Diente Verde and Mario, Cañada Honda, San Luis, Argentina:porphyry-type deposits in the South Pampean flat-slab region of the Central Andes

NILDA URBINA; PATRICIA SRUOGA

Niza, Francia

Simposio; 7 th International Symposium on Andean Geodynamics; 2008

The San Luis Tertiary Metallogenic Belt (SLMB) located in the Sierras Pampeanas of San Luis is related with the subduction zone shallowing between 27º and 33º S . Mineralization and volcanic rocks occur within a west-northwest-trending magmatic belt from La Carolina in the west to El Morro in the east . Mesosilicic magmas belong to normal to high-K calc-alkaline and shoshonitic types. In a close spatial and temporal linkage several mineralizations of epithermal and porphyry types are associated. Volcanic activity began at about 12-13 Ma in the west and ended at 1.9 Ma in the east  Volcanics and associated mineralization formed 600-700 kilometers east from the trench for about 10 m.y. and over a west-east distance of 80 kilometers. The Diente Verde and Mario deposits are copper-gold porphyry mineralizations genetically related to the Late Miocene-Late Pliocene volcanic activity. Both deposits are located at Cañada Honda district and are part of an arc-transverse magmatic lineament at 33º S coincidently with the change of the subduction angle.