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Pyrophanite and braunite in thè Mn-rocks from thè Ossa-Morena Central Belt

dc.contributor.authorJiménez Millán, Juan
dc.contributor.authorVelilla, N.
dc.description.abstractIn the Oliva de la Frontera area (Ossa-Morena Central Belt, Iberian 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 piemontlte 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 Fe-content in braunite of piroxmangite metatuffs can be related to low f02 conditionsen_US
dc.publisherSociedad Geológica de Españaen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherTitanian brauniteen_US
dc.subject.otherOxygen fugacityen_US
dc.titlePirofanita y Braunita titànica en las rocas con Mn del Sector Central de Ossa-Morenaen_US
dc.titlePyrophanite and braunite in thè Mn-rocks from thè Ossa-Morena Central Belteng

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