Marine Geophysical Researches

, Volume 9, Issue 2, pp 147–163 | Cite as

Tectonics of an incipient oceanic rift

The Western extension of the Aden rift within the Gulf of Tadjoura, Republic of Djibouti
  • P. Choukroune
  • J. Francheteau
  • B. Auvray
  • J. M. Auzende
  • J. P. Brun
  • B. Sichler
  • F. Arthaud
  • J. C. Lepine


The results of 26 dives with the diving saucer Cyana in the Gulf of Tadjoura and Ghoubbet al Kharab (Republic of Djibouti) are presented. One can demonstrate that the sites of recent volcanism, tectonics and hydrothermal activity within the axial part of the Gulf of Tadjoura coincide with topographic highs trending at a high angle (azimuth 135°) with respect to the average trend of the axial trough of the Gulf (azimuth 080°). The highs owe their relief to both volcanism and normal faulting along a trend of 130–140°. Recent faulting on the bounding walls of the axial trough is also found along a trend of 130–140° where the faults interfere with another set of apparently older faults trending 070° parallel to the axial trough. Spacing between the active zones of the Gulf is regular and about 30 km. No evidence for transform faulting has been found, in contradiction to all previous kinematic models of the Gulf of Tadjoura. There is evidence that the presently active phase of opening associated with 130–140° faults is less than 0.7 my old and that there was an older phase associated with 070°–080° faults creating the main trough of the Gulf. The basaltic lavas created during the two phases have evolved from transitional to tholeiitic.


Gulf of Tadjoura submersible oceanic rift tectonics 


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  1. Allan, T.D. and Morelli, C., 1970, The Red Sea, in The Sea, Vol. 4, Part II, edited by Maxwell, J. Wiley and Sons, Inc., pp. 493–541.Google Scholar
  2. Anonymous, 1965, The World Rift System, Geological Survey of Canada. Paper 66-14, 471 pp.Google Scholar
  3. Anonymous, 1970, The Report of the Red Sea Discussion meeting, Phil. Trans. Roy. Soc. London. A. 267, 417 pp.Google Scholar
  4. Anonymous, 1971, Beiträge zur Geologie der Danakil-Senke (NE-Äthiopien). Beith. Geol. Jb. 116. Hannover 1971, 199 pp.Google Scholar
  5. Anonymous 1973, Numero Special sur l'Afar, Revue de Géographie physique et de Géologie dynamique. Vol. XV, fasc. 4. pp. 339–495.Google Scholar
  6. Pilger, A. and Rösler, A., (eds.), Afar Depression of Ethiopia. 2 volumes. Schweizerbart (Stuttgart), 416 pp.Google Scholar
  7. Ramberg I.B. and E.R. Newmann (1978). Tectonics and Geophysics of Continental Rifts. D. Reidel Publ. Co., Dordrecht, Holland, 444 pp.Google Scholar
  8. Anonymous, 1980, Colloque Rift d'Asal. Bull. Soc. Géol. Fr. tome XXII, No. 6, 795–1054.Google Scholar
  9. Popoff and Tiercelin, (1983), Rifts et fossés anciens. Bull. Centres Rech. Explor. Prod. Elf Aquitaine 7-1. 448 pp.Google Scholar
  10. Arthaud F., Choukroune P., and Robineau B., 1980, Tectonique, microtectonique et évolution structurale du Golfe de Tadjoura et du Sud de la dépression Afar (Republique de Djibouti), Bull. Soc. Geol. France. XXII, no. 6, 901–908.Google Scholar
  11. Bäcker H., Clin M., and Lange K., 1973, Tectonics in the Gulf of Tadjura, Marine Geol. 15, 309–327.Google Scholar
  12. Barberi F., Bonatti E., Marinelli G., and Varet J., 1974, Transverse Tectonics During the Split of a Continent: Data from the Afar Rift, Tectonophysics 23, 17–29.Google Scholar
  13. Barberi F. and Varet J., 1975, Recent Volcanic Units and Their Structural Significance, in Afar Depression of Ethiopia, PilgerA. and RöslerA. (eds.), Schweizerbart, Stuttgart, 1, 174–178.Google Scholar
  14. Barberi F., Ferrara G., Santacroce R., and Varet J., 1975, Structural Evolution of the Afar Triple Junction, in Afar Depression of Ethiopia, A.Pilger and A.Rösler (eds.), Schweizerbart, Stuttgart. 1, 38–54.Google Scholar
  15. Barberi F. and Varet J., 1977, Volcanism of Afar: Small Scale Plate Tectonics Implication, Geol. Soc. Am. Bull. 88, 1251–1266.Google Scholar
  16. Bhattacharji S. and Koide H., 1975, Mechanistic Model for Triple Junction Fracture Geometry, Nature 255, 21–24.Google Scholar
  17. Bonatti E., 1985, Punctform Initiation of Seafloor Spreading in the Red Sea During Transition from a Continental to an Oceanic Rift, Nature 316, 33–37.Google Scholar
  18. Choukroune P., Francheteau J., and Le Pichon X., 1978, In Situ Structural Observations along Transform Fault “A” in the FAMOUS Area, Mid-Atlantic Ridge, Geol. Soc. Amer. Bull. 89, 1013–1029.Google Scholar
  19. Choukroune P., Francheteau J., and Hekinian R., 1984, Tectonics of the East Pacific Rise near 12°50° N. A Submersible Study, Earth Planet. Sci. Lett. 68, 115–127.Google Scholar
  20. Choukroune P., Auvray B., Francheteau J., Lepine J.C., Arthaud F., Brun J.P., Auzende J.M., Sichler B., and Khobar Y., 1986, Tectonics of the Westernmost Gulf of Aden and the Gulf of Tadjoura from Submersible Observations, Nature 319, 396–399.Google Scholar
  21. Cochran R.J., 1981, The Gulf of Aden: Structure and Evolution of a Young Ocean Basin and Continental Margin, J. Geophys. Res. 86, 263–287.Google Scholar
  22. Coleman, R.G., 1974, Geological Background of the Red Sea, in R.B. Whitmarsh, O.F. Weser and D.A. Ross, (eds.), Initial Report of the Deep Sea Drilling Project, 83, 813–820.Google Scholar
  23. Courtillot V., Tapponnier P., and Varet J., 1974, Surface Features Associated with Transform Faults: A Comparison Between Observed Examples and an Experimental Model, Tectonophysics, 24, 317–329.Google Scholar
  24. Courtillot V., 1980a, Opening of the Gulf of Aden and Afar by Progressive Tearing, Phys. Earth Planet. Inter. 21, 343–350.Google Scholar
  25. Courtillot V., 1980b, Plaques, microplaques, et déchirures lithosphériques: une hiérarchie de structures tectoniques de l'échelle du globe à celle du terrain, Bull. Soc. Geol. Fr. XXII, 981–984.Google Scholar
  26. Courtillot V., Galdeano A., and Le Mouel J.L., 1980. Propagation of an Accreting Plate Boundary: A Discussion of New Magnetic Data in the Gulf of Tadjoura and Southern Afar, Earth Planet. Sci. Lett. 47, 144–160.Google Scholar
  27. Courtillot V., 1982, Propagating Rifts and Continental Break-up. Tectonics, 1, 239–250.Google Scholar
  28. Courtillot, V., Armijo, R., and Tapponnier, P., 1987, Kinematics of the Sinai Triple Junction and a Two Phase Model of Arabia-Africa Rifting, in Continental Extensional Tectonics. Geol. Soc. Special Publication 28, 559–574.Google Scholar
  29. Freund R., 1970, Plate Tectonics of the Red Sea and East Africa. Nature 228, 453.Google Scholar
  30. Girdler R.W. and Styles P., 1974, Two Stage Red Sea Floor Speading, Nature 247, 1–11.Google Scholar
  31. Girdler R.W. and Styles P., 1978, Sea Floor Spreading in the Western Gulf of Aden, Nature 271, 615–617.Google Scholar
  32. Huang P.Y. and Solomon S.C., 1987, Centroid Depth and Mechanisms of Mid-Ocean Ridge Earthquakes in the Indian Ocean, Gulf of Aden and Red Sea, J. Geophys. Res. 92, 1361–1382.Google Scholar
  33. Juteau Th., Eissen J.P., Monin A.S., Zonenshain L.P., Sorokhtin O.G., Maveenkov V.V. and Almukhanmedov A.I., 1983. Structure et Pétrologie du Rift axial de la Mer Rouge vers 18o Nord: Résultats de la Campagne Soviétique de plongées avec submersible (1980). Bull. Centre Rech. Explor. Prod. Elf Aquit. 7, 125–448.Google Scholar
  34. Laughton A.S., Whitmarsh R.B., and Jones M.T., 1970, The Evolution of the Gulf of Aden, Phil. Trans. Roy. Soc. London 267, 227–266.Google Scholar
  35. Le Pichon X. and Francheteau J. 1978, A Plate Tectonic Analysis of the Red Sea-Gulf of Aden Area, Tectonophysics 46, 369–406.Google Scholar
  36. Lepine J.C., Ruegg J.C., and Anis A.M., 1980, Sismicité du Rift d'Asal-Ghoubbet pendant la crise sismo-volcanique de Novembre 1978, Bull. Soc. Géol. Fr. XXII, 809–816.Google Scholar
  37. McKenzie D.P., Davies D., and Molnar P., 1970, Plate Tectonics of the Red Sea and East Africa, Nature 226, 243–248.Google Scholar
  38. Mohr P.A., 1970, The Afar triple Junction and Sea Floor Spreading, J. Geophys. Res. 75, 7340–7352.Google Scholar
  39. Needham H.D., Choukroune P., Cheminée J.L., Le Pichon X., Francheteau J., and Tapponnier P., 1976, The accreting Plate Boundary: Ardoukoba Rift and the Oceanic Rift Valley, Earth Planet. Sci. Lett. 28, 439–453.Google Scholar
  40. Richard, O., 1979, Etude de la transition dorsale océanique, rift émergé: le golfe de Tadjoura (Rép. de Djibouti). Thèse 3è cycle. Orsay. 179 pp. (unpublished).Google Scholar
  41. Ruegg J.C. and Lepine J.C., 1983, A Seismic Gap along an Accreting Plate Boundary: Example of the Djibouti Ridge, Afar East Africa. Geophys. Res. Lett. 10, 381–384.Google Scholar
  42. Sichler B., 1980, La bielette Danakile: un modèle pur l'évolution géodynamique de l'Afar, Bull. Soc. Géol. Fr. XXII, 925–334.Google Scholar
  43. Stieltjes L., Joron J.L., Treuil M., and Varet J., 1976, Le Rift d'Asal segment de dorsale émergée: discussion pétrologique et géochimique, Bull. Soc. Géol. Fr. XVIII, 851–862.Google Scholar
  44. Styles P., and Hall S.A., 1980, A Comparison of the Seafloor Spreading Histories of the Western Gulf of Aden and the Central Res Sea, Accad. Naz. Lincei 47, 585–606.Google Scholar
  45. Tamsett, D., 1984, Spreading Centres and Fracture Zones in the Gulf of Aden, Ph.D. Thesis. University of Newcastle upon Tyne.Google Scholar
  46. Tamsett, D. and Searle, R.C., 1988, Structure and Development of the Mid-Ocean Ridge Plate Boundary in the Gulf of Aden: Evidence from GLORIA Sidescan Sonar, J. Geophys. Res. (in press).Google Scholar
  47. Tazieff H., Varet J., Barberi F., and Giglia G., 1972, Tectonic Significance of the Afar Depression, Nature 235, 144–147.Google Scholar
  48. Zonenshain L., Monin A., and Sorokhtin G., 1981, Tectonique du Rift de la Mer Rouge à 18° W. Geotektonika 2, 3–22 (in Russian).Google Scholar

Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • P. Choukroune
    • 1
  • J. Francheteau
    • 2
  • B. Auvray
    • 1
  • J. M. Auzende
    • 3
  • J. P. Brun
    • 1
  • B. Sichler
    • 3
  • F. Arthaud
    • 4
  • J. C. Lepine
    • 2
  1. 1.CAESSUniversité de Rennes IRennes CedexFrance
  2. 2.IPGPUniversité de Paris 7Paris CedexFrance
  3. 3.IFREMER. COBBrest CedexFrance
  4. 4.USTL. Université de MontpellierMontpellier CedexFrance

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