@misc{10481/78420,
year = {2022},
month = {12},
url = {https://hdl.handle.net/10481/78420},
abstract = {Exotic blocks of massive antigorite-serpentinite (antigoritite) document a deep-seated subduction channel in the Villa Clara serpentinite-matrix m ́elange, central Cuba. The petrological and geochemical characteristics of antigoritite allow distinguishing two types of rock: i) antigoritite and ii) dolomite-bearing antigoritite. Both types are intimately related in field exposures and represent deep peridotite infiltrated by H2O-CO2 fluid mixtures that triggered antigoritization and local carbonation. Fluid infiltration continued after antigoritization forming a vein network as a potential response to hydrofracturing that precipitated tremolitite in the veins and triggered fluid- antigoritite reaction forming blackwalls. The mineralogical and chemical zoning in the blackwalls (Atg + Chl + Tr adjacent to antigoritite and Chl + Tr adjacent to the tremolitite vein) attest for multi-step metasomatic processes during fluid-rock interaction characterized by advection of infiltrating fluid towards the blackwall and, possibly, by diffusion out of the blackwall towards the fluid-filled vein. Tentative thermodynamic modeling of the blackwall domain Atg + Chl + Tr points vein network formation at 400–500 ◦C and 5–10 kbar during exhumation in the subduction channel, suggesting the infiltration of deep-seated pressurized fluid that triggered hydrofracturing. The chemical compositions of antigoritites, veins and blackwalls indicate a LILE- and LREE- enriched fluid evolved from the subducting plate, while Sr–Nd isotope systematics are compatible with an external fluid composed of a mixture of fluids evolved from sediments and, probably to a lesser extent, altered oceanic crust.},
organization = {Grupo RNM-302},
organization = {MICINN PID2019-
105625RB-C21 (co-funded by Fondo Europeo de Desarrollo Regional,
FEDER},
organization = {Junta de Andalucía P20_00550},
organization = {Catalonian project SGR 2014-
1661},
organization = {University of Granada},
organization = {Scholarship of Fundació Universitária Agustí Pedro i Pons},
organization = {Funding for open access charge: Universidad de Granada/CBUA},
organization = {PhD grant BES- 2013-063205 of the Spanish Ministry of Economy and Competitiveness},
publisher = {Elsevier},
keywords = {Antigoritite},
keywords = {Abyssal peridotite},
keywords = {Subduction},
keywords = {Fluid infiltration},
keywords = {Metasomatism},
keywords = {Mélange},
keywords = {Cuba},
keywords = {Caribbean},
title = {Fluid flow in the subduction channel: Tremolite veins and associated blackwalls in antigoritite (Villa Clara serpentinite mélange, Cuba)},
doi = {https://doi.org/10.1016/j.lithos.2022.106973},
author = {Butjosa, Lidia and Cambeses Torres, Aitor and Proenza Fernández, Joaquín Antonio and Blanco-Quintero, Idael Francisco and Angostini, Samuele and Iturralde, Manuel and García Casco, Antonio},
}