Use of pore volumometry to study the interaction between deformation and metamorphism in experimental dehydration of serpentinites and gypsum

espanolThe effects on mechanical properties of rocks as a consequence of the progress of mineral reactions are particularly accessible and relatively easy to monitor in laboratory experimentation in the case of dehydration reactions because of the bulk volume changes involved as well as in the solid fraction. Hydrated minerals are primary rock-forming phases in fault rocks or in rocks associated with large structures, both in oceanic and in continental crusts and, for that reason, they exert a major control on their evolution. Hence the interest in their study. In this contribution we review the main features of the experimental technique that we use, pore volumometry, the type of data that can be obtained at moderate pressures and temperatures (200 MPa, 700 oC ), and outline some of the processes studied to date. EnglishLos efectos en las propiedades mecanicas de rocas producidos por el desarrollo y el avance de las reacciones minerales son particularmente reproducibles y monitorizables en el laboratorio en el caso de reacciones de deshidratacion debido fundamentalmente a los cambios sustanciales de volumen que se producen en las muestras, de manera global y afectando a la fraccion solida. Los minerales hidratados son fases minerales mayoritarias en rocas de falla o asociadas a grandes estructuras en la corteza tanto continental como oceanica y ejercen un control sobre la evolucion de las mismas, de ahi el interes en su estudio experimental. En esta contribucion revisamos los aspectos mas interesantes de la tecnica experimental, volumometria de poro, el tipo de datos que se pueden obtener a presiones y temperaturas intermedias (