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The Geological and Tectonic Framework of Europe

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The Geological and Tectonic Framework of Europe THE GEOLOGICAL AND TECTONIC FRAMEWORK OF EUROPE J.A. Plant1, A. Whittaker1, A. Demetriades2, B. De Vivo3, and J. Lexa4 1British Geological Survey, Keyworth, Nottingham, UK 2Institute of Geology and Mineral Exploration, Athens, Greece 3University of Napoli Federico II, Naples, Italy 4Geological Survey of Slovak Republic, Bratislava, Slovak Republic Introduction The geological record of Europe extends back structure has been greatly enhanced by the in time to about 3,500 million years, interpretation of new types of geophysical and approximately 1,000 million years after the Earth geochemical data. The present continent of was formed. Europe was the birthplace of Europe stretches from its submarine continental geological sciences. The first writers who have margin in the west to the Ural mountains in the contributed something of geological significance east, and from the ancient and relatively were the ancient Greek philosophers (Adams tectonically stable rocks of the Fennoscandian 1954), such as Thales of Miletus (c.636-546 BC), Shield in the north, to the young, more Anaximander of Miletus (615-547 BC), tectonically and volcanically active zone, of the Pythagoras of Samos (540-510 BC), Xenophanes central and eastern Mediterranean in the south. of Colophon (540-510 BC), Herodotus of The evolution of the continent took place as a Halicarnassus (480-420? BC), Aristotle of Stagira result of lithospheric plate interactions, which are (384-322 BC), Strabo (64 BC-23? AD) and many now relatively well understood. The outer region others. Modern geology begins with Georgius of the Earth, or lithosphere, includes the crust and Agricola in Germany (1494-1555 AD), who was the upper mantle, and is a rheologically more rigid one of the most outstanding figures in the history layer lying above a more plastic layer of the upper of the geological sciences, not only of his own mantle, known as the asthenosphere. The times, but of all time, and his rightfully called the lithosphere is divided into several major tectonic “Forefather of Geology”. Other eminent plates that move relative to one another, and pioneering figures are Leonardo da Vinci (1452- interact and deform, especially around their 1519 AD), Abbé Anton Lazzaro Moro (1687- margins. Orogenesis, involving crustal thickening, 1740 AD) and Antonio Vallisnieri (1661-1730 deformation and metamorphism, is often followed AD) in Italy, Conrad Gesner (1516-1565 AD) in by extensional collapse with widespread intrusion Switzerland, Nicolaus Steno (1638-1686 AD) in of highly evolved peraluminous granites. Plume Denmark, Abraham Gottlob Werner (1750-1817 activity is generally associated with continental AD) in Germany, Jöns Jacob Berzelius (1779- break up, and there is considerable evidence of 1848 AD) in Sweden, William Smith (1769-1839 this following the splitting of the Earth’s most AD), the father of English Geology, Charles Lyell recent supercontinent – Pangaea, beginning during (1797-1875 AD) and James Hutton (1726-1797 the Permo-Triassic times. At present, Europe AD) in the United Kingdom, Georges Cuvier forms the western part of the Eurasian Plate. In (1769-1832 AD) and Alexandre Brongniart the Mediterranean region it abuts against the (1770-1847 AD) in France, and Andreas African Plate to the south which, combined with Kordellas (1836-1909 AD) in Greece, working the broadly SE-directed ridge-push forces of the from the 15th to the late 19th centuries, to provide mid-Atlantic Ridge, and the beginning of an information on mineralogy, crystallography, eastward Atlantic plate compression along Iberia, palaeontology, stratigraphy and mineral resources. give a broadly NW-SE maximum horizontal Hence, the continent’s stratigraphy and structure crustal compressive stress throughout much of has been studied for almost 500 years. western and central Europe. Initially, geology involved the examination and Although the plate tectonic processes affecting survey of surface rock exposures to prepare Europe over the last 200 Ma period are reasonably geological maps. More recently, understanding of well understood, the earlier evolution of Europe’s the evolution of Europe’s continental crustal continental lithosphere has been extremely long and complex and geological, and tectonic events The discussion of Europe’s geological are more obscure and difficult to interpret further evolution that follows should be read in back in time. To fully understand Europe’s conjunction with Sheet 9 (Europe) of the geology requires consideration of plate tectonic Commission for the Geological Map of the World processes and the changing geometry and (CGMW) (Choubert and Faure-Muret 1976), and geography of plates operating throughout the the recently published 1:5 million CGMW 3,500 Ma (3.5 Ga) of the evolution of the International Geological Map of Europe and continent. Adjacent Areas (Asch 2003). Overview of the Geological and Tectonic Structure of Europe Like all continental landmasses, Europe basement of the English Midlands, the southern presently comprises various crustal blocks, which North Sea, and Armorica extending from western have been assembled over geological time (Figure Iberia and Brittany eastwards through central 1). In the extreme northwest of Scotland, there is Europe to the Bohemian Massif. The plate a fragment of the late Proterozoic continent of tectonic collision of Eastern Avalonia with the Laurentia, initially part of a North American- East European Craton followed closure of the Greenland landmass. Otherwise, Europe’s Lower Palaeozoic Tornquist Sea in late continental basement can be divided broadly into Ordovician to Silurian times. Whereas, the two large and distinct regions: collision of the Armorican micro-continent, with in the north and east a stable Precambrian both the East European Craton and Avalonia, craton known as the East European Craton followed the later closure of the Rheic and Theic (EEC), and Oceans (Galiza-Central Massif Ocean, e.g., Matte in the south and west a mobile belt, comprising 1991, Rey et al. 1997) probably towards the end crustal blocks that have become successively of middle Devonian. The southerly European attached to the ancient cratonic nucleus. Alpine orogenic belt is mostly of Caenozoic age. The boundary between these two regions is In Europe, the precise locations of separate marked by the NW-SE-trending Trans-European terranes, fault-bounded blocks of continental Suture Zone (TESZ) (previously known as the crust, usually smaller than microcontinents, Trans-European Fault, the Tornquist Line or the related to Avalonia or Armorica are poorly Tornquist-Teisseyre Line), which extends for exposed and concealed beneath younger rocks. approximately 2000 km from the North Sea to the Also, in places, the reworking of older rocks in Dobrogea region of the Black Sea. The TESZ is later orogenies has resulted in collages of everywhere obscured and concealed beneath relatively small shear-zone-bounded terranes Mesozoic and Caenozoic sediments, but it has (such as the Precambrian Mona complex of North been reasonably well-defined as a broad zone of Wales, and similar complexes in the Bohemian NW-SE-striking faults by subsurface geology, Massif). drilling results and geophysical methods, Hence, the crystalline basement of western and including deep seismic reflection data. central Europe comprises a complex mosaic of The East European Craton (EEC) comprises crustal elements, assembled during various Precambrian rocks of the Baltic, Ukraine and Precambrian orogenic cycles followed by the Voronezh shields, together with the Russian or Phanerozoic Caledonian, Hercynian and Alpine East European Platform, where the EEC is orogenies. During this long and complex crustal covered by relatively thin, undisturbed, evolution, earlier consolidated crustal elements Phanerozoic rock sequences. In contrast, the were repeatedly remobilised and overprinted by mobile belts to the south and west comprise later events. Thus, the basement provinces of Proterozoic-Palaeozoic crustal blocks (or western and central Europe are defined by the ‘microcontinents’), which originated as part of the latest orogenic event affecting that portion of southern Gondwana continent, tectonised by end- crust, causing widespread metamorphic reworking Precambrian Cadomian orogenesis that became and, in many cases, the intrusion of calc-alkaline attached to the south west margin of the EEC in igneous rocks. Palaeozoic times. These crustal blocks, belonging The oldest Precambrian basement provinces of to Eastern Avalonia, now form part of the western and central Europe, therefore, comprise the East European and Hebridean cratons, the poorly defined, partly as a result of a lack of data, stable Cadomian blocks of the London Platform and partly because they are concealed by younger and the East Silesian Massif, and the Caledonian, rocks. Also, metamorphic overprinting of some Variscan and Alpine fold belts. The boundaries older basement areas has occurred during later between the principal structural elements of the orogenic cycles. This is particularly the case with European continental elements are in places the Variscan fold belt, which in places seems to Figure 1. The ‘terrane collage’ of Precambrian and Phanerozoic Europe, a simplified sketch. Sutures and orogenic fronts are shown as bold lines, internal borders as thin or thin broken lines. Note that the size and shape of the terranes do not change significantly with time (approximate direction of younging is from north to south) (Reproduced with permission
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