Bulletin Volcanologique

, Volume 44, Issue 3, pp 359–375 | Cite as

New K-Ar ages, chemical analyses and magnetic data of rocks from the islands of santa maria (azores), porto santo and madeira (madeira archipelago) and gran canaria (Canary Islands)

  • G. Feraud
  • J. Gastaud
  • H. U. Schmincke
  • G. Pritchard
  • J. Lietz
  • U. Bleil


K/Ar-determinations, major and trace element chemical analyses and magnetic data are reported for rocks from Santa Maria (Azores), Madeira and Porto Santo, and Gran Canaria. Based on these data, the age of the basement of Santa Maria is believed to have formed between about 5.2. and 4.6 m.y.; the unconformably overlying pillow complex interbedded with fossiliferous calcarenites about 3.8 to 3.3 m.y. with the capping subaerial basalt being part of the same magmatic phase. The major erosional phase levelling the basement is thus approximately synchronous with the major Pliocene regression (R2) on Gran Canaria (Lietz andSchmincke, 1975), possibly indicating a widespread eustatic event. The upper part of the submarine, partly fossiliferous series of Porto Santo was dated as ca. 12 to 13 m.y., and the Quaternary age for the major basalt formation in Eastern Madeira (Watkins andAbdel Monem, 1971) is confirmed. The ages of several formations on Gran Canaria were slightly revised.

Chemical differences between basement (shield) and later posterosional series on Gran Canaria are re-emphasized by the new data, while such differences are much less pronounced between the basement and younger series on Santa Maria.


Lava Flow Canary Island Alkali Basalt Pillow Lava Geomagnetic Polarity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Abdel-Monem, A. A., Fernandez, L. A. andBoone, G. M., 1975,K-Ar Ages from the Eastern Azores Group (Santa Maria, Saõ Miguel and the Formigas Islands). Lithos,8, p. 247–254.CrossRefGoogle Scholar
  2. ————— andGast, P. W., 1971,Potassium-Argon Ages, Volcanic Stratigraphy and Geomagnetic Polarity History of the Canary Islands: Lanzarote, Fuerteventura, Gran Canaria and La Gomera. Amer. Jour. Sci.,271, p. 490–521.CrossRefGoogle Scholar
  3. Aires-Barros, L., Matias, M. J. andMiranda, A. M., 1974,Preliminary Note on the Petrology of Madeira Island. Bol. Mus. Lab. Mineral. Geol. Lisboa,14, p. 5–27.Google Scholar
  4. Bonnin, J., 1978,Evolution géodynamique de la ligne Açores-Gibraltar. Thèse, Univ. Paris, 200 pp.Google Scholar
  5. Dietrich, G. andUlrich, 1967,Atlas zur Ozeanographie. Bibliographisches Institut, Mannheim, p. 1–77.Google Scholar
  6. Feraud, G., 1977,Contribution à la datation du volcanisme de L’Archipel de Açores par la méthode Potassium Argon. Conséquences géodynamiques. Thèse, Univ. Paris, 126 pp.Google Scholar
  7. ————— andBougalt, H., 1977,Sur quelques datations du volcanisme alcalin de la ligne Azores-Gibraltar et leur contexte géodinamique. C.R. Acad. Sc. Paris,285, p. 1203–1206.Google Scholar
  8. ————— andAllegre, C. J., 1980,K/Ar Ages and Stress Pattern in Azores: Geodynamic Implications. Earth Planet. Sci. Lett.,46, p. 275–286.CrossRefGoogle Scholar
  9. Furnes, H. andSturt, B. A., 1976,Beach/Shallow Marine Hyaloclastite Deposits and Their Geological Significance-An Example from Gran Canaria. Jour. Geol.,84, p. 439–453.CrossRefGoogle Scholar
  10. Hughes, D. J. andBrown, G. C., 1972,Basalts from Madeira. Contr. Mineral. and Petrol.,37, p. 91–109.CrossRefGoogle Scholar
  11. Krejci-Graf, 1964,Die Mittelatlantischen Vulkaninseln. Mitt. Geol. Ges., Wien,57, p. 401–403.Google Scholar
  12. Laughton, A. S., Roberts, D. G. andGraves, R., 1975,Bathymetry of the Northeastern Atlantic: Mid-Atlantic Ridge to Southwest Europe. Deep-Sea Research,22, p. 791–810.Google Scholar
  13. ————— andWhitmarsh, R. B., 1974,The Azores-Gibraltar Plate Boundary. NATO Advanced Study Institute, Reykjavik, p. 63–81.Google Scholar
  14. Lietz, J. andSchmincke, H. U., 1975,Miocene-Pliocene Sea Level Changes and Volcanic Episodes on Gran Canaria (Canary Islands) in the Light of New K-Ar Ages. Paleogeogr. Paleoclim. Paleoecol.,18, p. 213–239.CrossRefGoogle Scholar
  15. ————— andSchwarzbach, M., 1970,Neue Fundpunkte von marinem Tertiär auf der Atlantikinsel Porto Santo (Madeira-Archipel). N. Jb. Geol. Paläont. Mh. H.,5, p. 271–282.Google Scholar
  16. Macedo, C. R., Costa, V. andFerreira, M., 1974,K/Ar Ages on the Central Atlantic Islands. Intern. Meet. for Geochronology, Cosmochronology and Isotope Geology, Paris.Google Scholar
  17. McDougall, I., 1977,The Present Status of the Geomagneitc Polarity Time Scale. Austr. Nat. Univ. Res. School Earth Sci. Publ. No. 1288, 34 pp.Google Scholar
  18. ————— andSchmincke, H. U., 1976,Geochronology of Gran Canaria, Canary Islands: Age of Shield Building Volcanism and Other Magmatic Phases. Bull. Volcanol.,40, p. 1–21.CrossRefGoogle Scholar
  19. Mitchell-Thome, R.C., 1974,The Sedimentary Rocks of Macaronesia. Geol. Rundschau,63, p. 1179–1216.CrossRefGoogle Scholar
  20. Pitman, W. C. andTalwani, M., 1972,Sea-Floor Spreading in the North-Atlantic. Geol. Soc. Am. Bull.,83, p. 619–646.CrossRefGoogle Scholar
  21. Rothe, P. andSchmincke, H. U., 1968,Contrasting Origins of the Eastern and Western Islands of the Canarian Archipelago. Nature,218, p. 1152–1154.CrossRefGoogle Scholar
  22. Schmincke, H. U., 1976.The Geology of the Canary Islands. In:Kunkel G. (ed.),Biogeography and Ecology of the Canary Islands. Junk, Holland, p. 67–184.Google Scholar
  23. -----, 1982,Volcanic and Chemical Evolution of the Canary Islands. In:V. Rad, Hinz, K., Sarnthein, M., andSeibold, E. (Eds.),Geology of the Northwest African Continental Margin. Springer Verlag, p. 273–306.Google Scholar
  24. ----- andStaudigel, H., 1976,Pillow Lavas on Central and Eastern Atlantic Islands. Bull. Soc. Géol. Fr., vol. , p. 871–883.Google Scholar
  25. ————— andWeibel, M. 1972,Chemical Study of Rocks from Madeira, Porto Santo and Saõ Miguel, Terceira (Azores). N. Jb. Miner. Abh.,117, p. 253–281.Google Scholar
  26. Searle, R. C., 1980,Tectonic Pattern of the Azores Spreading Center and Triple Junction. Earth. Plan. Sci. Lett.,51, p. 415–434.CrossRefGoogle Scholar
  27. Steiger, R. H. andJäger, E., 1977,Subcommission on Geochronology: Convention on the Use of Decay Constants in Geo- and Cosmochronology. Earth Planet. Sci. Lett.,36, p. 359–362.CrossRefGoogle Scholar
  28. Watkins, N. D. andAbdel Monem, A., 1971,Detection of the Gilsa Geomagnetic Polarity Event on the Island of Madeira, Geol. Soc. Amer. Bull.,82, p. 191–198.CrossRefGoogle Scholar
  29. Wendt, I., Kreuzer, H., Moller, P., Rad, V., Razchka, H., 1976,K/Ar Ages of Basalts from Great Meteor and Josephine Seamounts (Eastern North Atlantic). Deepsea Research,23, p. 849–862.Google Scholar
  30. Zbyszewsky, G., 1971,REconhecimento geologico da parte ocidental de ilha da Madeira. Mem. da Acad. Cien. Lisboa,15, p. 1–23.Google Scholar
  31. —————, 1972,Levantamentos geologicos na parte oriental da ilha da Madeira e nas ilhas Desertas. Mem. Acad. Cien. Lisboa,16, p. 29–40.Google Scholar
  32. ————— andTorre De Assuncao, C., 1961,Caria geologica da ilha da Santa Maria. Servicios geologicos de Portugal, Lisboa.Google Scholar

Copyright information

© Intern. Association of Volcanology and Chemistry of the Earth’s Interior 1981

Authors and Affiliations

  • G. Feraud
    • 1
  • J. Gastaud
    • 1
  • H. U. Schmincke
    • 2
  • G. Pritchard
    • 2
  • J. Lietz
    • 3
  • U. Bleil
    • 4
  1. 1.Laboratoire de Géologie et Géochimie, ERA CNRS no. 888, Fac. des Sciences de Nice, Parc ValroseNiceFrance
  2. 2.Institut für MineralogieRuhr-Universität BochumBochumW Germany
  3. 3.German Geological Advisory Group with PetrobanglaDacca 2Bangladesh
  4. 4.Institut für GeophysikRuhr-Universität BochumBochumW Germany

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