Petrogénesis de las ofiolitas cubanas

  1. J.A. Proenza 1
  2. A. García-Casco 2
  3. Y. Rojas-Agramonte 3
  4. M. Iturralde-Vinent 4
  5. C. Marchesi 2
  6. C. Lázaro 2
  7. J.M. González-Jiménez 2
  8. I.F. Blanco-Quintero 5
  9. L. Butjosa 1
  10. J. Cárdenas-Párraga 2
  11. F. Gervilla 1
  12. N. Pujol-Solà 1
  13. J. Farré-de-Pablo 1
  14. A.I. Llanes-Castro 6
  15. K. Núñez Cambra 6
  1. 1 Universitat de Barcelona
    info

    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

  2. 2 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

  3. 3 Universität Mainz
  4. 4 Academia de Ciencias de Cuba
  5. 5 Universitat d'Alacant
    info

    Universitat d'Alacant

    Alicante, España

    ROR https://ror.org/05t8bcz72

  6. 6 Instituto de Geología y Paleontología, La Habana, Cuba
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Revista:
Geotemas (Madrid)

ISSN: 1576-5172

Año de publicación: 2021

Título del ejemplar: X Congreso Geológico de España

Número: 18

Páginas: 1057

Tipo: Artículo

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Otras publicaciones en: Geotemas (Madrid)

Resumen

The Cuban ophiolite belt, the largest in Iberoamérica, represents slices of oceanic lithosphere (~ 138 to 90 Ma) obducted onto the North American continental paleo-margin in Latest Cretaceous to Eocene times during the collision of the Caribbean volcanic arc with the Jurassic-Cretaceous passive margins of the continental Maya block and the Bahamas platform. The ophiolite assemblages are highly dismembered, but the mantle tectonites, Moho Transition Zone and crustal sections can be identified as in archetypical ophiolites. Geochemical data suggest that the ophiolitic complexes all along the island contain remnants of ancient oceanic lithosphere formed in a variety of geodynamic settings associated with active plate margins, such as mid-ocean ridges (MOR), oceanic fracture-zone–transform-fault, and supra-subduction zone. However, the composition of mantle peridotites, chromitites and plutonic rocks, as well as volcanic rocks (with FAB, boninite, LOTI, IAT, CAB and BABB affinities) clearly indicates a predominance of oceanic lithosphere produced in the forearc above the subducting Atlan- tic-related Proto-Caribbean oceanic basin during subduction initiation in the Early Cretaceous. These SSZ-type ophiolites hence form the basement of the leading edge of the Pacific-derived Caribbean plate and are related to the birth and evolution of the Caribbean intra-oceanic volcanic arc (~135-70 Ma).

Fuente de los datos: Dialnet