Mineralogy, geochemistry and petrogenesis of a new jade deposit, Sierra del Convento Mélange, E. Cuba
The Sierra del Convento mélange (Eastern Cuba) represents a well preserved fragment of the Cretaceous oceanic subduction channel in the Caribbean realm, developed by the subduction of the Protocaribbean basin below the Caribbean Plate. The mélange is formed by a serpentinite matrix, which contains a...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/206771 |
| Acceso en línea: | http://hdl.handle.net/10261/206771 |
| Access Level: | acceso abierto |
| Palabra clave: | Mineralogía Mélange Sierra del Convento (Cuba) |
| Sumario: | The Sierra del Convento mélange (Eastern Cuba) represents a well preserved fragment of the Cretaceous oceanic subduction channel in the Caribbean realm, developed by the subduction of the Protocaribbean basin below the Caribbean Plate. The mélange is formed by a serpentinite matrix, which contains a variety of tectonic blocks metamorphosed to high pressure and low to high temperature, including blueschists, pelitic gneisses, anatectic tonalitic–trondhjemitic rocks, epidote-garnet plagioclase-lacking amphibolites and sepertinites. This mélange has unique characteristics by showing evidence of partial melting of the slab developed by subduction of very young oceanic plate. Recently, in situ jadeitite blocks have been discovered in the Sierra del Convento mélange surrounded by sheared serpentinitic rocks. The combination of hot subduction and occurrence of jadeitite generates an exceptional scenario to decipher the interaction at intermediate to high-temperature of fluids in the subduction channel and its boundary with the mantle wedge. This PhD thesis is focused on the study of jadeitite and related rocks with emphasis in their petrogenesis by fluid-rock interaction in a subductive context. In addition, the serpentinitic rocks associated with jadeitites have been included in the study in order to decipher the context of formation of jadeitites. Serpentinite rocks preserve fertile protolith signatures |
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