MINERALOGIA DEL SKARN DE HIERRO DEL CERRO PANTA(36º 58´31”S – 70º, 37´45”W). CORDILLERA DEL VIENTO. PROVINCIA del NEUQUÉN

ANA MARÍA CASÉ; JUAN CARLOS DANIELI; GRACIELA MAS; MARTA FRANCHINI

Río Cuarto

Congreso; 10º Congreso de Mineralogía y Metalogenia 2010; 2010

Asociación Mineralógica Argentina y Universidad Nacional de Río Cuarto

The skarn is located in the Cordillera del Viento region of NW Neuquén, underlying hydrothermalbreccias located in the cupola of the stock Tonalita Butalón Formation. The skarn consists of an innergarnet (Ad84-99 Gr0-12 Py1-4 Ad76-46 Gr20-50 Py4) and an outer clinopyroxene (Di51-73 Hd25-44 Jo1-6) zones with magnetite (10-15%) that overprints a metamorphic aureole (biotite hornfels). Thismagnetite-rich skarn originated by the interaction of Permian volcaniclastic rocks of the Choiyoi Group with hydrothermal fluids derived from Pre-Eocene dikes of the Tonalita Butalon Formation. Based on fluid inclusions in garnet, the prograde skarn formed from moderate saline fluids with temperatures between 220º and 320º C (Th L+V).skarn consists of an innergarnet (Ad84-99 Gr0-12 Py1-4 Ad76-46 Gr20-50 Py4) and an outer clinopyroxene (Di51-73 Hd25-44 Jo1-6) zones with magnetite (10-15%) that overprints a metamorphic aureole (biotite hornfels). Thismagnetite-rich skarn originated by the interaction of Permian volcaniclastic rocks of the Choiyoi Group with hydrothermal fluids derived from Pre-Eocene dikes of the Tonalita Butalon Formation. Based on fluid inclusions in garnet, the prograde skarn formed from moderate saline fluids with temperatures between 220º and 320º C (Th L+V).