Geochemistry of the Görcsöny Ridge amphibolites (Tisza Unit, SW Hungary) and its geodynamic consequences
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Mar 5, 2014
Keywords:
Tisza plate, Variscan orogeny, amphibolite geochemistry
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Abstract
The Görcsöny Ridge is part of the complicated Variscan metamorphic basement of the SW Tisza plate. It was penetrated by several wells, one of which (Baksa-2) explored 1200 m borecore available for petrological examination. Amphibolite samples of this core are of two different sorts: one sort contains biotite, rutile, and garnet, while the other contains ilmenite and is free of garnet. The two rock types occur separately along the borehole, defining a lower and an upper unit (LU, UU). Based on their major and trace element compositions, LU samples are within-plate (WP) tholeiites which assimilated pelagic sediments, while those of the UU represent WP alkali basalts. Thermobarometric calculations suggest that the difference in chemical composition itself does not explain the above differences in mineralogy, so the two units must also differ in their metamorphic histories. Consequently, the crystalline basement of the Görcsöny Ridge possibly consists of amalgamated fragments of different origins and evolutions which became juxtaposed during the Variscan collisional orogeny.
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References
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FINTOR, K., TÓTH T.M. & SCHUBERT, F. (2011): Hydrothermal palaeofluid circulation in the fracture network of the Baksa Gneiss Complex of SW Pannonian Basin, Hungary. – Geofluids, 11/2, 144–165.
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HAAS, J., KOVÁCS, S., KRYSTYN, L. & LEIN, R. (1995): Significance of Late Permian-Triassic facies zones in terrane reconstructions in the Alpine-North Pannonian domain. – Tectonophysics 242, 19–40.
HENRY, D.J., GUIDOTTI, C.V. & THOMSON, J.A. (2005): The Ti-saturation surface for low-to-medium pressure metapelitic biotite: Implications for Geothermometry and Ti-substitution Mechanisms. – American Mineralogist, 90, 316–328.
HORVÁTH, P., KOVÁCS, G. & SZAKMÁNY, GY. (2003): Eclogite and garnetiferous amphibolite gravels from Miocene conglomerates: new results for the Variscan metamorphic evolution of the Tisza Unit (Pannonian Basin, Hungary) – Geol. Carpath. 54/6, 1–12.
HORVÁTH, P., BALEN, D., FINGER, F., TOMLJENOVIĆ, B. & KRENN, E. (2010): Contrasting P–T–t paths from the basement of the Tisia Unit (Slavonian Mts.,NE Croatia): Application of quantitative phase diagrams and monazite age dating. – Lithos 117, 269–282.
IRVINE, T.N. & BARAGAR, W.A.R. (1971): A guide to the chemical classification of the common volcanic rocks. – Canadian Journal of Earth Sciences 8, 523–548.
KIRÁLY, E. (1996): Adalékok a délkelet-dunántúli polimetamorf aljzat megismeréséhez. (Contributions to the recognition of the polymetamorphic basement of SE Transdanubia. in Hungarian) – Földtani Közlöny 126/1, 1–23.
KLÖTZLI, U., BUDA, GY. & SKIÖLD, T. (2004): Zircon typology, geochronology and whole rock Sr-Nd isotope systematics of the Mecsek Mountain granitoids in the Tisia Terrane (Hungary). – Mineralogy and Petrology, 81, 113–134.
KOTKOVÁ, J. (2007): High-pressure granulites of the Bohemian Massif: recent advances and open questions. – Journal of Geosciences, 52, 45–71.
KOVÁCH, Á., SVINGOR, É. & SZEDERKÉNYI, T. (1985): Rb-Sr dating of basement rocks from the southern foreland of the Mecsek Mountains, Southern Transdanubia, Hungary. – Acta Miner. Petr. Szeged XXVII, 51–56.
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MESCHEDE, M. (1986): A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with a Nb-Zr-Y diagram. – Chemical Geology 56, 207–218.
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