Abstract
Mesozoic slightly metamorphosed sedimentary and volcano- sedimentary rocks have been proven in the south-eastern part of the Eastern Rhodopes around the villages of Bregovec, Orešino, Mandrica and Dolno Lukovo. They are subdivided into two groups: Mandrica Group (new group) - with supposed Triassic or Triassic - Early Jurassic age, and Maglenica Group (new group) - with Early Jurassic and Late Cretaceous age. Mandrica Group is built up of sedimentary and sedimentary-volcanogenic rocks accompanied by basic and ultrabasic magmatic rocks, all subjected to greenschist facies to epidote-amphibolite facies regional metamorphism. Two formations are subdivided within this group: Orešinovo Formation (new formation) mainly metasedimentary, with intrusive basic igneous rocks, and Gorno-Lukovo Formation (new formation), predominantly volcanogenic. Maglenica Group is represented by two formations: Dolno-Lukovo Formation (new formation), and Meden-buk Formation (new formation). Dolno-Lukovo Formation is of sedimentaryvolcanogenic composition and Early Jurassic age. It contains olistostroms with Upper Permian and MiddleUpper Triassic silicites and organogenic limestones as well as boudinaged bodies of tholeiitic basalts - clastolavas. The degree of alteration is anchimetamorphic. Meden-buk Formation belongs to the Upper Senonian (Campanian). It is sedimenrary volcanogenic, non-metamorphic, with basaltoid andesites. It is intruded by diorite-granodioritic hypabyssal intrusions. The rocks of Mandrica Group and Dolno-Lukovo Formation from the Eastern Rhodopes on Bulgarian territory are correlated after their composition, metamorphism and age with the lithostratigraphic units Makri and Drimos-Melia, described on Greek territory in Western Thrace. The Mesozoic rocks in the Eastern Rhodopes build together with the high-grade Precambrian metamorphics an allochthonous sheet (East-Rhodope complex nappe) which has been thrust over paraautochthonous in tensely diaphthorized Precambrian ultrametamorphics. The presence of Precambrian, Paleozoic, Triassic, Jurassic and Upper Cretaceous rocks in complex allochthonous structures supports the idea about the existence of a complex collisional orogen.
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