Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/19077
Share/Impact:
Título : D, O and C isotopes in podiform chromitites as fluid tracers for hydrothermal alteration processes of the Mayarí — Baracoa Ophiolitic Belt, eastern Cuba.
Autor : Proenza, J. A., Alfonso, P., Melgarejo, J. C., Gervilla, Fernando, Tritlla, J., Fallick, A.E.
Palabras clave : Cuba
Fluids
Serpentinization
Stable isotopes
Ophiolites
Fecha de publicación : May-2003
Editor: Elsevier
Citación : Journal of Geochemical Exploration 78-79: 117-122 (2003)
Resumen: The Mayarí — Baracoa Ophiolitic Belt (MBOB, eastern Cuba) is composed of two large, chromite-rich massifs: Mayarí —Cristaland Moa-Baracoa. The chromitites and hosting dunites were firstly affected by a regional serpentinization event, a subsequent episode of hydrothennal alteration (chloritization mainly) and, finally, these already altered bodies were crosscut by thin calcite-dominated veins. Analysed serpentines from serpentinized chromitites and dunites present very similar isotopic compositions (δ18O=+4.7 to +6.3 and δD= −67 to −60 , suggesting that the serpentinization process took place at moderate temperatures, in an oceanic environment. Serpentine formation by interaction with ocean water is also supported by the isotopic composition of chlorite and calcite. These results suggest that the serpentinization, chloritization and fracture filling processes of the Mayarí — Baracoa Ophiolite Belt took place in a subocean floor scenario and, thus, that the Mayarí — Baracoa serpentines represent a good example of serpentine formed during interaction with seawater. The oceanic origin of the serpentines from serpentinized chromitites and dunites from the MBOB indicate that the serpentinization of the mantle sequence occurred pre-thrusting (pre-emplacement in age).
Descripción : 6 pages, 2 figures.
Versión del editor: http://dx.doi.org/10.1016/S0375-6742(03)00021-9
URI : http://hdl.handle.net/10261/19077
DOI: 10.1016/S0375-6742(03)00021-9
Citación : Journal of Geochemical Exploration 78-79: 117-122 (2003)
Appears in Collections:(IACT) Artículos

Files in This Item:
There are no files associated with this item.
Show full item record
 
CSIC SFX LinksSFX Query


Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.