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  • Author or Editor: György Zoltán Józsa x
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Upper Carboniferous (Westphalian) coal-bearing fluvial sediments (Téseny Sandstone Formation) of the Slavonian-Drava Unit and their reworked pebbles and cobbles occurring in the western part of the Mecsek Mountains in Miocene conglomerate sequences (Szászvár Formation) were studied.  Based on the petrographic and geochemical characteristics, the sandstone studied consists of arkose, subarkose, litharenite and sublitharenite. The main clastic source was a recycled orogenic area (collision suture and fold-thrust belt) dominated by metamorphic rocks. It was associated with a probably Variscan magmatic arc as indicated by the volcanic rock fragments. The original source area of these clastic sediments was felsic and the analyzed sandstone could correspond to a continental arc/active margin tectonic suite.  The pebble and cobble-sized clasts of the conglomerate were predominantly derived from acidic and intermediate volcanic rocks, low-grade regional metamorphic rocks (different types of schist, metasandstone, mylonite, metagranitoid, gneiss, quartzite, and metaquartzite) and siliceous sedimentary rocks. Among the sedimentary clasts, reworked black siltstone and fine-grained sandstone from older (possibly Carboniferous) deposits are common. Chert and contact metamorphic rocks are present in minor quantity. The extracted volcanic clasts consist of andesite, trachyandesite, dacite and rhyolite. Their geochemistry suggests convergent, active continental margin affinity. Upper Carboniferous siliciclastic successions are widely known at the southeastern margin of the European Variscides. In the area of the Upper Silesian Coal Basin, the Cracow Sandstone Series (Westphalian C and D) shows a similar petrographic composition to that of the Téseny Sandstone Formation. Additionally, volcanic clasts of the Upper Carboniferous conglomerate from southern Transdanubia and the calc-alkaline volcanites from the Intra-Sudetic Basin can be characterized by similar geochemical patterns.

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