Abstract

LEAL, Pablo Rodrigo  and  MATEO, Paula. Paragénesis y microtermometría de las manifestaciones de baritina del anticlinal Chorriaca, provincia del Neuquén. Rev. Asoc. Geol. Argent. [online]. 2015, vol.72, n.2, pp.195-209. ISSN 0004-4822.

In this contribution, the barium sulfate mineralization from Chorriaca anticline was studied. All mines are hosted in carbonate layers (Agua de la Mula stratigraphical unit, Agrio Formation) that evidence a strong lithological control. The assemblages is mainly composed of barite, calcite and iron oxides. Their textures imply three mineralization events, from which the last one was the most important. Fluid inclusion studies on barite crystallized during this last event were carried out. The most representative primary fluid inclusions are composed of water with dissolved salts. Few of them also present hydrocarbons on the liquid phases. Microthermometry evidenced homogeneization temperatures above 300°C and solutions with low salinities. Regarding the reasons stated above we propose that this barite mineralization was generated by hydrothermal processes related to the magmatic activity of Neuquén basin.

Keywords : Barite; Fluid inclusions; Chorriaca; Neuquén.

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