Litologías manganesíferas del área central de Ossa-Morena (SW de Badajoz)

• Autores: Juan Jiménez Millán, Gabriel Ruiz de Almodóvar Sel, N. Velilla
• Localización: Geogaceta, ISSN 0213-683X, Nº. 12, 1992, págs. 46-49
• Idioma: español
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• Resumen

  • Mangenese lithologies from Oliva de la Frontera area occur in the Cumbres-Hinojales unit (Ossa-Morena South-Central Belt) within a Lower Ordovician age volcanosedimentary sequence. Petrographic study allows to differentiate six Mn-Fe lithologies: Mn-crystal tuffs, Mn-shales, cotfcules, Mn-pyroxenoid rich rocks, braunite layers and hematite layers. Al/(Al+Fe-f-Mn) and Na/(Na+K) discriminating ratios support the above classification. Geologic, mineral, textural and geochemical data provide dues about the mixture process among volcanic, terrigene and chemical materials that originated the protolliths o f the metamorphic manganese lithologies