Acta Geologica 43. (2000)
1. szám - S. Karamata - V. Knežvic - V. Cvetkovic: Petrology of the Triassic basaltoid rocks of Vareš (Central Bosnia)
Consanguineous Triassic rift-related rocks are widespread further to east and southeast in western Serbia, Montenegro, Albania, Greece (e.g. Pe-Piper 1998) and Turkey. The BVCKZ is composed of different facial members (Karamata, this volume) now exposed close to each other as tectonic slices parallel to the elongation of the zone. Almost in the whole the Triassic is represented by the Lower Triassic sandstones, siltstones, followed by shales and Anisian marls and limestones. This complex is overlained by limestones, basaltoid to rare acid volcanics and cherts of the Ladinian age. The aim of this study is to present petrographical and geochemical characteristics of the basaltoid rocks of Vares. They bear very important constrains for understanding paleotectonic conditions during the formation of the whole BVCKZ. Lithology and petrography The effusive complex of Vares is situated on the northernmost part of the BVCKZ; it is WNW-ESE elongated, NNE steeply dipping lens-shaped body, about 5 km long and up to 500 m wide (Fig. 1). Along the tectonic northern and southern margins, where igneous products make sharp contact with Lower Triassic sediments reverse movements occurred. These ruptures intersect each other at the easternmost part of the Vares body. However, in the western area 2 S. Karamata et al. Simplified geological sketch of the Vareä effusive complex (after Karamata 1956). 1. Werfenian sediments; 2. Anisian limestones; 3. Ladinian sediments; 4. basaltoid rocks of Va re 5; I. the Upper unit; II. the Lower unit; numbers - samples analyzed on whole rock; encircled numbers - samples analyzed by microprobe Acta Geologies Hungarica 43, 2000