Generación de litosfera oceánica en ciclos de 100 Ma en peri-GondwanaOfiolitas de Marruecos e Iberia

  1. R. Arenas 1
  2. S. Sánchez Martínez 1
  3. R. Albert 2
  4. F. Haissen 3
  5. J. Fernández-Suárez 1
  6. N. Pujol-Solà 4
  7. P. Andonaegui 1
  8. R. Díez Fernández 1
  9. J.A. Proenza 4
  10. A. Garcia-Casco 5
  11. A. Gerdes 2
  1. 1 Universidad Complutense de Madrid
    info
    Universidad Complutense de Madrid

    Madrid, España

    ROR https://ror.org/02p0gd045

    Situation géographique de l'organisation Universidad Complutense de Madrid
  2. 2 Institut für Geowissenschaften, Goethe-University Frankfurt
  3. 3 Université Hassan II de Casablanca
    info
    Université Hassan II de Casablanca

    Casablanca, Marruecos

    ROR https://ror.org/001q4kn48

    Situation géographique de l'organisation Université Hassan II de Casablanca
  4. 4 Universitat de Barcelona
    info
    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

    Situation géographique de l'organisation Universitat de Barcelona
  5. 5 Universidad de Granada
    info
    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

    Situation géographique de l'organisation Universidad de Granada
Montrer des affiliations +
Revue:
Geotemas (Madrid)

ISSN: 1576-5172

Année de publication: 2021

Titre de la publication: X Congreso Geológico de España

Número: 18

Pages: 1041

Type: Article

DIALNET GOOGLE SCHOLAR lock_openAccès ouvert editor

D'autres publications dans: Geotemas (Madrid)

Objectifs de Développement Durable

Résumé

The Variscan Orogen in Iberia and the Anti-Atlas mountains in Morocco contain a set of ophiolites formed between Neopro- terozoic and Devonian times during the complex evolution of the NW African margin of Gondwana. During this time interval the margin evolved from an active margin (c. 750-500 Ma, the Avalonian-Cadomian arc), to the final collision with Laurussia to form Pangea. In this context, different ophiolites have been dated at c. 700, 600, 500 and 400 Ma. The composition of all these peri-Gondwanan ophiolites is of supra-subduction zone type, showing no evidence for preserved MORB-type oceanic lithosphere. Consequently, these ophiolites were generated in the peri-Gondwanan realm during the opening of fore-arc or back-arc basins. The peri-Gondwanan realm has been a domain where generation of oceanic or transitional lithosphere seems to have occurred at intervals of c. 100 Ma. These regularly spaced time intervals may indicate cyclic events of mantle upwelling in the peri-Gondwanan mid-ocean ridges, with associated higher subduction rates at the peri-Gondwanan tren- ches and concomitant higher rates of partial melting in the associated mantle wedges.

La source de données: Dialnet