Un modelo de depósito vulcanogénico de manganeso del arco volcánico Paleógeno de Cuba: el ejemplo de la región Cristo-Ponupo-Los Chivos

X. CAZAÑAS, Joan-Carles MELGAREJO, P. ALFONSO, A. ESCUSA, S. CUBA

Abstract


The La Margarita and Los Chivos manganese deposits are representative of the manganese vulcanogenic mineralizations in Cuba. The tridimensional geometry of the deposits has been synthesized from drilling and outcrop data and consists in a complete deposit of: a) a green hydrothermal alteration celadonite zone at the bottom, which has been interpreted as a hydrothermal alteration zone; b) an important jasper level, which has been interpreted as a precipitation product of silica in a submarine floor, c) a stratiform body of massive ore formed by todorokite (“rich ore”) cross-cut by veins of Mn 4 + rich oxides, being todorokite interpreted as a precipitation product of manganese ore in a submarine floor in a period of no pyroclastic contribution to the basin; d) a zone with todorokite mineralization as cement of pyroclasts, or as thin levels with fossils of epifaunic organisms, which have been interpreted as a result of the interaction between pyroclastic deposition cycles with hydrothermal fluid venting, and e) upper hematitic alteration zone. The study of fluid inclusions and mineral associations in the altered zones led us to conclude these were low salinity, medium temperature (230-300ºC), CaCl2 -rich fluids.

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