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D, O and C isotopes in podiform chromitites as fluid tracers for hydrothermal alteration processes of the Mayarí — Baracoa Ophiolitic Belt, eastern Cuba.

AutorProenza, J. A.; Alfonso, P.; Melgarejo, J. C.; Gervilla, Fernando; Tritlla, J.; Fallick, A.E.
Palabras claveCuba
Stable isotopes
Fecha de publicaciónmay-2003
CitaciónJournal of Geochemical Exploration 78-79: 117-122 (2003)
ResumenThe 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).
Descripción6 pages, 2 figures.
Versión del editorhttp://dx.doi.org/10.1016/S0375-6742(03)00021-9
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