Geology and Metallogeny of the Drina-ivanjica Metamorphic Complex in Eastern Bosnia – Western Serbia

This paper gives a critical review of all relevant, published works on the stratigraphy, tectonics, magmatism, metamorphism and metallogeny of the metamorphic complex of the Drina-Ivanjica Formation in eastern Bosnia-western Serbia. Special attention was paid to all unresolved or controversial issues in geology and metallogeny of this area. The basic controversial geological problem is the question whether the DrinaIvanjica Formation ends with the Drina Phyllitoid Formation of Upper Cambrian-Lower Carboniferous age, or underneath it discordantly lies an older iron-bearing volcanogenic-sedimentary formation of Lower Cambrian-Vendian age. Detailed analysis of all studied Caledonian and Cadomian metallogenies in Bosnia and Herzegovina, western Macedonia and Serbia, and their comparison with iron deposits of the Drina Formation, considerably clarified the problem. As for controversial metallogenetic problems, a number of ore horizons, their age, genetic type and commercial value were considered. This led to the conclusion that only three ore horizons exist. The first horizon containing magnetite is also the oldest one and represents the liquid-magmatic segregation type of ore. The second horizon consists of Fe-quartzites and corresponds to SEDEX type of ore. It is characterized by hematitic and magnetitic subhorizons. The first and second horizons are bounded to the same volcanogenic-sedimentary formation. The third horizon containing hematite represents also SEDEX type of ore but is bounded to the younger, Carboniferous volcanogenic-sedimentary formation. Ključne riječi: istočna Bosna, zapadna Srbija, Drina-Ivanjica formacija, neoproterozoik, paleozoik, ležišta željeza, starost i genetski tip