Brittle tectonics and major dextral strike-slip zone in the Buda karst (Budapest,Hungary) |
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| Institution: | 1. Department of Sedimentology & Environmental Geology, Geoscience Center Georg-August-University, Göttingen, Germany;2. Energy and Semiconductor Research, Institute of Physics, Carl von Ossietzky University, Oldenburg, Germany;1. Animal Breeding and Genomics, Wageningen Livestock Research, P.O. Box 338, 6700 AH, Wageningen, the Netherlands;2. Centre for Genetic Resources The Netherlands, PO Box 16, 6700 AA Wageningen, the Netherlands;3. Stichting Zeldzame Huisdierrassen, Dreijenlaan 2, 6703 HA Wageningen, the Netherlands;1. Université Laval, Faculté des sciences et de génie, 1045 Avenue de la Médecine, Québec, QC G1V 0A6, Canada;2. National Research Council of Canada, 75 de Mortagne Blvd., Boucherville, Québec, Canada J4B 6Y4;3. INRS-Énergie, Matériaux et Télécommunications, 1650 Boul. Lionel Boulet, Varennes, Québec J3X 1S2, Canada |
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| Abstract: | Three large (kilometric-scale) caves were studied in the Buda hills and the main directions of cave corridors, fault planes and mineralized veins were measured. Different stages of mineralizations are recognised: calcite scaleno-hedrons, baryte, silica, gypsum. New investigations of fluid inclusions in the baryte suggest a crystallization temperature of 50 °C and a freshwater fluid source. Microtectonic analysis allows the reconstruction of the successive tectonic events: (1) a NE-SW extensional phase at the Late Eocene-Early Oligocene limit (phase I), (2) a strike-slip phase with NW-SE compression and NE-SW extension during the Late Oligocene-Early Miocene (phase II), (3) a NW-SE transtensional phase (phase III) and finally (4) a NE-SW extensional phase of Quaternary age (phase IV). The major phase is the strike-slip one, characterized by an important dextral strikeslip zone: the Ferenc-hegy zone. |
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