Piemontitas de las litologías ricas en Mn del macizo de Aracena (Macizo Ibérico Meridional, SW de España)
- Jiménez Millán, J.
- Velilla, N.
ISSN: 0210-6558
Any de publicació: 1992
Volum: 15
Número: 1
Pàgines: 152-156
Tipus: Article
Altres publicacions en: Boletín de la Sociedad Española de Mineralogía
Resum
Piemontites from the Aracena belt (Iberian Massif, SW Spain) appear in silicate rocks (RS) and carbonate rocks (RC) There are chemical differences among piemontites from, these lithologies, Fe/Ca ratio is ordered as follows: RS RC and Mn3+content varies in the opposite sense. These differences are due to the effect of fO2, Xco2, bulk composition, fluids composition and mineral assemb lage. Temperature conditions has been estimated at 400-485ºC. Fe3+ content in piemontite composition indicates higher fO2 in RS than in RC.