El Margen Atlántico Ibérico al W de Galicia. Evolución en régimen extensional y sedimentación. (Resultados preliminares del Leg. 103, Ocean Drilling Program.)

Authors

  • G. Boillot Texas A S M. University, College Station
  • E. L. Winterer Texas A S M. University, College Station
  • A. W. Meyer Texas A S M. University, College Station
  • J. Applegate Texas A S M. University, College Station
  • M. Baltuck Texas A S M. University, College Station
  • J. A. Bergen Texas A S M. University, College Station
  • T. A. Davies Texas A S M. University, College Station
  • K. Dunham Texas A S M. University, College Station
  • C. A. Evans Equipo científico del Leg. 103, Ocean Drilling Program. Texas A S M. University, College Station
  • J. Girardeau Texas A S M. University, College Station
  • D. Goldberg Texas A S M. University, College Station
  • J. Haggerty Texas A S M. University, College Station
  • L. F. Jansa Texas A S M. University, College Station
  • J. A. Johnson Texas A S M. University, College Station
  • J. Kasahara Texas A S M. University, College Station
  • J. P. Loreau Texas A S M. University, College Station
  • E. Luna Texas A S M. University, College Station
  • H. Moullade Texas A S M. University, College Station
  • J. Ogg Texas A S M. University, College Station
  • M. Sarti Texas A S M. University, College Station
  • J. Thurow Equipo científico del Leg. 103, Ocean Drilling Program. Texas A S M. University, College Station
  • M. W. Williansom Texas A S M. University, College Station

DOI:

https://doi.org/10.3989/egeol.86422-3743

Keywords:

Continental margins, North Atlantic, Iberia.

Abstract


Leg 101 of the Ocean Drilling Program (ODP) was devoted discovering the tectonic and sedimentary evolution of the Atlantic Margin of the lberian Peninsula. A transect of five sites, with a total of 14 drill-holes was undertaken to the South of the Galicia Bank on the seaward edge of the margin. The data obtained revealed a complex history of subsidence and rifting preceding the initiation of sea floor spreading between Newfoundland and Iberia. The main findings include: 1) The Upper Jurassic-Lowermost Cretaceous shallow-water carbonate platform are the first Messozoic deposits at the margin. The «basement seismic reflector» is made-up of these carbonates. 2) The platform drowning, tilting of fault blocks and rapid subsidence preceded the spreading by as much as 25 million years. 3) A ridge of serpentiniced peridotites is located near the boundary between the oceanic and continental crusts. 4) The seismic reflector «S» does not, as widely believed represent a ductile-brinle boundary within the continental crust but is instead a reflector at the base of the synrift sediments.

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Published

1986-06-30

How to Cite

Boillot, G., Winterer, E. L., Meyer, A. W., Applegate, J., Baltuck, M., Bergen, J. A., Davies, T. A., Dunham, K., Evans, C. A., Girardeau, J., Goldberg, D., Haggerty, J., Jansa, L. F., Johnson, J. A., Kasahara, J., Loreau, J. P., Luna, E., Moullade, H., Ogg, J., Sarti, M., Thurow, J., & Williansom, M. W. (1986). El Margen Atlántico Ibérico al W de Galicia. Evolución en régimen extensional y sedimentación. (Resultados preliminares del Leg. 103, Ocean Drilling Program.). Estudios Geológicos, 42(2-3), 137–142. https://doi.org/10.3989/egeol.86422-3743

Issue

Vol. 42 No. 2-3 (1986)

Section

Articles

License

Copyright (c) 1986 Consejo Superior de Investigaciones Científicas (CSIC)

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