RT Journal Article T1 Estimación de las condiciones del metamorfismo hercínico de alta presión de la Sierra de Guadarrama T1 Estimation of the hercynian high-pressure metamorphic conditions in the Sierra de Guadarrama (Spain) A1 Villaseca, Carlos A1 Barbero, Luis AB A revision of the P-T conditions of the first metamorphic episode, based on new data on the mineral chemistry of the residual high pressure paragenesis of the metabasic and metapelitic rocks from the Sierra de Guadarrama, has been made. The results show that this conditions were previously clearly underestimated, and that the minimun pressure achieved is around 9 kb, probably reaching up to 12-15 kb, for temperatures in the range 650-750°C PB Sociedad Geológica de España YR 1994 FD 1994 LK http://hdl.handle.net/10272/13939 UL http://hdl.handle.net/10272/13939 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 13 jun 2026