Metasomatismo de Fe-Ti-Zr causado por infiltración de fundidos diferenciados tipo MORB en el manto ofiolítico de Cuba oriental
- N. Pujol-Solà 1
- J.A. Proenza 1
- A. Garcia-Casco 2
- J.M. González-Jiménez 2
- M.J. Román-Alpiste 3
- C.J. Garrido 3
- J.C. Melgarejo 1
- F. Gervilla 2
- X. Llovet 1
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1
Universitat de Barcelona
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2
Universidad de Granada
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- 3 Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR)
ISSN: 1576-5172
Año de publicación: 2021
Título del ejemplar: X Congreso Geológico de España
Número: 18
Páginas: 1058
Tipo: Artículo
Otras publicaciones en: Geotemas (Madrid)
Resumen
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.