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Le gisement Oro del Sur est situé au Sud de la Precordillera, Province de Mendoza, Argentine (32°30'S et 69°05'W) dans le segment de subduction nommé flat-slab. Il s'agit d'un gisement de type porphyre au Cu (Mo) associé aux veines épithermales (or) et génétiquement liés aux roches volcaniques du Miocène qui exhibent caractéristiques géochimiques (spécialement forts appauvrissements en Y et Yb et rapports Sr/Y et La/Yb exceptionnellement élevés) qui dénotent une tendance de type adakitique, pendant que leurs compositions isotopiques Sr-Nd proposent une participation du manteau dans sa genèse. L'âge du magmatisme adakitique (∼19 Ma) suggère la modification de la signature géochimique du magmatisme lié au début de l'horizontalisation de la zone de subduction. La signature de type adakitique du volcanisme miocène au gisement Oro del Sur met en évidence une liaison privilégié entre le magmatisme adakitique, la minéralisation et l'horizontalisation de la plaque dans cette région andine.

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Abstract:

The Oro del Sur deposit is located in the southern part of the Precordillera of Mendoza Province, Argentina (32°30'S, 69°05'W) within the flat-slab subduction segment. It is a Cu-(Mo) porphyry type system with associated high sulfidation Au-(Cu) epithermal veins genetically linked to Miocene volcanic rocks which show geochemical characteristics (particularly low Y and low Yb values and high Sr/Y and La/Yb ratios) that indicate an adakite-like signature, and a Sr-Nd isotopic composition that suggests involvement of a depleted mantle source in their genesis. The age of this adakitic magmatism (∼19 Ma) suggests a change in the geochemical signature of the magmatism linked to the onset of flattening of the subduction zone. The adakite-like signature of the Miocene volcanism of the Oro del Sur ore deposit supports a genetic relationship between adakitic magmatism, mineralization and slab shallowing in this part of the Andes.

Keywords: ADAKITE-LIKE SIGNATURE; ARGENTINA; EPITHERMAL; HIGH SULFIDATION; MIOCENE MAGMATISM; ORO DEL SUR DEPOSIT; PRECORDILLERA

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2011/0172

Publication date: September 1, 2011

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