Sarolta BODOR¹, György SZAKMÁNY², Sándor JÓZSA² & Zoltán MÁTHÉ^3
1University of Miskolc, Institute of Mineralogy and Geology, H-3515 Miskolc, Egyetemváros, Hungary, (bodors@gmail.com)
²Eötvös Loránd University, Department of Petrology and Geochemistry, H-1117 Budapest, Pázmány Péter sétány 1/c, Hungary, (gyorgy.szakmany@geology.elte.hu, sandor.jozsa@geology.elte.hu)
³Mecsek Ore Enviroment Company, H-7633 Pécs, Esztergár Lajos út 19, Hungary, (mathezoltan@mecsekerc.hu)

PETROLOGY AND GEOCHEMISTRY OF THE UPPER PERMIAN - MIDDLE TRIASSIC SILICICLASTIC FORMATIONS OF THE IBAFA-4 BOREHOLE (NW-MECSEK MTS., HUNGARY)

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In this paper, we present the results of the petrological and geochemical study of the Upper Permian-Middle Triassic Kővágószőlős Sandstone, Jakabhegy Sandstone and Patacs Siltstone Formations sampled by borehole Ibafa-4. Granitoids, metamorphites and acidic volcanites were the dominating rock types in the provenance of Bakonya and Kővágótöttös Sandstone Members of the Kővágószőlős Sandstone Formation, although in the provenance of Bakonya Member granitoids and metamorphites were typical. The provenance of Cserkút Sandstone Member of the Kővágószőlős Sandstone Formation was less variegated: the granitoids and metamorphites had been already eroded, therefore the acidic volcanic clasts became dominant. The provenance of Jakabhegy Sandstone Formation resembles to Cserkút Member, but the Jakabhegy Sandstone is more mature that reinforces the earlier supposition that it had redeposited. The provenance of Patacs Siltstone was very similar to that of Jakabhegy Sandstone Formation. The geochemical data well reflect the mineralogical and petrological qualities, the effect of grain size and the post-sedimentary effects. The results indicate significant, subsequent Na depletion and a slight K enrichment in Kővágótöttös and Cserkút Member (Kővágószőlős Sandstone) and in the Jakabhegy Sandstone as well. The Na depletion is characteristic especially for the same members in Ibafa-4 borehole thus for the Gorica environs. The partial fading exhibited by the Jakabhegy Sandstone is due to the diagenetic effect. Cu enrichment in Bakonya Member of Kővágőszőlős Sandstone Formation which is known in W-Mecsek was also recognised in the Ibafa-4 borehole.