Роль Маданского надвига при формировании метасоматических залежей Могилы и Осиково в Центральных Родопах

H. Dragiev. Role of Madan overthrust in generation of the metasomatic deposits Mogila and Osikovo in Central Rhodopes. The metasomatic Pb-Zn deposits in Central Rhodopes are related to several stratigraphic levels corresponding to carbonate formations. The most typical ones are located within the Madan ore field. Based on computer data processing of Mogila and Osikovo deposits are factors selected as controlling ore-bearing. Scarns are most informative prospecting and explorating criteria for ore bodies of this type. Pb-Zn mineralization, predominantly poor, is associated with post-mineral metasomatic quartz also. Computerized geometric evaluations show clear East-West orientation of ore bodies. This changes existing ideas of the indirect connection of W-NW faults and mineralization. Special attention is paid to the position and regional behaviour of the Madan overthrust. Its clarified new position introduces significant changes into lithostratigraphy of the ore field. The overthrust controls the thickness of rocks which, from lithostratigraphic view point, favor the generation of metasomatic deposits, prerequisites the range of mineralization and the anisotropy of the rock massif. The environmental model of metasomatic ore bodies generation is built up on the ground of the analysis made in this paper.