Fluid transfer into the wedge controlled by high-pressure hydrofracturing in the cold top-slab mantle
- Padron-Navarta, J. A.
- TOMMASI, Andrea
- Garrido, Carlos J.
- Lopez Sanchez-Vizcaino, Vicente
- Teresa Gomez-Pugnaire, Maria
- Jabaloy, Antonio
- Vauchez, Alain
DOIAbstract
International audienceBefore attaining the mantle wedge, where they trigger partial melting, volatiles released from dehydration reactions in the slab have to migrate across a relatively cold (<750 degrees C), peridotite-layer above the incoming slab. In order to unravel the mechanisms allowing for this initial stage of fluid transport, we performed a detailed field and microstructural study of metamorphic prograde peridotites in the Cerro del Almirez ultramafic massif (Betic Cordillera, Spain), where evidences of one of the most important dehydration reactions in subduction zones, the high-pressure antigorite breakdown (P = 1.6-1.9 GPa and T approximate to 680 degrees C), can be mapped in the field. This reaction led to arborescent growth ...
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