The mineral composition of Rhenohercynian flysch sediments and its tectonic significance

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Authors:Engel, W.; Flehmig, W.; Franke, W.
Author Affiliations:Primary:
Geol.-Paläontol. Inst., Gottingen, Federal Republic of Germany
Other:
Sediment-Petrogr. Inst., Federal Republic of Germany
Volume Title:Intracontinental fold belts; case studies in the Variscan belt of Europe and the Damara Belt in Namibia
Volume Authors:Martin, Henno; Eder, Franz Wolfgang
Source:Intracontinental fold belts; case studies in the Variscan belt of Europe and the Damara Belt in Namibia, Henno Martin and Franz Wolfgang Eder, p.171-184. Publisher: Springer-Verlag, Berlin, Federal Republic of Germany. ISBN: 3-540-12440-3
Publication Date:1983
Note:In English. 45 refs.Sonderforschungsbereich (SFB) 48-Göttingen; illus. incl. geol. sketch map
Summary:The Rhenohercynian (the northern, external zone of the European Variscides) is characterized by a northern tectonic vergence and by a northward migration of the Devonian-Upper Carboniferous flysch trough. In the Upper Namurian, the flysch grades into coal-bearing molasse. IR spectroscopy was used to analyse the flysch and the basal molasse rocks, in an attempt to fit the data into a general tectonic concept. There are important changes in the mineral composition in both the vertical profile and a downcurrent section. It is therefore necessary to select samples which have approximately the same position in the turbidite body. As known from earlier studies, feldspar decreases from approx 30% (Devonian to Lower Carboniferous) to approx 10% (Upper Carboniferous). Most of the feldspar is present as albite, which probably originated from other feldspars by diagenetic and low-grade metamorphic alteration. The decrease in feldspar is compensated by an increase in illite and chlorite and, from the late Lower Carboniferous III onwards, by an increase in quartz. A similar development is detectable in the Harz Mts, S Portugal and Moravia. The mineral composition data and record of rock fragments both suggest an increasing proportion of sedimentary and metasedimentary rocks in the source area, which is unusual for a rising orogenic hinterland. This trend is best explained by the concept of an accretionary tectonic wedge. [P.Br.]
Subjects:Carboniferous; Clastic rocks; Devonian; Flysch; Graywacke; IGCP; Mineral composition; Orogeny; Paleozoic; Provenance; Sedimentary rocks; Stratigraphy; Structural geology; Tectonics; Variscan Orogeny; Central Europe; Europe; Germany; Harz Mountains; Rhenish Schiefergebirge; Variscides; Evolution; Rhenohercynian Zone; West Germany
Abstract Numbers:84M/3263
Record ID:1986082607
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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