Uplift and late orogenic deformation of the Central European Variscan belt as revealed by sediment provenance and structural record in the Carboniferous foreland basin of western Poland |
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Authors: | S. Mazur P. Aleksandrowski K. Turniak L. Krzemiński K. Mastalerz A. Górecka-Nowak L. Kurowski P. Krzywiec A. Żelaźniewicz M. C. Fanning |
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Affiliation: | (1) Institute of Geological Sciences, University of Wrocław, Borna 9, 50-204 Wrocław, Poland;(2) Polish Geological Institute, Rakowiecka 4, 00-975 Warsaw, Poland;(3) 2005 Bow Drive, Port Coquitlam, BC, V3E 1X4, Canada;(4) Institute of Geological Sciences PAN, Podwale 75, 50-449 Wrocław, Poland;(5) Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT, 0200, Australia;(6) Present address: GETECH, Kitson House, Elmete Hall, Elmete Lane, Leeds, LS8 2LJ, UK |
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Abstract: | The Carboniferous foreland basin of western Poland contains a coherent succession of late Viséan through Westphalian turbidites derived from a uniform group of sources located within a continental magmatic arc. Detrital zircon geochronology indicates that two main crustal components were present in the source area of Namurian A sediments. They represent Late Devonian and Early Carboniferous ages, respectively. The detritus from Westphalian D beds is much more diversified and contains admixture of Late Carboniferous zircons suggesting rapid unroofing of Variscan igneous intrusions in the hinterland between Namurian A and Westphalian D times. Tectonic repetitions of tens of metres thick fault-bounded stratigraphic intervals, recorded in several wells, provide evidence for compressional regime that occurred in the SW part of the Carboniferous basin not earlier than during the Westphalian C and produced NW–SE trending folds, concordant with the structural grain of the adjacent, NE part of the Bohemian Massif. |
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