Petrology and geochemistry of Upper Carboniferous siliciclastic rocks (Téseny Sandstone Formation) from the Slavonian-Drava Unit (Tisza Megaunit, S Hungary) - summarized results

Abstract

Upper Carboniferous (Westphalian) coal-bearing fluvial sediments (Teseny 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 (Szaszvar 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,...