Planeta Rica, NW Colombiauna ofiolita de zona de supra-subducción del Jurásico Tardío

  1. C. Ramírez-Cárdenas 1
  2. M. Weber 1
  3. M. Tobón 1
  4. J.A. Proenza 2
  5. A. Beltrán-Triviño 3
  6. N. Pujol-Solà 2
  7. S. Betancur 1
  8. A. von Quadt 4
  9. J. Duque 3
  1. 1 Universidad Nacional de Colombia
    info

    Universidad Nacional de Colombia

    Bogotá, Colombia

    ROR https://ror.org/059yx9a68

  2. 2 Universitat de Barcelona
    info

    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

  3. 3 Universidad EAFIT, Medellín, Colombia
  4. 4 Swiss Federal Institute of Technology in Zurich
    info

    Swiss Federal Institute of Technology in Zurich

    Zúrich, Suiza

    ROR https://ror.org/05a28rw58

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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2021

Issue Title: X Congreso Geológico de España

Issue: 18

Pages: 1059

Type: Article

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More publications in: Geotemas (Madrid)

Abstract

In northwestern Colombia, Planeta Rica locality, in the core of the San Jacinto Fold Belt, there are outcrops of oceanic palaeolithosphere, where the mantle-crust transition zone (MTZ) is preserved. This MTZ is composed of serpentinites, ser- pentinized lherzolites, plagioclase-impregnated peridotites and chromitites (Planeta Rica Peridotites) and gabbros, horn- blende gabbros and clinopyroxenites (Porvenir Gabbro). Mineral chemistry and whole-rock geochemistry data point to a supra-subduction zone (SSZ) environment and U-Pb zircon dating of the Porvenir Gabbro indicate a Late Jurassic age of crystallization (149.7 ± 1.2 Ma, n = 31). Due to the scarce record of Jurassic oceanic rocks in Colombia, the mantle-crust transition zone (MTZ) found in Planeta Rica is a unique example for understanding the fragmentation of western Pangaea during Jurassic times and the early evolution of the Caribbean.

Data source: Dialnet