAPELITES FROM THE WESTERN SLOPE OF THE PIRIN MOUNTAIN

The metamorphic rocks from the western slope of the Pirin Mountain are traditionally interpreted as a part of the metamorphic rocks from the Rhodope massif (Zagorchev et. al., 1971; Zidarov et. al., 1971; Zagorchev, Dinkova, 1991 etc.). They were consi- dered as high-grade rocks of Precambrian age and were subdivided into lithostratigraphic units identical with those from the Central Rhodopes (Zagorchev, Dinkova, 1991 etc.). The high-grade metamorphic rocks from the western side of the Strymon valley are traditionally assigned either to the Serbo- Macedonian Massif (Kockel, Walther, 1965; Bonchev, 1971 etc.), or to the Rhodope massif (Ograzdenian Supergroup; Zagorchev, Dinkova, 1991). The new data show that the Rhodope and Serbo-Macedonian provinces of southern Bulgaria and northeastern Greece comprise a structurally complicated domain of tectonically intercalated high- and low-grade metamorphic rocks and igneous bodies. The two parts of this domain (Rhodope and Serbo-Macedonian) are separated by a brittle low-angle southwest dipping thrust fault, called the "Strimonüberschiebung"