Metasomatismo de Fe-Ti-Zr causado por infiltración de fundidos diferenciados tipo MORB en el manto ofiolítico de Cuba oriental

  1. N. Pujol-Solà 1
  2. J.A. Proenza 1
  3. A. Garcia-Casco 2
  4. J.M. González-Jiménez 2
  5. M.J. Román-Alpiste 3
  6. C.J. Garrido 3
  7. J.C. Melgarejo 1
  8. F. Gervilla 2
  9. X. Llovet 1
  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 Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR)
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Zeitschrift:
Geotemas (Madrid)

ISSN: 1576-5172

Datum der Publikation: 2021

Titel der Ausgabe: X Congreso Geológico de España

Nummer: 18

Seiten: 1058

Art: Artikel

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Andere Publikationen in: Geotemas (Madrid)

Zusammenfassung

The Moho Transition Zone (MTZ) in the Moa-Baracoa Ophiolitic Massif (Eastern Cuba) hosts numerous gabbroic bodies crosscutting chromitite bodies and the associated peridotites. In the Potosí deposit there is evidence of HFSE-bearing minerals in the interaction zone between pegmatitic gabbro intrusions and the pre-existing chromitite bodies. These minerals are: Ti-rich amphibole, Mg-rich ilmenite hosting Zr oxide inclusions such as baddeleyite, srilankite, and zirconolite, and zircon coronas surrounding the ilmenite grains. In addition to the HFSE-minerals, the minerals forming the interaction zone are Fe3+ - and Ti-rich recrystallized chromite, olivine, clinopyroxene, plagioclase, orthopyroxene, F-rich apatite, and Fe-Ni sulfides. We propose that the mineral assemblage observed in Potosí formed after: (1) crystallization of and evolved MORB (BAB- B)-like melt producing residual water-rich melts enriched in HFSE, and (2) reaction of the residual melts with the surroun- ding chromitites in a closed system triggering the Fe-Ti-Zr modal metasomatism. Dating of baddeleyite crystals (134.4 ± 14 Ma) indicate that the age of the metasomatic event matches (within uncertainty) the formation age form the oceanic crust of the eastern Cuba ophiolite.

Fuente de los datos: Dialnet