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The concealed Caledonide basement of Eastern England and the southern North Sea — A review
Authors:Tim Pharaoh  Richard England  Mick Lee
Affiliation:(1) Petroleum Geology and Basin Analysis Group, British Geological Survey, NG12 5GG Keyworth, Nottinghamshire, United Kingdom;(2) BIRPS, Bullard Laboratories, Madingley Road, CB3 0EZ Cambridge, United Kingdom;(3) Regional Geophysics Research Group, British Geological Survey, NG12 5GG Keyworth, Notts., United Kingdom
Abstract:Summary Field mapping, analysis of borehole core and studies of geophysical potential field and seismic data can be used to demonstrate the existence of a number of distinct crustal blocks within Eastern Avalonia beneath eastern England and the southern North Sea. At the core of these blocks is the Midlands Microcraton which is flanked by Ordovician volcanic arc complexes exposed in Wales and the Lake District. A possible volcanic arc complex of comparable age in eastern England is concealed by late Palaeozoic and Mesozoic cover. These volcanic arc complexes resulted from subduction of oceanic lithosphere beneath Avalonia prior to collision with Baltica and Laurentia in late Ordovician and Silurian time, respectively. The nature of the crust north and east of the concealed Caledonides of Eastern England and south of the lapetus Suture/Tornquist Sea Suture, which forms the basement to the southern North Sea, is unclear. Late Ordovician metamorphic ages from cores penetrating deformed metasedimentary rocks on the Mid-North Sea High suggest these rocks were involved in Avalonia-Baltica collision before final closure of the lapetus Ocean between Laurentia and Avalonia.
Keywords:tectonics  Tornquist Suture  Avalonia  terrane  Microcraton
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