Pirofanita y Braunita titánica en las rocas con Mn del Sector Central de Ossa-Morena.

  1. J. Jiménez Millán 1
  2. N. Velilla 2
  1. 1 Departamento de Geología.Universidad de Jaén.
  2. 2 Departamento de Mineralogía y Petrología. Universidad de Granada.
Revista:
Geogaceta

ISSN: 0213-683X

Any de publicació: 1996

Número: 20

Pàgines: 1542-1545

Tipus: Article

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Altres publicacions en: Geogaceta

Resum

In the Oliva de la Frontera area (Ossa-Morena Central Belt, lberian Massif, SW Spain) titanian braunite occurs in manganiferous metashales and manganiferous metatuffs while pyrophanite is restricted to pyroxmangite metatuffs. During hercynian metamorphism primary Mn4+ was reduced to Mn3+ and Mn2+ to form piemontite in shales and metatuffs, and more extensively in piroxmangite metatuffs to form pyrophanite. Ti and Al-enrichment in braunite depend on the whole composition while high Fecontent in braunite of piroxmangite metatuffs can be related to low fO2 conditions.

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