origin of condensed Upper Cretaceous chalks, eastern Isle of Wight, UK (original) (raw)

none 10.1144/jgs2012-044 Geological Society of London Geological Society of London 1881 61120600 44798 2024072322141300087 10.1144 2024-07-24T11:53:26Z 2013-03-13T12:59:33Z 19 Journal of the Geological Society JGS 0016-7649 2041-479X 03 13 2013 03 2013 170 2 Channelling versus inversion: origin of condensed Upper Cretaceous chalks, eastern Isle of Wight, UK A. S. Gale School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth PO1 3QL, UK F. Surlyk Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350, Copenhagen K, Denmark K. Anderskouv Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350, Copenhagen K, Denmark Evidence from regional stratigraphical patterns in Santonian−Campanian chalk is used to infer the presence of a very broad channel system (5 km across) with a depth of at least 50 m, running NNW−SSE across the eastern Isle of Wight; only the western part of the channel wall and fill is exposed. Within this channel were smaller erosional structures (<10 m deep) that truncate originally horizontal bedding, are floored by hardgrounds, and locally have a basal fill of granular phosphorite. The entire channel system was progressively infilled by chalk, as demonstrated by the expanded succession of the lower Campanian Culver Chalk Formation. The beds of the channel fill are cut by small step faults, resulting from gravitational collapse. Complete burial had taken place by the base of the upper Campanian Portsdown Chalk Formation, which is of even thickness across the region. The structures are interpreted with reference to high-resolution seismic profiles through chalk channel systems described from the German sector of the North Sea, and the Santonian−Campanian of the eastern Paris Basin, and were formed by persistent bottom currents. 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