Gómez Barreiro, JuanCastiñeiras, PedroMartínez Catalán, José R.Arenas, R.2014-11-192014-11-192002http://hdl.handle.net/10272/9362The Arinteiro massif has a complex structure which includes shear zones, recumbent folds, thrusts and upright folds. Ca-poor amphibolites occur associated with the shear zones, although there is some controversy about the origin of such rocks. Shear zones could act as channel-ways for fluids during deformation, modifying the chemical composition of sheared rocks. Detailed field studies and fabric analysis show a close relationship between the impoverishment in calcium of the Arinteiro massif amphibolites and the ductile shear zones. A model to explain the evolution of Ca-poor amphibolites is proposed in which fluids are channelized by the shear zones, extracting calcium from the normal amphibolites. Moreover, calc-silicate rocks occur far from deformation zones and are considered to be metasomatic products of the interaction between Ca-rich fluids/common amphibolitesspaAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Ca-poor amphibolitesCa-metasomatismOrdenes Complexjournal articleopen access