Marine Geophysical Researches

, Volume 14, Issue 3, pp 227–248 | Cite as

Southern Segment of the European Geotraverse — a wide-angle seismic refraction experiment in the Sardinia Channel

  • C. Peirce
  • P. J. Barton


The Sardinia Channel dataset was collected as part of the European Geotraverse (EGT)—a 4000 km seismic refraction line running from Northern Norway to the Sahara, designed to investigate the structure of the lithosphere beneath Europe. Wideangle seismic data recorded by ocean bottom seismometers deployed in the Sardinia Channel as part of the Southern Segment of the EGT, together with gravity data, were used to constrain the final crustal model. In the centre of the Channel the crust is identified as thinned continental in nature, with a crystalline thickness of 10 km overlain by 4 km of sediments and 2.5 km of water in the most extended region. High velocities in the lower crust in the central region are thought to represent an area of underplating or intrusion by igneous material caused by extension related to the opening of the Tyrrhenian Sea. The crust overlies an anomalously low velocity upper mantle.

Key words

OBS thinned continental crust seismic structure Sardinia Channel rifted continental margin European Geotraverse 


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  1. Auzende, J.-M. and Olivet, J.-L., 1974, Structure of the Western Mediterranean Basin, in: Burk, C. A. and Drake, C. L. (eds.),The Geology of Continental Margins, Springer-Verlag, New York, p. 723–731.Google Scholar
  2. Avedik, F., Camus, A. L., Ginzburg, A., Montadert, L., Roberts, D. G., and Whitmarsh, R. B., 1982, A Seismic Refraction and Reflexion Study of the Continent-Ocean Transition Beneath the North Biscay Margin,Phil. Trans. R. Soc. Lond. A305, 5–25.Google Scholar
  3. Banda, E., Ansorge, J., Boloix, M. and Córdoba, D., 1980, Structure of the Crust and Upper Mantle beneath the Balearic Islands (Western Mediterranean),Earth Plan. Sci. Lett.,49 219–230.Google Scholar
  4. Barton, P. J., 1983, Crustal Thinning in the North Sea, Ph.D. thesis (unpublished), University of Cambridge, pp. 96.Google Scholar
  5. Barton, P. J., 1986, The Relationship Between Seismic Velocity and Density in the Continental Crust—a Useful Constraint.Geophys. J.R. astr. Soc.,87 195–208.Google Scholar
  6. Barton, P. J., Matthews, D. H., Hall, J. and Warner, M., 1984, Moho Beneath the North Sea Compared on Normal Incidence and Wide-Angle Seismic Records,Nature, London,308, p. 55–56.Google Scholar
  7. Berckhemer, H., Baier, B., Bartelsen, H., Behle, A., Burckhardt, H., Gebrande, H., Makris, J., Menzel, H., Miller, H. and Vees, R., 1975, in: Pilger, A. and Roesler, A. (eds.),Afar — Depression of Ethiopia, Schweizerbart, Stuttgart, p. 89–107.Google Scholar
  8. Berry, M. J. and Knopoff, L., 1967, Structure of the Upper Mantle Under the Western Mediterranean Basin,J. geophys. Res.,72 3613–3626.Google Scholar
  9. Biju-Duval, B., Letouzey, J., Montadert, L., Courrier, P., Mugniot, J. F. and Sancho, J., 1974, Geology of the Mediterranean Sea Basins, in: Burk, C. A. and Drake, C. L. (eds.),The Geology of Continental Margins, Springer-Verlag, New York, p. 695–721.Google Scholar
  10. Boillot, G., 1981,Geology of Continental Margins, Longman Inc., New York, pp. 115.Google Scholar
  11. Boillot, G., Girardeau, J. and Kornprobst, J., 1988, Rifting of the Galicia Margin: Crustal Structure and Emplacement of Mantle Rocks on the Seafloor, in: Boillot, G. and Winterer, E. al., Proceedings of the Ocean Drilling Program, Scientific Results volume 103, College Station, Texas (Ocean Drilling Program), p. 741–755.Google Scholar
  12. Boillot, G., Girardeau, J. and Recq, M., 1989, The West Galicia Margin, New Geodynamic Concepts: Unroofing of the Upper Mantle and Undercrusting by Serpentinite Beneath Continental Rifts (Abstract),Annls. Geophys., Special Issue, 28.Google Scholar
  13. Chapman, C. H., 1985, Ray Theory and its Extensions: WKBJ and Maslov Seismograms,J. Geophys., 58, 27–43.Google Scholar
  14. Chapman, C. H. and Drummond, R., 1982, Body Wave Seismograms in Inhomogeneous Media Using Maslov Asymptotic Theory,Bull. seism. Soc. Am. 72, S277-S317.Google Scholar
  15. Cheadle, M. J., McGeary, S., Warner, M. R. and Matthews, D. H., 1987, Extensional Structures on the Western U. K. Continental Shelf: a Review of Evidence from Deep Seismic Profiling, in: Coward, M. P., Dewey, J. F. and Hancock, P. L. (eds.),Continental Extensional Tectonics, Geological Society Special Publication no. 28. p. 445–465.Google Scholar
  16. Cohen, C. R., 1980, Plate Tectonic Model for the Oligo-Miocene Evolution of the Western Mediterranean,Tectonophys. 68, 283–311.Google Scholar
  17. Della Vedova, B. and Pellis, G., 1983,Realizzazione della Mappa di Flusso di Calore per i Mari Italiani, Atti Convegno Scientif. Naz. P. F. Oceanographia, C. N. R., Roma.Google Scholar
  18. Dewey, J. F., Pitman, W. C. III, Ryan, W. B. F. and Bonnin, J., 1973, Plate Tectonics and the Evolution of the Alpine System,Bull. geol. Soc. Am. 84, 3137–3180.Google Scholar
  19. Duschenes, J., 1983, Aspects of Ocean Bottom Seismology, Ph.D. thesis (unpublished), University of Cambridge, pp. 122.Google Scholar
  20. Duschenes, J., Potts, C. and Rayner, M., 1985, Cambridge Deep Ocean Geophone,Mar. Geophys. Res. 7, 455–466.Google Scholar
  21. Duschenes, J., Sinha, M. C. and Louden, K. E., 1986, A Seismic Refraction Experiment in the Tyrrhenian Sea,Geophys. J. R. astr. Soc. 85 139–160.Google Scholar
  22. Egger, A. Demartin, M. Ansorge, J., Banda, E. and Maistrello, M., 1988, The Gross Structure of the Crust under Corsica and Sardinia,Tectonophys. 150 363–389.Google Scholar
  23. Erikson, A. J., 1970, The Measurement and Interpretation of Heatflow in the Mediterranean and Black Sea, Ph.D. thesis (unpublished), Massachussetts Institute of Technology, pp. 271.Google Scholar
  24. Fahlquist, D. A. and Hersey, J. B., 1969, Seismic Refraction Measurements in the Western Mediterranean Sea,Bull. Inst. Oceanographique (Monaco)67 no. 1386, pp 52.Google Scholar
  25. Finetti, I. and Morelli, C., 1972, Wide Scale Digital Seismic Exploration of the Mediteranean Sea,Bull. Geof. Teor. Appl. XIV, no. 56, 291–342.Google Scholar
  26. Foucher, J.-P., Le Pichon, X. and Sibuet, J.-C., 1982, The Ocean-Continent Transition in the Uniform Lithospheric Stretching Model: Role of Partial Melting in the Mantle,Phil. Trans. R. Soc. Lond. A 305 27–43.Google Scholar
  27. Galson, D. A. and Mueller, S., 1985, in:Proceedings of the Second Workshop on the European Geotraverse (EGT) Project — the Southern Segment, European Science Foundation, Strasbourg, p. 3–5.Google Scholar
  28. Galson, D. A. and Mueller, S., 1987,The European Geotraverse (EGT) Project: A Progress Report, Amer. Geophys. Union Geodynamics Series, vol. 16, p. 253–272.Google Scholar
  29. Giese, P., 1985, The Structure of the Upper Lithosphere between the Ligurian Sea and the Southern Alps, in: Galson, D. A. and Mueller, S. (eds.), Proceedings of the Second Workshop on the European Geotraverse (EGT) Project — the Southern Segment, European Science Foundation, Strasbourg, p. 143–153.Google Scholar
  30. Ginzburg, A., Makris, J. and Nicolich, R., 1986, European Geotraverse: A Seismic Refraction Profile Across the Ligurian Sea,Tectonophys.,126, 85–97.Google Scholar
  31. Ginzburg, A., Whitmarsh, R. B., Roberts, D. G., Montadert, L., Camus, A. and Avedik, F., 1985, The Deep Seismic Structure of the Northern Continental Margin of the Bay of Biscay,Annls. Geophys. 3, no. 4, 499–510.Google Scholar
  32. Henry, W. J., Mechie, J., Maguire, P. K. H., Khan, M. A., Prodehl, C., Keller, G. R. and Patel, J., 1990, A Seismic Investigation of the Kenya Rift Valley,Geophys. J. Int. 100, 107–130.Google Scholar
  33. Hinz, K., 1972, Results of Seismic Refraction Investigations (Project ANNA) in the Western Mediterranean Sea, South and North of the Island of Mallorca,Bull. Centre Rech. Pau — SNPA 6, no. 2, 405–426.Google Scholar
  34. Hinz, K., 1973, Crustal Structure of the Balearic Sea,Tectonophys. 20, 295–302.Google Scholar
  35. Hinz, K., Dostmann, H. and Fitsch, J., 1982, The Continental Margin of Morocco: Seismic Sequences, Structural Elements and Geological Development, in: Von Rad, U., Hinz, K., Santhein, M. and Seibold, E. (eds.),Geology of the Northwest African Continental Margin, Springer-Verlag, New York, p. 34–60.Google Scholar
  36. Hirn, A., Steinmetz, L. and Sapin, M., 1977, A Long Range Seismic Profile in the Western Mediterranean Basin: Structure of the Upper Mantle,Annls. Geophys 33, 373–384.Google Scholar
  37. Horvath, F., Berckhemer, H. and Stegena, L., 1981, Models of Mediterranean Back-Arc Basin Formation,Phil. Trans. R. Soc. Lond. A300, 383–402.Google Scholar
  38. Hughes, V. J., White, R. S. and Jones., E. J. W., 1984, Seismic Velocity Structure of the Northwest Scottish Continental Margin: Some Constraints Imposed by Amplitude Studies,Annls. Geophys. 2 669–678.Google Scholar
  39. Karig, D., 1971, Origin and Development of Marginal Basins in the Western Pacific,J. Geophys. Res. 76 no. 11, 2542–2561.Google Scholar
  40. Keen, C. E. and de Voogd, B., 1988, The Continent-Ocean Boundary at the Rifted Margin off Eastern Canada: New Results from Deep Seismic Reflection Studies,Tectonics 7 107–124.Google Scholar
  41. Klitgord, K. D. Hutchinson, D. R. and Schouten, H., 1988, US Continental Margin; Structure and Tectonic Framework, in: Sheridan, R. E. and Grow, J. A. (eds.),The geology of North America, Vol. I–2,The Atlantic continental margin, Geological Society of America, Boulder, Colorado, p. 19–55.Google Scholar
  42. Le Douraran, S., Burrus, J. and Avedik, F., 1984, Deep Structure of the North-Western Mediterranean Basin: Results of a Two-Ship Seismic Survey,Mar. Geol. 55 325–345.Google Scholar
  43. Ludwig, J. W., Nafe, J. E. and Drake, C. L., 1970, Seismic Refraction, in: Maxwell, A. E. (ed.),The Sea, vol. 4, Wiley, New York, p. 53–84.Google Scholar
  44. Lüschen, E., Wenzel, F., Sandmeier, K.-J., Menges, D., Rühl, T., Stiller, M., Janoth, W., Keller, F., Söllner, W., Thomas, R., Krohe, A., Stenger, R., Fuchs, K., Wilhelm, H. and Eisbacher, G., 1987, Near Vertical and Wide-Angle Seismic Surveys in the Black Forest, SW Germany,J. Geophys. 62 1–30.Google Scholar
  45. Markris, J., 1982, Seismic Investigations of the Northern Part of the Red Sea, Institut für Geophysik, Universität Hamburg, Hamburg, Germany, pp. 137.Google Scholar
  46. Mauffret, A., Fail, J. P., Montadert, L., Sancho, J. and Winnock, E., 1973, Northwestern Mediterranean Sedimentary Basin from Seismic Reflection Profiles,Am. Assoc. Petroleum Geologists Bull. 57 2245–2262.Google Scholar
  47. McKenzie, D. P. and Bickle, M. J., 1988, The Volume of Melt Generated by Extension of the Lithosphere,J. Petrol. 29, 625–679.Google Scholar
  48. Meissner, R., 1965, Multiple Events in Refraction Shooting,Geophys. Prosp. 13, 617–658.Google Scholar
  49. Meissner, R., 1986,The Continental Crust — a Geophysical Approach, International geophysics series, vol. 34, Academic Press, London, pp. 426.Google Scholar
  50. Mooney, W. D. and Brocher, T. M., 1987, Coincident Seismic Reflection/Refraction Studies of the Continental Lithosphere: a Global Review,Rev. Geophys. 25, 723–742.Google Scholar
  51. Morgan, J. V., 1988, Seismic Studies over Continental Margins, Ph.D. thesis (unpublished), University of Cambridge, pp. 138.Google Scholar
  52. Morgan, J. V., Barton, P. J. and White, R. S., 1989, The Hatton Bank Continental Margin — III Structure from Wide-Angle OBS and Multichannel Seismic Refraction Profiles,Geophys. J. Int. 98, 367–384.Google Scholar
  53. Mueller, S., 1988, European Geotraverse (EGT) Project,Journal of the European Science Foundation,18, 6–7.Google Scholar
  54. Mutter, J. C. and Zehnder, C. M., 1988, Deep Crustal Magmatic Processes: The inception of Seafloor Spreading in the Norwegian-Greenland Sea, in:Early Tertiary Volcanism and the Opening of the North Atlantic, Spec. Publ. Geol. Soc. Lond., 39, p. 34–48.Google Scholar
  55. Mutter, J. C., Buck, W. R. and Zehnder, C. M., 1988, Convective Partial Melting I — A Model for the Formation of Thick Basaltic Sequences During the Initiation of Spreading,J. geophys. Res. 93, 1031–1048.Google Scholar
  56. Nafe, J. E. and Drake, C. L., 1957, Variation with Depth in Shallow and Deep Water Marine Sediments of Porosity, Density and the Velocities of Compressional and Shear Waves, Geophysics22, 523–552.Google Scholar
  57. Nafe, J. E. and Drake, C. L., 1962, Physical Properties of Marine Sediments, in: Hill., M. N. (ed),The Sea, vol. 3, Wiley, New York, p 794–815.Google Scholar
  58. Olsen, K., Keller, G. R. and Stewart, J. N., 1979, Rio Grande Rift, in: Riecker (ed.),Rio Grande Rift, Special publication 23, AGU, Washington D.C., p 127–144.Google Scholar
  59. Payo, G., 1969, Crustal Structure of the Mediterranean Sea part II—Phase Velocity and Travel Times,Bull. seism. Soc. Am. 59, 23–42.Google Scholar
  60. Peirce, C., 1990, Crustal Structure of the Africa-Eurasia Plate Boundary, Ph.D. thesis (unpublished), University of Cambridge, pp. 248.Google Scholar
  61. Powell, C. M. R. and Sinha, M. C., 1987, The PUMA Experiment West of Lewis, U.K.,Geophys. J. R. astr. Soc. 89, 259–264.Google Scholar
  62. Prodehl, C., 1981, Structure of the Crust and Upper Mantle Beneath the Central Rift System, Tectonophys.80, 255–269.Google Scholar
  63. Prodehl, C. and Giese, P., 1985, A Lithospheric Seismic Experiment along the European Geotraverse through Central Europe in 1986, in: Galson, D. A. and Mueller, S. (eds.),Proceedings of the Second workshop on the European Geotraverse (EGT) Project — the Southern Segment, European Science Foundation, Strasbourg, p 173–181.Google Scholar
  64. Ryan, W. B. F., Hsü, K. J.,et al., 1973,Initial Reports of the Deep Sea Drilling Project, volume XIII, Washington D.C., U.S. Govt. Printing office, pp. 1447.Google Scholar
  65. Shipboard Scientific Party, 1973, Boundary of Sardinia Slope with Balearic Abyssal Plane — Sites 133–134, in: Ryan, W. B. F., Hsü, K. J.,et al., Initial Reports of the Deep Sea Drilling Project, volume XIII, Washington D.C., U.S. Govt. Printing Office p. 465–495.Google Scholar
  66. Spudich, P. and Orcutt, J., 1980, A New Look at the Seismic Velocity Structure of the Oceanic Crust,Rev. Geophys.,18 627–645.Google Scholar
  67. Stanley, D. J., McCoy, F. W. and Diester-Haass, L., 1974, Balearic Abyssal Plain: an Example of Modern Basin Plain deformation by Salt Tectonism,Mar. Geol. 17 183–200.Google Scholar
  68. Steinmetz, L., Ferrucci, F., Hirn, A., Morelli, C. and Nicolich, R., 1983, A 550 Km Long Moho Traverse in the Tyrrhenian Sea from OBS Recorded Pn Waves,Geophys. Res. Letts. 10 428–431.Google Scholar
  69. Talwani, M., Worzel, J. L. and Landisman, M., 1959, Rapid Gravity Calculations for Two-Dimensional Bodies with Application to the Mendocino Submarine Fracture Zone,J. Geophys. Res. 64, 49–59.Google Scholar
  70. Thomson, C. J. and Chapman, C. H., 1986, End-Point Contributions to Synthetic Seismograms,Geophys. J. R. astr. Soc. 87 285–294.Google Scholar
  71. Toksöz, M. N. and Hsui, A. T., 1978, Numerical Studies of Back-Arc Convection and the Formation of Marginal Basins,Tectonophys,.50 177–196.Google Scholar
  72. Wang, C. Y., Hwang, W. T. and Shi, Y., 1989, Thermal Evolution of a Rift Basin: The Tyrrhenian Sea,J. Geophys. Res. 94 3991–4006.Google Scholar
  73. Weigel, W., Wissmann, G. and Goldflam, P., 1982, Deep Seismic Structure (Mauritania and Central Morocco), in: Seibold, E. (ed.),Geology of the Northwest African Margin, Springer-Verlag, New York, p. 132–159.Google Scholar
  74. Wenzel, F., Sandmeier, K. J. and Wälde, W., 1987, Properties of the Lower Crust from Modelling Refraction and Reflection Data,J. Geophys. Res. 92 11 575–11 583.Google Scholar
  75. White, R. S., 1979, Oceanic Upper Crustal Structure from Variable Angle Seismic Reflection-Refraction Profiles,Geophys. J. R. astr. Soc. 57 683–726.Google Scholar
  76. White, R. S. and McKenzie, D. P., 1989a, Volcanism at Rifts,Scient. Am. 260 no. 7, 62–71.Google Scholar
  77. White, R. S. and McKenzie, D. P., 1989b, Magmatism at Rift Zones: The Generation of Volcanic Continental Margins and Flood Basalts,J. geophys. Res. 94 7685–7729.Google Scholar
  78. White, R. S., Detrick, R. S., Sinha, M. C. and Cormier, M. H., 1984, Anomalous Seismic Crustal Structure of Oceanic Fracture Zones,Geophys. J. R. astr. Soc. 79 779–798.Google Scholar
  79. White, R. S., Spence, G. D., Fowler, S. R., McKenzie, D. P., Westbrook, G. K. and Bowen, A. N., 1987, Magmatism at Rifted Continental Margins, Nature, London,330, 439–444.Google Scholar
  80. Whitmarsh, R. B., Avedik, F. and Saunders, M. R., 1986, The Seismic Structure of Thinned Continental Crust in the Northern Bay of Biscay,Geophys. J. R. astr. Soc. 86 589–602.Google Scholar
  81. Ye, S., 1986, Die Struktur der Erdkruste unter Südsardinien und dem Südlichen Angrenzenden Sardinischen Kanal aus Refraktionsseismischen Messingen, Diploma-Thesis, ETH, Zürich, pp. 117.Google Scholar
  82. Zamarayev, S. M. and Ruzhich, V. V., 1978, On Relationships between the Baikal Rift and Adjacent Systems,Tectonophys. 45 41–47.Google Scholar

Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • C. Peirce
    • 1
  • P. J. Barton
    • 1
  1. 1.Bullard Laboratories, Department of Earth SciencesUniversity of Cambridge, Madingley RiseCambridgeUK

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