Litho-stratigraphic effect on Variscan fluid flow within the Prague synform,Barrandian: Evidence based on C,O, Sr isotopes and fluid inclusions |
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| Institution: | 1. Institute of Geological Sciences, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic;2. Geological Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, Slovak Republic;3. Department of Applied Geosciences and Geophysics, Mineralogy and Petrology, University of Leoben, Peter Tunner Strasse 5, A-8700 Leoben, Austria;1. Division of Speech Pathology and Audiology, Audiology and Speech Pathology Research Institute, Hallym University, Korea;2. Graduate Program in Speech Language Pathology, Hallym University, Korea;1. Departamento de Agronomia, Universidade Federal Rural de Pernambuco (UFRPE), Recife, Pernambuco 52171–900, Brazil;2. Unidade Acadêmica de Garanhuns, Universidade Federal Rural de Pernambuco (UFRPE), Garanhuns, Pernambuco 55292-270, Brazil;3. Empresa Brasileira de Pesquisa Agropecuária (Embrapa Agrossilvipastoril), Sinop, Mato Grosso 78550-970, Brazil;4. Departamento de Ciência do Solo da ESALQ, Universidade de São Paulo (USP), Piracicaba, São Paulo 13418–900, Brazil;5. Empresa Brasileira de Pesquisa Agropecuária (Embrapa Solos), Unidade de Execução de Pesquisa (UEP), Recife, Pernambuco 51020-240, Brazil;1. Geology and Applied Geology, University of Mons, Rue de Houdain, 9, 7000 Mons, Belgium;2. Hydrogeology and Environmental Geology – Aquapôle, Department ArGEnCo, Applied Sciences, University of Liège, Building B52/3, 4000 Liège, Belgium;3. Department of Geology and Geological Engineering, Université Laval, G1V 0A6 Quebec, Quebec, Canada;4. SPAQuE sa, Boulevard d’Avroy, 38/1, 4000 Liège, Belgium;1. Departamento de Geologia, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil;2. Center for Gravity, Electrical & Magnetic Studies, Department of Geophysics, Colorado School of Mines, Golden, CO, USA;3. Irish Centre for Research on Applied Geology (iCRAG), University College Dublin, Dublin, Ireland |
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| Abstract: | The Palaeozoic sedimentary sequence of the Prague synform (Ordovician–Devonian) in the centre of the Bohemian massif underwent Variscan deformation and thermal overprint events. Variscan veins widespread throughout the sedimentary strata have precipitated from syntectonic aqueous and hydrocarbon-rich fluids. Homogenization temperatures of aqueous inclusions increased from 70 up to 226 °C in the Cambrian rocks underlying the Prague synform. Seawater, modified due to intensive water–rock interaction, was the main fluid component. Fluid flow was limited and restricted to the lithostratigraphic compartments forming a rock-buffered system. Stable isotopic modelling (C, O) and final interpretations of the confined hydrostratigraphic fluid migration was supported by the 87Sr/86Sr ratio in veins and wall rocks. Siliciclastic Cambrian and Ordovician rocks and the associated intersecting veins yielded similar isotopic signatures, and consequently the fluid migration is restricted to layer- and formation-scales. Gradually downwards increasing fluid temperature and compositional changes reflect burial at oil-window conditions. An open fluid system could be expected in proximity of major faults of the Prague syncline and at the top of the sedimentary sequence. |
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