Hydrothermal Activity in the Sakar Unit of Southeastern Bulgaria Krzysztof Szopa 1, * , Anna Sałacińska 2 , Ashley...1421 Sofia, Bulgaria; petkopet@abv.bg Hristo Smirnenski 37-41, G, 51 Topolovgrad, Bulgaria; cho2@mail...2020 Abstract: Southeastern Bulgaria is composed of a variety of rocks from pre-Variscan...most common accessory minerals are rutile and molybdenite. Apatite and titanite from the same vein were...U–Pb dating; Cimmerian; apatite; titanite; Sakar; Bulgaria 1. Introduction The Balkan Peninsula consists