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| Rhenohercynian | |
|---|---|
| Name | Rhenohercynian |
| Type | Orogenic system / Fold belt |
| Period | Paleozoic |
| Region | Western Europe |
| Country | Belgium; France; Germany; Luxembourg; Netherlands; United Kingdom |
Rhenohercynian is a Paleozoic orogenic domain and fold belt interpreted across parts of Belgium, France, Germany, Luxembourg, Netherlands, and the United Kingdom, associated with Variscan orogeny phases and linked to the closure of Rheic Ocean segments. The concept appears in regional syntheses alongside units such as the Armorican Massif, Bohemian Massif, Massif Central, and Cantabrian Zone, and is used in comparative studies involving the Appalachian Mountains, Variscan Belt, Caledonian orogeny, and Ural Mountains. Work on the Rhenohercynian domain has been published by researchers affiliated with institutions like the Royal Society, Geological Society of London, Bayerisches Geoinstitut, and Centre National de la Recherche Scientifique.
The name derives from a compound of the Rhine region and the historical Hercynian Forest tradition used in 19th-century European geology by figures such as Abraham Gottlob Werner, Alexander von Humboldt, Adam Sedgwick, and Roderick Murchison. Early usage appears in monographs by scholars at the Imperial Geological Survey of Prussia, Geological Survey of Belgium, and universities like University of Bonn, University of Strasbourg, University of Göttingen, and University of Cambridge. The lexical history connects to debates involving Eduard Suess, Alfred Wegener, Julius von Haast, and later syntheses by Siegfried Passarge and Hans Stille.
The domain extends from the Anglo-Paris Basin margin near London Basin and the English Channel through the Belgian Ardennes, across the Rhenish Massif and into the Harz Mountains and parts of the Bohemian Massif border. It is juxtaposed against the Armorican Massif, South Portuguese Zone, and the Iberian Massif, and transects basins and basements mapped by the British Geological Survey, Bureau de Recherches Géologiques et Minières, and the Bundesanstalt für Geowissenschaften und Rohstoffe. The Rhenohercynian domain is spatially related to the Rhine Graben, Saar-Nahe Basin, Lower Rhine Embayment, and the Paris Basin structural systems.
Stratigraphic successions include Cambrian to Devonian siliciclastics, Ordovician turbidites, Silurian black shales, and Devonian redbeds comparable to sequences in the Cantabrian Zone, Armorican Massif, Massif Central, and the South Armorican Shear Zone. Lithologies feature slates, phyllites, sandstones, siltstones, conglomerates, and carbonate interbeds mirrored in sections logged by the Geologische Bundesanstalt, Geological Survey of Ireland, and field campaigns at locales like the Eifel, Westerwald, Hunsrück, and Mendip Hills. Chronostratigraphic frameworks reference stages established by the International Commission on Stratigraphy and correlate with biostratigraphic markers from faunal provinces studied by Charles Lapworth, Alfred Salter, and John Salter.
Tectonic models invoke closure of Rheic Ocean plates, continental collision between microcontinents like Avalonia, Armorica, and Gondwana-derived terranes, and successive compressional events during Variscan phases recorded by structures comparable to those in the Massif Central, Iberian Massif, Bohemian Massif, and Saxothuringian Zone. Kinematic reconstructions use data from seismic profiles by Schlumberger, paleomagnetic studies from teams at the University of Cologne and University of Leeds, and thermochronology carried out at the Scottish Universities Environmental Research Centre and University of Mainz. Key processes invoked include thrusting, fold propagation, nappes, and strike-slip displacement analogous to mechanisms in the Alps, Apennines, and Hercynian-related belts described by Paul Tapponnier and Jean-Pierre Brun.
Paleogeographic reconstructions place the domain along passive margin to active margin transitions during the Silurian–Devonian, with depositional systems comparable to those reconstructed for the Old Red Sandstone continent, Avalonia, and Laurentia margins. Paleoenvironmental indicators include marine anoxic events, carbonate platform hiatuses, and fluvial redbed deposits analogous to facies in the Devonian of Spain, Ireland, Wales, and the Rhenish Massif. Data derive from isotope geochemistry by laboratories at ETH Zurich, University of Utrecht, and paleoecological work by specialists influenced by the research traditions of Roderick Murchison and Murchison's contemporaries.
The domain hosts mineralization styles including lead–zinc–barite, iron ore, and hydrocarbon potential in associated basins such as the Paris Basin and North Sea margin, with mining records tied to sites like Eisenerz, Eifel, Saarland, and historic workings documented by the Mining Academy Freiberg and archives of the Royal Museum for Central Africa. Exploration by companies including BP, TotalEnergies, Shell, and regional operators has targeted structural traps, and metallogenic models reference analogues in the Cornubian Batholith and Siegen-Wissen deposits. Geochemical studies have been conducted at facilities such as GFZ Potsdam and BRGM.
Research traces from 19th-century mapping by the Geological Survey of Belgium and the Prussian Geological Survey through 20th-century syntheses by Emil Tietze, Hans Stille, and Pierre Sabatier to modern reinterpretations by consortia involving the European Geosciences Union, International Union of Geological Sciences, and university groups at Utrecht University, Ghent University, University of Cologne, and Universität Mainz. Debates over scope and definition have been informed by conferences held by the Geological Society of London and publications in journals such as Tectonophysics, Journal of the Geological Society, and Geologica Belgica. Contemporary nomenclature aligns with integrated mapping projects supported by the European Commission and national surveys like the BGS, BRGM, and BGR.