Contribución de los isótopos de He al origen de los fluidos hidrotermalesaplicación al estudio de las mineralizaciones de fluorita de Asturias (N de España)

  1. Vindel Catena, Elena
  2. Corbella Cordomí, Mercè
  3. Cardellach López, Esteve
  4. Sánchez, V.
  5. Martín-Crespo, V.
Journal:
Estudios geológicos

ISSN: 0367-0449

Year of publication: 2010

Volume: 66

Issue: 1

Pages: 75-82

Type: Article

DOI: 10.3989/EGEOL.40168.111 DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Estudios geológicos

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Abstract

En este trabajo se ha realizado un estudio de isotopos de He con objeto de determinar la influencia mantelica o cortical de los volatiles en los fluidos implicados en la formacion de las mineralizaciones de F-Ba de Asturias (N de Espana). Estas mineralizaciones se presentan como capas, mantos y filones encajados en materiales Permotriasicos y Paleozoicos. La mineralogia esta constituida por fluorita, barita, calcita, cuarzo y sulfuros y los yacimientos encuadran en la tipologia Mississippi Valley (MVT) asociados con eventos hidrotermales de rifting en relacion con la apertura del Oceano Atlantico. Los valores de 3He/4He (. 0,1 Ra) obtenidos en los fluidos de Asturias indican un origen cortical y se excluye cualquier implicacion mantelica. Estos resultados son consistentes con el modelo convencional de formacion de yacimientos de fluorita tipo MVT a partir de la circulacion de fluidos de cuenca altamente salinos, con la ausencia de actividad ignea en la zona contemporanea con la mineralizacion, y con datos de isotopos de He en otros yacimientos similares en Europa.

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