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Complex examination of the Upper Paleozoic siliciclastic rocks from southern Transdanubia, SW Hungary—Mineralogical, petrographic, and geochemical study

By
Andrea Varga
Andrea Varga
Department of Petrology and Geochemistry, Eötvös University, Pázmány Péter sétány 1/C, H–1117 Budapest, Hungary
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György Szakmány
György Szakmány
Department of Petrology and Geochemistry, Eötvös University, Pázmány Péter sétány 1/C, H–1117 Budapest, Hungary
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Tibor Árgyelán
Tibor Árgyelán
Department of Petrology and Geochemistry, Eötvös University, Pázmány Péter sétány 1/C, H–1117 Budapest, Hungary
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Sándor Józsa
Sándor Józsa
Department of Petrology and Geochemistry, Eötvös University, Pázmány Péter sétány 1/C, H–1117 Budapest, Hungary
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Béla Raucsik
Béla Raucsik
Department of Earth and Environmental Sciences, University of Veszprém, P.O. Box 158, H–8201 Veszprém, Hungary
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Zoltán Máthé
Zoltán Máthé
Mecsek Ore Environment, P.O. Box 121, H–7614 Pécs, Hungary
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Published:
January 01, 2007

A vertical section of Upper Paleozoic sandstones from southern Transdanubia (Mecsek-Villány area, Tisza mega-unit, Hungary) has been analyzed for major and trace elements, including rare earth elements (REEs). In addition, the clay mineralogy of the sandstone samples and the petrography and geochemistry of gneiss and granitoid clasts extracted from the associated conglomerates have been determined.

Geochemistry of the sandstone samples analyzed in this study shows that these rocks were predominantly derived from a felsic continental source; nevertheless, compositions vary systematically up-section. The Pennsylvanian (Upper Carboniferous) Téseny Formation has higher SiO2 and lower Na2O, CaO, Sr, high field strength element (HFSE), and ΣREE contents relative to the Permian strata. Its high K2O and Rb contents together with the presence of abundant illite-sericite suggest a potassium metasomatism in this formation. Clay mineralogy and large ion lithophile element (LILE) contents of the Lower Permian Korpád Formation vary spatially and are interpreted as local variations in composition of the source region and postdepositional conditions. Zr and Hf abundances and REE patterns, however, show that this formation was derived from mature upper continental crust. The Upper Permian Cserdi Formation has higher TiO2, Th, U, Y, Cr, and heavy (H) REE contents, and higher Cr/Th and Cr/Zr ratios relative to the underlying formations. These trends can be explained by a sedimentary system dominated by highly weathered detritus derived from combined recycled-orogen, basement-uplift, and volcanic-arc provenance in the Téseny Formation, with an increased proportion of less weathered detritus derived from combined volcanic and basement-uplift provenances in the Permian formations. Characteristics of the Cserdi unit may reflect relatively proximal derivation from a felsic volcanic source.

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Contents

GSA Special Papers

Sedimentary Provenance and Petrogenesis: Perspectives from Petrography and Geochemistry

José Arribas
José Arribas
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Mark J. Johnsson
Mark J. Johnsson
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Salvatore Critelli
Salvatore Critelli
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Geological Society of America
Volume
420
ISBN print:
9780813724201
Publication date:
January 01, 2007

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