[논문]Genesis and applications of the Cerro Rubio kaolin deposit, Patagonia (Argentina)

Cravero, Fernanda; Domı́; nguez, Eduardo; Iglesias, Claudio

doi:10.1016/s0169-1317(00)00021-1

[해외논문] Genesis and applications of the Cerro Rubio kaolin deposit, Patagonia (Argentina)

Applied clay science, v.18 no.3/4, 2001년, pp.157 - 172

Cravero, Fernanda (Departamento de Geologı́) , Domı́nguez, Eduardo (a, Universidad Nacional del Sur, CONICET, San Juan 670, 8000, Pcia. Buenos A, Bahı́) , Iglesias, Claudio (a Blanca, Argentina)

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AbstractAt Cerro Rubio area, the stratigraphic position and the origin of kaolinization have been a matter of controversy. Most of the residual kaolin deposits of Patagonia, Argentina are related to a paleoweathered surface developed over the rhyolitic Bahia Laura Group during the Upper Jurassic–Lower Cretaceous. In the nearby areas and in the same type of rocks, there are Au–Ag epithermal deposits that show argillic alteration, therefore determining the origin of the alteration (weathering or hydrothermal) is essential in exploring new areas for either gold or kaolin. The source rocks are tilted tuffs where the ash-shards and biotites were transformed to kaolinite. A positive cerium anomaly as well as the high δ18O isotopic composition of the kaolinite of 23–24‰ suggest that the kaolinite was formed under weathering conditions. Field and fossil evidence indicate that the source rocks were Middle Jurassic in age. All these evidences suggest that the Cerro Rubio is part of the Paleoweathered surface of Patagonia where almost all the kaolin deposits of Argentina occur.Preliminary studies indicate that, because of its high crude brightness of 79.8, Cerro Rubio kaolin can be used in the manufacture PVC and white paints. In mixtures with other kaolins of the area of less viscosity, it could be used in dinnerware and sanitaryware ceramic, thus increasing the kaolin reserves in Patagonia. Its high viscosity and abrasiveness limited its use without an industrial treatment mainly in the paper industry.

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