Ultramafic-hosted volcanogenic massive sulfide deposits from Cuban ophiolites
Metadatos
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Elsevier
Materia
Ultramafic-hosted volcanogenic massive sulfide deposits (UM-VMS) Ophiolite Cuba Supra-subduction zone (SSZ) Serpentinization Gold
Fecha
2022-08-23Referencia bibliográfica
Diego Domínguez-Carretero... [et al.]. Ultramafic-hosted volcanogenic massive sulfide deposits from Cuban ophiolites, Journal of South American Earth Sciences, Volume 119, 2022, 103991, ISSN 0895-9811, [https://doi.org/10.1016/j.jsames.2022.103991]
Patrocinador
Spanish Government PI0975; CAP Investigacion PUCP-2022 Program PID 2019- 105625RB-C21; MCIN/AEI PRE 2020-092140 2022-A- 0047Resumen
Ultramafic-hosted volcanogenic massive sulfide deposits (UM-VMS) located in the Havana-Matanzas ophiolite
(Cuba) are the only known example of this type of mineralization in the Caribbean realm. UM-VMS from Havana-
Matanzas are enriched in Cu, Ni, Co, Au, and Ag. The mineralization consists of massive sulfide bodies mostly
composed of pyrrhotite and hosted by serpentinized upper mantle peridotites. Chemical composition of unaltered
cores in Cr-spinel grains found within the massive sulfide mineralization and in the peridotite host indicates
formation in the fore-arc region of the Greater Antilles volcanic arc. A first stage of serpentinization probably
took place prior to the sulfide mineralization event. The UM-VMS mineralization formed by the near-complete
replacement of the silicate assemblage of partially serpentinized peridotites underneath the seafloor. The
sequence of sulfide mineralization has been divided into two stages. The first stage is characterized by a very
reduced hydrothermal mineral assemblage consisting of pyrrhotite, Co–Ni–Fe diarsenides, chalcopyrite, Co-rich
pentlandite, and electrum. In the second stage, pyrite and Co–Ni–Fe sulfarsenides partially replaced pyrrhotite
and diarsenides, respectively, under a more oxidizing regime during the advanced stages of ongoing serpentinization.
The proposed conceptual genetic model presented here can be useful for future exploration targeting
this type of deposit in the Caribbean region and elsewhere.