Chinese Journal of Geochemistry

, Volume 24, Issue 1, pp 9–17 | Cite as

Geochemistry of Late Cretaceous (60–67 Ma) igneous activities in the hebrides terrace seamount (guyot) area, Scotland

  • M. El-Tokhi
  • M. Omran
  • A. El-Muslem


Tholeiitic basalts in various stages of alteration were dredged from Late Cretaceous volcanic rocks (60–67 Ma) in the Hebrides Terrace seamount area in the Atlantic Ocean. These rocks are extrusive olivine basalts, including high- and low-Al basalts. High-Al basalts are depleted in MgO, CaO, Cr, Sc, V, Sr, Zr and enriched in TiO2, Na2O, Nb, Rb as compared with low-Al basalts. Petrography and bulk-rock composition (major, trace and rare-earth elements) data defined clear tholeiitic suites displaying possible liquid lines of descent related to different degrees of crystal fractionation and partial melting. Isotopic dating of dredged samples gave the guyot an age of 60–67 Ma, in support of the assumption that it was formed during the Late Cretaceous.

Key words

silicate analysis standard sample rock and mineral 


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  1. Abbey S. (1980) Studies of standard samples for use in the general analysis of silicate rocks and minerals (Part 6, 1979 edition of usable values) [J].Geol. Surv. Can. Paper. 80-14 (30 pages).Google Scholar
  2. Cox K. G., Bell J. D., and Pankhurst R. J. (1979)The Interpretation of Igneous Rocks [M]. pp. 450. George Allen and Unwin, London.Google Scholar
  3. Duncan R. A. and McDougall I. (1974) Migration of volcanism with time in the Marquesas Islands, French Polynesia [J].Earth Planet. Sci. Lett. 21, 414–420.CrossRefGoogle Scholar
  4. Dymond J. (1975) K-Ar ages of Tahiti and Moorea, Society Islands and implications for the hot-spot model [J].Geol. 3, 236–240.CrossRefGoogle Scholar
  5. Fornari D. J., Batiza R., and Allan J. F. (1987) Irregularly shaped seamounts near the east Pacific rise: Implications for seamount origin and rise axis processes. InSeamounts, Islands and Atolls [C]. (eds. Keatin et al.). Amer. Geophy. Union.43, 13–21.Google Scholar
  6. Gardner J. V., Dean W. E., and Blakely R. J. (1984) Shimada Seamount: an example of recent mid-plate volcanism [J].Geol. Soc. Amer. Bull. 95, 855–862.CrossRefGoogle Scholar
  7. Gee J., Staudigel H., and Natland J. H. (1991) Geology and petrology of Jasper Seamount [J].J. Geophys. Res. 96, 4083–4105.CrossRefGoogle Scholar
  8. Hasse K. (1991)Petrologie und Geochemie Vulkanischer Gesteine des Vesteris Seamounts und der Region um Jan Mayen, Norwegen-Gronland See [M]. pp. 131, Diplomarbit Universitate Kiel.Google Scholar
  9. Jarrard R. and Clague D. A. (1977) Implications of Pacific island and seamount ages for the origin of volcanic chains [J].Rev. Geophys. Space Phys. 15, 57–76.CrossRefGoogle Scholar
  10. Jones E. J., Ramsay A. T., Preston N. J., and Smith A. C. (1974) A Cretaceous guyot in the Rockall Trough [J].Nature. 251, 129–131.CrossRefGoogle Scholar
  11. Lonsdale P. (1985) Non-transform offsets of the Pacific Cocos plate boundary and their traces on the rise flank [J].Geol. Soc. Am. Bull. 96, 313–327.CrossRefGoogle Scholar
  12. McDougall I. (1979) Age of shield-building volcanism of Kauai and linear migration of volcanism in Hawaiian Island chain [J].Earth Planet. Sci. Lett. 46, 31–42.CrossRefGoogle Scholar
  13. Megson J. B. (1983)Marine Geophysical Investigations: Rockall Trough to Porcupine Seabight Unpublished [D]. pp. 216, Edinburgh University.Google Scholar
  14. Mertz D. F. and Renne P. R. (1995) Quaternary multi-stage alkaline volcanism at Vesteris Seamount (Norwegian-Greenland Sea): Evidence from laser step heating40Ar/39Ar experiments [J].J. Geodynamics. 19, 79–95.CrossRefGoogle Scholar
  15. Mertz D. F., Devey C. W., Todt W., Stoffers P., and Hofmann A. W. (1991) Sr-Nd-Pb isotope evidence against plume-asthenosphere mixing north of Iceland [J].Earth Planet. Sci. Lett. 107, 243–255.CrossRefGoogle Scholar
  16. Mullen E. D. (1983) MnO/TiO2/P2O5: A major element discriminant for basaltic rocks of oceanic environments and its application for petrogenesis [J].Earth Planet. Sci. Lett. 62, 53–62.CrossRefGoogle Scholar
  17. Nayudu Y. R. (1962) A new hypothesis for the origin of guyots and seamount terraces in the crust of the Pacific Basin [J].Amr. Geoph. Union. 6, 171–180.Google Scholar
  18. O’connor J. M. and Le Roex A. P. (1992) South Atlantic hotspot-plume systems: 1. Distribution of volcanism in time and space [J].Earth Planet. Sci. Lett. 113, 343–364.CrossRefGoogle Scholar
  19. Omran M. A. (1990)Geophysical Studies in the Hebrides Terrace Seamount Area [D]. pp. 348, University of Aberystwyth.Google Scholar
  20. Pearce J. A. and Cann J. R. (1973) Tectonic setting of basic volcanic rocks determined using trace element analyses [J].Earth Planet. Sci. Lett. 19, 290–300.CrossRefGoogle Scholar
  21. Pearce J. A., Gorman B. E. and Birkett T. C. (1975) The TiO2-K2O-P2O5 diagram: A method of discriminating between oceanic and non-oceanic basalts [J].Earth Planet. Sci. Lett. 24, 419–426.CrossRefGoogle Scholar
  22. Pringle M. S., Staudigle H., and Gee J. (1991) Jasper Seamount: Seven million years of volcanism [J].Geology. 19, 364–368.CrossRefGoogle Scholar
  23. Ridley W. I., Rhodes J. M., Reid A. M., Jakes P., Shin C., and Bass M. N. (1974) Basalts from Leg 6 of the deep-sea drilling project [J].J. Petrol. 15, 140–159.Google Scholar
  24. Roberts D. G. (1971) New geophysical evidence on the origins of the Rockall Plateau and Trough [J].Deep Sea Res. 18, 353–360.Google Scholar
  25. Roberts D. G., Masson D. G., and Miles P. R. (1981) Age and structure of the southern Rockall Trough, new evidence [J].Earth Planet. Sci. Lett. 52, 115–128.CrossRefGoogle Scholar
  26. Scrutton R. A. and Roberts D. G. (1971) The structure of Rockall Plateau and Trough, Northeast Atlantic. InThe Geology of East Atlantic Continental Margin [C] (ed. Delany F. M.). pp. 77–87.Google Scholar
  27. Smith D. K. (1988) Shape analysis of Pacific seamounts [J].Earth Planet. Sci. Lett. 90, 457–466.CrossRefGoogle Scholar
  28. Taylor S. R. (1969) Trace element chemistry of andesites and associated calc-alkaline rocks [J].Bull. Oregon Dept. Geol. Miner. Ind. 65, 43–63.Google Scholar
  29. Turner D. L., Forbes R. B., and Naeser C. (1973) Radiometric ages of Kodiak Seamount and Giacomini Guyot, Gulf of Alaska: Implications for circum-Pacific plate [J].Science. 182, 579–581.CrossRefGoogle Scholar
  30. Winchseter J. A. and Floyd P. A. (1976) Geochemical magma type discrimination: Application to altered and metamorphosed basic igneous rocks [J].Earth. Plant. Sci. Lett. 28, 459–469.CrossRefGoogle Scholar
  31. Wood M. V., Hall J., and Hoorn B. V. (1987) Post-Mesozoic differential subsidence in the north-east Rockall Trough related to volcanicity and sedimentation. InPetroleum Geology of Northwest Europe. [C] (eds. Brooks J. and Glennie K.). pp. 677–685.Google Scholar

Copyright information

© Science Press 2005

Authors and Affiliations

  • M. El-Tokhi
    • 1
  • M. Omran
    • 1
  • A. El-Muslem
    • 2
  1. 1.Geology Dept.Mansoura UniversityDamiettaEgypt
  2. 2.Geology Dept.United Arab Emirates UniversityUnited Arab Emirates

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