Un yacimiento de Au en carbonatos del Orógeno Hercínico: el área de Salamón (N León).

• A. Paniagua ^[1] ; L. S. Rodríguez Pevida ^[3] ; J. Loredo ^[1] ; L. Fontboté ^[2] ; P. Fenoll Hach-Alí ^[4]
  1. [1] Universidad de Oviedo

     Universidad de Oviedo

     Oviedo, España

     
  2. [2] Université de Genève

     Université de Genève

     Genève, Suiza

     
  3. [3] Río Narcea Gold Mines, S. A. E- Salas (Asturias).
  4. [4] IACT-Depto. de Mineralogía-Petrología. Universidad de Granada. E-18002 Granada.

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• Localización: Geogaceta, ISSN 0213-683X, Nº. 20, 7, 1996, págs. 1605-1608
• Idioma: español
• Títulos paralelos:
  • A carbonate-hosted Au deposit of the Hercynian belt: the Salamon district (N Leon).
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• Resumen

  • The Salamon gold prospect constitutes an example of carbonate-hosted gold deposit formed during the last events of the Hercynian orogeny. lt is formed by a complex paragenetic sequence of Au-As-Sb-Hg-Cu-Ni-Co-Pb-Zn-U minerals in jasperoid and quartz-dolomite host rock. Au correlated positively with As at single crystal scale in pyrite and arsenopyrite, of fluid inclusion study and arsenopyrite geothermometry show temperatures in the range 140-280ºC at 350-400 bars. Stable isotope data suggest reduction of sulfur from marine evaporites and buffer of carbon in the fluid by the host carbonates. The age of the deposit is 269 ± 5 m. y., U-Pb determination on uranite grains gires and which is consistent with on uranite age from Villamarin and with age determinations of intrusive rocks spatially associated to several ore deposits in the area.