Las cromititas del Complejo Ofiolítico de Camagüey, Cuba

un ejemplo de cromitas ricas en Al

Saturnina Henares*, José María González-Jiménez, Fernando Gervilla, Joaquín A. Proenza, Alfonso Chang Rodríguez, Rubén B. González-Pontón

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The Camagüey Ophiolitic Complex extends along the central-eastern region of Cuba. This ophiolitic complex contains several deposits of Al-rich chromite [Cr/(Cr+Al) = 0.31-0.6] very enriched in TiO2 (up to 1 wt%) and represents the second most important mining district for refractory grade chromite in Cuba. The chromite deposits are hosted by dunite and harzburgite, spatially associated with feldspatic rocks (gabbro dikes and/or sills, troctolites and/or anorthosites) in close proximity to gabbroic cumulates at the base of the plutonic crust. The texture observed in the chromite deposits is predominantly massive, although fine disseminated, nodular and brecciated textures are also present. The interstitial silicate matrix of the chromitite consists principally of olivine and to a lesser extent pyroxenes and plagioclase. Often these silicates are altered to other secondary minerals such as serpentine, chlorite, magnetite and uvarovite-type garnet. The chromite crystals usually host small solid inclusions of the same silicates that form the matrix, Fe-, Ti-and/or Zr-rich oxides, and Fe-Ni-Cu sulphides and alloys. The above mentioned metallic minerals also occur in the interstitial silicate matrix where they record variable alteration. The structural, petrological and geochemical characteristics of the chromitites suggest formation from melts generated after reaction of basaltic melts with upper lithospheric mantle peridotites or, alternatively, as result of the assimilation of pre-existing feldspatic rocks (gabbros and troctolites) located in the shallowest upper mantle.

Original languageSpanish
Pages (from-to)173-185
Number of pages13
JournalBoletin de la Sociedad Geologica Mexicana
Volume62
Issue number1
Publication statusPublished - 2010

Cite this

Henares, S., González-Jiménez, J. M., Gervilla, F., Proenza, J. A., Rodríguez, A. C., & González-Pontón, R. B. (2010). Las cromititas del Complejo Ofiolítico de Camagüey, Cuba: un ejemplo de cromitas ricas en Al. Boletin de la Sociedad Geologica Mexicana, 62(1), 173-185.