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An earthquake origin for synsedimentary deformation in a late Triassic (Rhaetian) lagoonal sequence, southwest Britain

Published online by Cambridge University Press:  01 May 2009

M. J. Mayall
M. J. Mayall
Affiliation:
BP Exploration Company Limited, Britannic House, Moor Lane, London, EC2Y9BU
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Abstract

Summary. The late Triassic (Rhaetian) Cotham Member in southwest Britain was deposited in a shallow, dominantly freshwater lagoon and contains a bed of synsedimentary deformation which can be traced for at least 25 km. The bed includes microfaults and plastically deformed slump-folds. In south Wales and north Somerset the top of the bed is slightly eroded and desiccation cracks up to I m deep are present. The deformation was probably caused by earthquake activity and associated uplift in the north Somerset-south Wales area. Earthquake activity is inferred to have been part of the early Cimmerian tectonic phase in northern Europe. The bed of synsedimentary deformation is a stratigraphic 'event' which can be used for correlation in this area.

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Articles
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Geological Magazine , Volume 120 , Issue 6 , December 1983 , pp. 613 - 622
Copyright
Copyright © Cambridge University Press 1983

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References

REFERENCES

Anderson, F. W. 1964. Rhaetic ostracoda. Bull. geol. Surv. Gt Br. 21, 133–75.Google Scholar
Arango, I. & Seed, B. H. 1974. Seismic stability and deformation of clay slopes. J. Geotechnical Eng. Div. Am. Soc. civ. Engrs. 100 (GT2), 139–56.Google Scholar
Barrett, P. J. 1966. The effect of the 1964 Alaska earthquake on some shallow water sediments in Prince William Sound, South-East Alaska. J. sedim. Petrol. 36 (4), 992–1006.Google Scholar
Bennett, R. H., William, R. B., Dunlap, W. A. & Keller, G. H. 1976. Initial results and progress of the Mississippi Delta sediment pore water pressure experiments. Marine Geotechnology 1, 327–35.CrossRefGoogle Scholar
Bonilla, M. G. 1973. Trench exposures across surface fault ruptpres associated with the San Fernando Earthquake. In San Fernando, California, Earthquake of February 9, 1971, vol. 3 (ed. Murphy, L. M.), pp. 173–82. U.S. Dept. of Commerce, Nat. Oceanic and Atmospher. Admin.Google Scholar
Bridges, P. H. & Leeder, M. R. 1976. Sedimentary model for intertidal mudflat channels with examples from the Solway Firth of Scotland. Sedimentology 23, 533–51.Google Scholar
Brunstrom, R. G. W. & Walmsley, P. J. 1969. Permian evaporites in the North Sea Basin. Bull. Am. Ass. Petrol. Geol. 53, 870–83.Google Scholar
Duffin, C. J. 1980. The Upper Triassic section at Chilcompton, Somerset, with notes on the Rhaetic of the Mendips in general. Mercian Geologist 7, 251–68.Google Scholar
Fuller, M. L. 1912. The New Madrid Earthquake. Bull. U.S. geol. Surv. 494.Google Scholar
Ginsburg, R. N. & Hardie, L. A. 1975. Tidal and storm deposits north-eastern Andros Island, Bahamas. In Tidal deposits: a casebook of recent and fossil examples (ed. Ginsburg, R. N.), pp. 201–8. New York: Springer-Verlag.Google Scholar
Hamilton, D. 1962. Some notes on the Rhaetic sediments of the Filton by-pass substitute near Bristol. Proc. Bristol Nat. Soc. 30, 279–85.Google Scholar
Hamilton, D. 1977. Aust Cliff. In Geological Excursions in the Bristol District (ed. Savage, R. J. G.), pp. 110–19. University of Bristol Press.Google Scholar
Hamilton, D. & Whittaker, A. 1977. Coastal exposures near Blue Anchor, Watchet and St Audrie's Bay, Somerset. In Geological Excursions in the Bristol District (ed. Savage, R. J. G.), pp. 101–10. University of Bristol Press.Google Scholar
Hansen, W. R. 1965. Effects of the earthquake of 27th March, 1964, at Anchorage Alaska. U.S. Geol. Surv. Prof. Paper 542-A.Google Scholar
Harris, T. M. 1938. The British Rhaetic Flora. London: British Museum (Natural History). 85 pp.Google Scholar
Ivimey-Cook, H. C. 1974. The Permian and Triassic deposits of Wales. In The Upper Palaeozoic and post-Palaeozoic Rocks of Wales (ed. Owen, T. R.), pp. 295–321. Cardiff: University of Wales Press.Google Scholar
Kellaway, G. A. & Welch, F. B. A. 1948. Bristol and Gloucester District, 2nd edition. British Regional Geology. London: HMSO.Google Scholar
Kent, P. E. 1975. The tectonic development of Great Britain and the surrounding seas. In Petroleum and the Continental Shelf of North-West Europe (ed. Woodland, A. W.), pp. 3–29. Barking: Applied Science Ltd.Google Scholar
Laury, R. L. 1971. Stream bank failure and rotational slumping: preservation and significance in the geologic record. Bull. geol. Soc. Am. 82, 1251–66.CrossRefGoogle Scholar
Lowe, D. R. 1975. Water escape structures in coarse grained sediments. Sedimentology 22, 157–204.CrossRefGoogle Scholar
Mayall, M. J. 1981. The Late Triassic Blue Anchor Formation and the initial Rhaetian marine transgression in south-west Britain. Geol. Mag. 118, 377–84.Google Scholar
Melville, R. V. 1963. Stratigraphical palaeontology of the Lias and Rhaetic beds of the Upton Borehole. Bull. geol. Surv. Gt Br. 20, 163–71.Google Scholar
Miller, J. A. 1975. Facies characteristics of Laguna Madre wind-tidal flats. In Tidal Deposits: a Casebook of Recent and Fossil Counterparts (ed. Ginsburg, R. N.), pp. 67–77. New York: Springer-Verlag.CrossRefGoogle Scholar
Plafker, G. 1965. Tectonic deformation associated with the 1964 Alaska earthquake. Science 148, 1676–87.Google Scholar
Poole, E. G. 1969. The stratigraphy of the geological survey Apley Barn borehole, Witney, Oxfordshire. Bull. geol. Surv. Gt Br. 29, 1–28.Google Scholar
Poole, E. G. 1977. The stratigraphy of the Steeple Aston borehole, Oxfordshire. Bull. Geol. Surv. Gt Br. 57.Google Scholar
Poole, E. G. 1978. Stratigraphy of the Withycombe Farm borehole, near Banbury, Oxfordshire. Bull. geol. Surv. Gt Br. 68.Google Scholar
Poole, E. G. & Whiteman, A. T. 1966. Geology of the country around Nantwich and Whitchurch. Mem. geol. Surv. Gt Br. 122.Google Scholar
Rascoe, B. 1975. Tectonic origin for pre-consolidation deformation in Upper Pennsylvanian rocks near Bartlesville, Oklahoma. Bull. Am. Assoc. Petrol. Geol. 59, 1626–38.Google Scholar
Reineck, H. E. & Wunderlich, F. 1968. Classification and origin of flaser and lenticular bedding. Sedimentology 11, 991–1004.CrossRefGoogle Scholar
Retteger, R. E. 1935. Experiments on soft rock deformation. Bull. Am. Ass. Petrol. Geol. 19, 271–92.Google Scholar
Richardson, L. 1905. The Rhaetic and contiguous deposits of Glamorganshire. Q. Jl. Geol. Soc. Lond. 61, 385–424.Google Scholar
Richardson, L. 1906. On the Rhaetic and contiguous deposits of Devon and Dorset. Proc. Geol. Ass. 19, 401–9.CrossRefGoogle Scholar
Richardson, L. 1911. The Rhaetic and contiguous deposits of West-mid and part of East Somerset. Q. Jl. Geol. Soc. Lond. 67, 1–74.Google Scholar
Rymer, J. M. & Sims, J. D. 1976. Preliminary Survey of Modern Glacio-lacustrine Sediments for Earthquake-induced Deformation Structures, S. Alaska. U.S. Geol. Survey open file report no. 76–373.CrossRefGoogle Scholar
Seed, H. B. 1968. Landslides during earthquakes due to soil liquifaction. J. Soil Mech. Fdns. Div. Am. Soc. Civ. Engrs. 94 (SM 5), 1055–122.Google Scholar
Seih, K. E. 1978. Prehistoric large earthquakes produced by slip on the San Andreas Fault at Pallet Creek, California. J. geophys. Res. 83, 3908–39.Google Scholar
Seilacher, A. 1969. Fault-graded beds interpreted as seismites. Sedimentology 13, 155–9.CrossRefGoogle Scholar
Seilacher, A. 1982. General remarks about events deposits. In Cyclic and Event Stratification (ed. G., Einsele and A., Seilacher), pp. 161–74. Berlin, Heidelberg: Springer-Verlag.Google Scholar
Shinn, E. A., Lloyd, R. M. & Ginsburg, R. N. 1969. Anatomy of a modern carbonate tidal flat, Andros Island, Bahamas. J. sedim. Petrol. 39, 1202–28.Google Scholar
Sims, J. D. 1973. Earthquake-induced structures in sediments of Van Norman Lakes, San Fernando, California. Science 182, 161–3.CrossRefGoogle Scholar
Sims, J. D. 1975. Determining earthquake recurrence intervals from deformational structures in young lacustrine sediments. Tectonophysics 29, 141–52.CrossRefGoogle Scholar
Sims, J. D. 1978(a). Annotated Bibliography of Penecontemporaneous Deformational Structures in Sediments, 1819-April 1978. U.S. Geol. Surv. open file report no. 78–510.Google Scholar
Sims, J. D. 1978(b). Environments of formation of earthquake induced deformational structures in sediments. International Ass. Sedimentologists (Israel) Absis., 613.Google Scholar
Warrington, G., Audley-Charles, M. G., Elliotte, R. E., Evans, W. B., Ivimey-Cook, H. C., Kent, P. E., Robinson, P. L., Shotton, F. W. & Taylor, F. M. 1980. Triassic - a correlation of Triassic rocks in the British Isles. Geol. Soc. Special Report no. 13, 78 pp.Google Scholar
Weaver, J. D. 1976. Seismically-induced load structures in the basal Coal Measures, South Wales. Geol. Mag. 113, 535–43.Google Scholar
Wells, J. T., Prior, D. P. & Coleman, J. M. 1980. Flowslides in muds on extremely low angle tidal flats, northeastern South America. Geology 8, 272–5.2.0.CO;2>CrossRefGoogle Scholar
Whittaker, A. 1978. The lithostratigraphic correlation of the uppermost Rhaetic and lowermost Liassic strata of the west Somerset and Glamorgan area. Geol. Mag. 115, 63–7.CrossRefGoogle Scholar
Wright, V. P. & Mayall, M. J. 1981. Organism-sediment interactions in stromatolites: an example from the Upper Triassic of south-west Britain. In Phanerozoic Stromatolites (ed. C., Monty), pp. 74–84. Berlin, Heidelberg: Springer-Verlag.Google Scholar
Yerkes, R. F. 1973. Effects of San Fernando earthquake as related to geology. In San Fernando, California, Earthquake February 9, 1971, vol. 3 (ed. Murphy, L. M.), pp. 137–55. U.S. Dept. of Commerce, Nat. Oceanic and Atmospher. Admin.Google Scholar
Ziegler, P. A. 1975. North Sea Basin history in the tectonic framework of north-western Europe. In Petroleum and the Continental Shelf of North-west Europe (ed. Woodland, A. W.), pp. 131–51. Barking: Applied Science Ltd.Google Scholar
Ziegler, P. A. 1978. NW Europe: tectonics and basin development. Geologie en Mijnbouw 57, 589–626.Google Scholar