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23 RUE LINOIS, 75724 PARIS CEDEX 15, FRANCE
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Geodinamica Acta, 1999, Vol 12, Issue 0, p. 201-211
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Brittle tectonics and major dextral strike-slip zone in the Buda karst (Budapest, Hungary)
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Benkovics L, Obert D, Bergerat F, Mansy Jl, Dubois M,
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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 degrees 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 strike-slip zone: the Ferenc-hegy zone. (C) Elsevier, Paris
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Keywords: age, barite, brittle tectonics, c, calcite, cave, caves, crystallization, events, extension, fault, fluid, fluid inclusion, fluid inclusions, fluid-inclusion, france, gypsum, hungary, investigation, karst, mineralization, miocene, oligocene, palaeostress fields, pannonian basin, phase, plane, quaternary, reconstruction, silica, source, strike-slips faults, tectonics, temperature, time, times, vein, zone,
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