Brittle tectonics and major dextral strike-slip zone in the Buda karst (Budapest,Hungary) |
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| Authors: | L Benkovics D Obert F Bergerat J L Mansy M Dubois |
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| Institution: | 1. Département de géologie de l’ingénieur, université technique, Sztoczek u. 2, H-1521, Budapest Hongrie;2. benkovics@bigmac.eik.bme.hu;3. Laboratoire de tectonique, université Pierre-et-Marie-Curie, boite 129, 4, place Jussieu, 75252 Paris cedex 5, France;4. bergerat@lgs.jussieu.fr;5. Laboratoire de sédimentologie et géodynamique, université de Lille-1, batiment SN 5, 59655 Villeneuve-d’Ascq cedex, France;6. jean-louis.mansy@univ-lillel.fr;7. michel.dubois@univ-lillel.fr |
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| Abstract: | AbstractThree 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 transten- sional 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 strike- slip zone: the Ferenc-hegy zone. © Elsevier, Paris |
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| Keywords: | brittle tectonics strike-slips faults fluid inclusions palaeostress Helds caves karst Pannonian Basin |
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