Sedimentation in the Atlas Gulf II: Mid-Cretaceous Events

  • Paul Wurster
  • Johannes Stets

Abstract

According to paleogeographic research in the Cretaceous sequence of western Morocco, a funnel-like Atlas Gulf existed between Agadir and Safi, stretching farther toward the east in the present High Atlas region. Bordered by structural highs of the Anti-Atlas in the south, and the Moroccan Meseta in the north, the Atlas depression subsided slowly and continuously. Within the Atlas Gulf transgressions and regressions of the Cretaceous Atlantic can be recorded by an almost synchronous migration of the littoral zones. Distribution of shallow-marine, littoral, lagoonal, deltaic, coastal plain and fluvial facies are pointed out. Regimes, processes and kinematics of sedimentation are discussed by a sedimentation model. Significant events in Barremian, Aptian, and Turonian time are explained by an accelerated rise of the sea level. Our sedimentation model proposes eustasy as a major cause for the Mid-Cretaceous events, documented in the sedimentary record. Relations to similar rock sequences in the Sahara Basin, at the opposite margin of the Atlantic Ocean, and in the deep-sea basins, are discussed with regard to the Atlas Gulf sedimentation model.

Keywords

Sedimentation Lime Gypsum Lithology Stratigraphy 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Ambroggi R (1963) Etude géologique du versant méridional du Haut Atlas occidental et de la plaine du Souss. Notes Mém Serv Géol Maroc 157: 321 ppGoogle Scholar
  2. Arthur MA (1979) North Atlantic Cretaceous black shales: the record at site 398 and a brief comparison with other occurrences. Init Rep Deep Sea Drilling Project 47: 719–751Google Scholar
  3. Behrens M, Krumsiek K, Meyer DE, Schäfer A, Siehl A, Stets J, Wurster P (1978) Sedimentationsabläufe im Atlas-Golf ( Kreide Küstenbecken Marokko ). Géol Rundsch 67: 424–453Google Scholar
  4. Busson G (1970) Le Mésozoique saharien, II, Essai de synthèse des données des sondages algéro-tunesiens. ed CNRS, 811 pp, ParisGoogle Scholar
  5. Busson G (1972) Principes, méthodes et résultats d’une étude stratigraphique du Mésozoic saharien. Mém Mus Hist Nat C 26: 441 ppGoogle Scholar
  6. Chenet PY, Francheteau J (1980) Bathymetric reconstruction method: application to the central Atlantic basin between 10° N and 40° N. Init Rep Deep Sea Drilling Project 51, 52, 53: 1501–1513Google Scholar
  7. Choubert G, Faure-Muret A (1962) Evolution du domaine Atlasique Marocain dépuis les temps Paléozoiques. In: Durand-Delga M (ed) Livre á la mémoire P Fallot. Mém H-S Soc Géol Fr 1: 447–527Google Scholar
  8. Choubert G, Faure-Muret A (1963) Evolution du domaine Atlasique Marocain dépuis les temps Paléozoiques. In: Durand-Delga M (ed) Livre á la mémoire P Fallot. Mém H-S Soc Géol Fr 1: 447–527Google Scholar
  9. Jansa LF, Wade JA (1975) Geology of the continental margin off Nova Scotia and Newfoundland. Geol Surv Can Pap 74–30: 51–105Google Scholar
  10. KlitzschE (1970) Die Strukturgeschichte der Zentralsahara. Geol Rundsch 59: 459–527CrossRefGoogle Scholar
  11. Lancelot Y, Winterer EL (1980) Evolution of the Moroccan Oceanic Basin and adjacent continental margin — a synthesis. Init Rep Deep Sea Drilling Project 50: 801–821Google Scholar
  12. Makris J, Demnati A (1977) Deep seismic soundings in Morocco and a crust and upper mantle model deduced from seismic and gravity data. 15 pp (unpubl manuscript)Google Scholar
  13. Michard A (1976) Eléments de Géologie marocaine. Not et Mém Serv Géol Maroc 252: 408 ppGoogle Scholar
  14. Pitman WCIII (1978) Relationship between eustasy and stratigraphic sequences of passive margins. Géol Soc Am Bull 89: 1389–1403CrossRefGoogle Scholar
  15. Reineck HE, Singh IB (1973) Depositional sedimentary environments. Springer, Berlin Heidelberg New YorkGoogle Scholar
  16. Sclater JG, Hellinger S, Tapscott C (1977) The paleobathymetry of the Atlantic Ocean from the Jurassic to the present. J Geol 85: 509–552CrossRefGoogle Scholar
  17. Tucholke BE, Vogt PR (1979) Western North Atlantic: sedimentary evolution and aspects of tectonic history. Init Rep Deep Sea Drilling Project 43: 791–825Google Scholar
  18. Vail PR, Mitchum RMJr, Thompson SIII (1977) Seismic stratigraphy and global changes of sea level. Am Assoc Petrol Géol Mém 26: 49–212Google Scholar
  19. Van Houten FB (1980) Latest Jurassic — Early Cretaceous regressive facies, northeast Africa craton. Am Assoc Petrol Géol Bull 64: 857–867Google Scholar
  20. Wiedmann J, Butt A, Einsele G (1978) Vergleich von marokkanischen Kreide-Küstenaufschlüssen und Tiefseebohrungen (DSDP): Stratigraphie, Paläoenvironment und Subsidenz an einem passiven Kontinentalrand. Géol Rundsch 67: 454–508Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1982

Authors and Affiliations

  • Paul Wurster
  • Johannes Stets
    • 1
  1. 1.Géologisches Institute der Universität BonnBonn 1Germany

Personalised recommendations