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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/35939

Title: From deep to shallow fluid reservoirs: evolution of fluid sources during exhumation of the Sierra Almagrera, Betic Cordillera, Spain
Authors: Dyja, Vanessa
Hibsch, Christian
Tarantola, Alexandre
Cathelineau, Michel
Boiron, Marie-Christine
Marignac, Christian
Bartier, Danièle
Carrillo-Rosúa, Javier
Morales-Ruano, Salvador
Boulvais, Philippe
Issue Date: 2015
Abstract: Palaeo-fluids trapped in quartz and siderite-barite veins hosted by graphitic schists recorded the fluid and metal transfers during the Neogene exhumation of the Sierra Almagrera Metamorphic Core Complex. First quartz veins registered the ductile then brittle-ductile extensional shearing. The reservoir at that time was wetted by high-salinity fluids with a low density volatile phase resulting from the dissolved Triassic evaporites. Low salinity fluids occurred during the exhumation within the brittle domain as revealed by transgranular fluid inclusion planes affecting previous veins. This suggests an opening of the system and the penetration of surficial fluids from uplifted ranges during Serravalian to early Tortonian times. Transcurrent tectonics generated marine basins since late Tortonian. At depth quartz veins discordant to the foliation were associated to hematite indicating oxydizing conditions. A stop of the low-saline record is revealed by high-salinity Fe-rich fluids issued from the underlying metamorphic reservoir. The Messinian ongoing activity of the sinistral Trans-Alboran tectono-volcanic trend led to the formation of ore deposits. Reducing conditions and Fe-rich fluid led to the formation of siderite and pyrite. The subsequent formation of galena and barite under oxydizing conditions has been related to a probable increase of temperature. A higher salinity and the Cl/Br ratio indicate another source of secondary brine issued from dissolved Messinian evaporites as confirmed by δ34S signature of barite. Transcurrent tectonics clearly modified the hydrogeology of the upper reservoir. The faulting connected the deeper and upper reservoir generally separated by the brittle/ductile transition rheological and hydrogeological barrier under extensional tectonic regimes as confirmed by the stage of low-saline fluids.
Sponsorship: Université de Lorraine, GeoRessources, CNRS, CREGU
Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR)
Universidad de Granada. Departamento de Didáctica de las Ciencias Experimentales
Universidad de Granada. Departamento de Mineralogía y Petrología
Université de Rennes 1, Géosciences Rennes - UMR CNRS
This work was supported by the Ministry of Higher Education and Research (MESR, France) and the CNRS ST-INSU-CT5 programme.
Publisher: John Wiley & Sons Ltd
Description: Esta es una versión PREPRINT. El artículo final está publicado por GEOFLUIDS y se encuentra disponible en: http://onlinelibrary.wiley.com/doi/10.1111/gfl.12139/abstract
This is a PREPRINT version (pre-refereeing) of the paper: Dyja, V., Hibsch, C., Tarantola, A., Cathelineau M., Boiron M.C., Marignac C, Bartier, D., Carrillo-Rosúa, J., Morales-Ruano, S., Boulvais, P. (2015). From deep to shallow fluid reservoirs: evolution of fluid sources during exhumation of the Sierra Almagrera, Betics, Spain. Geofluids, doi: 10.1111/gfl.12139.
Keywords: Fluid inclusions
Inclusiones fluidas
Betic Cordillera
Cordillera Bética
Metamorphic Core Complex
Stable isotopes
Metamorphic brines
Fluidos metamórficos
Evaporites
Evaporitas
Volcanism
Vulcanismo
URI: http://hdl.handle.net/10481/35939
ISSN: 1468-8123
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Dyja, V.; Hibsch, C.; Tarantola, A.; Cathelineau, M.; Boiron, M.C.; Marignac, C.; Bartier, D.; Carrillo-Rosúa, J.; Morales-Ruano, S.; Boulvais, P. From deep to shallow fluid reservoirs: evolution of fluid sources during exhumation of the Sierra Almagrera, Betics, Spain. Geofluids, 16(3): on-line (2015). [http://hdl.handle.net/10481/35939]
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