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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/32085

Title: Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba
Authors: Blanco-Quintero, Idael Francisco
Proenza Fernández, Joaquín Antonio
García-Casco, Antonio
Tauler, Esperança
Galí Medina, Salvador
Issue Date: 2011
Abstract: A variety of metaultramafic (serpentinite) rocks in La Corea mélange, Sierra de Cristal, eastern Cuba, show differences in chemical, textural and mineralogical characteristics demonstrating a variety of protoliths. The mélange originated during the Cretaceous as part of the subduction channel associated with the Caribbean island arc. This mélange contains high pressure blocks in a serpentinite matrix and occurs at the base of the large tabular Mayarí-Cristal ophiolite. Two principal groups of serpentinites have been identified in the mélange: a) antigorite serpentinite, mainly composed of antigorite and b) antigorite-lizardite serpentinite, composed of mixtures of antigorite and lizardite and bearing distinctive porphyroblasts of diopsidic clinopyroxene. Antigorite serpentinites are closely related to tectonic blocks of amphibolite (representing subducted MORB) and constitute deep fragments of the serpentinitic subduction channel formed during hydration of the mantle wedge. The composition of the antigorite-lizardite serpentinites and the presence of clinopyroxene porphyroblasts in this type of rock suggest that abyssal lherzolite protoliths transformed into serpentinite before and during incorporation (as tectonic blocks) in the shallow part of the subduction channel. Although the studied rocks have different origin, mineralogical compositions and textures, they display similar PGE compositions, suggesting that these elements experienced no significant redistribution during metamorphism. Both types of serpentinites were exposed together in the La Corea mélange during the Late Cretaceous, during obduction of the overriding Mayarí-Baracoa ophiolitic belt that led to exhumation of the subduction channel (mélange).
Sponsorship: Financial support from Spanish MEC projects CGL2006-07384, CGL2006-08527, CGL2009- 12446, CGL2009-10924 and 2009-SGR444 from the Catalan Government. This is a contribution to IGCP-546 “Subduction zones of the Caribbean”. Blanco-Quintero is supported by grant AP2005-5258 from the ‘‘Programa de Formación del Profesorado Universitario’’ of the Spanish Ministry of Education and Science.
Publisher: Universidad de Barcelona; Instituto de Ciencias de la Tierra Jaume Almera
Keywords: Serpentinite
Subduction channel
La Corea Mélange
URI: http://hdl.handle.net/10481/32085
ISSN: 1695-6133
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Blanco-Quintero, I.F.; et al. Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba. Geologica Acta, 9(3-4): 389-405 (2011). [http://hdl.handle.net/10481/32085]
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