Área Nuevo Oro, evidencias de un ambiente Hot Spring vinculado a depósitos epitermales en el sector centro-norte del Macizo del Deseado, Santa Cruz, Argentina

RUIZ, R.; GUIDO, D.; PAEZ, G.; JOVIC, S.; MONGAN, M.; BRIVIDORO, P.

Río Cuarto

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

AMA

The Nuevo Oro District is located in the north-central part of Deseado Massif, in Santa Cruzprovince, Argentina. The geology is characterized by a middle to upper Jurassic volcaniclasticcomplex, composed by acidic volcaniclastic rocks with intermediate lavas associated, which hosted two mineralization structures with Au anomalies and several manifestations of Hot Springenvironment represented by siliceous and calcareous deposits associated with fluvio-lacustrinesediments. The development of NW-SE quartz veinlets with vein-breccia textures, the progressively increase in Au contents and a change in outcrop pattern from veins to floats from thenorthwest to the southeast, added to the spatial and the probably genetically relationship with theextended levels of hot spring deposits, suggests a shallow level of exposures within the epithermalenvironment. The association between Hot Spring environments with fluvio-lacustrine sedimentsand the epithermal deposits in the Deseado Massif province confirms the importance that thesemanifestations possess as valuable predictive tools in mining exploration.