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.
Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 1996

Issue: 20

Pages: 1542-1545

Type: Article

DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Geogaceta

Abstract

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.

Data source: Dialnet