Resumen de El origen de los fluidos hidrotermales en el Skarn férrico de Colmenar-Santa Bárbara (Zona de Ossa Morena).

S. Cuervo, Fernando Tornos Arroyo, B. Spiro, César Casquet Martín

• Oxygen and carbon isotopes of the hydrothermal minerals in the Colmenar-Santa Bárbara skarn suggest that fluids of the main hydrothermal stage (grandite/clinopyroxene and actinolite+magnetite) are of likely magmatic origin. There is only a minor input of modified surficial fluids during the late hydrothermal stages.8 345 values of sulphides indicate that sulphur derives from the hosting volcanosedimentary pile, the likely origin of most of the iron in the skarn. During hydrothermal circulation, magmatic fluids were able to recrystallizate and reconcentrate the magnetite and sulphides in the host rock, but without changing their majar geochemical signatures.