@article{10272/16350,
year = {1992},
url = {http://hdl.handle.net/10272/16350},
abstract = {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},
publisher = {Sociedad Geológica de España},
title = {Litologías manganesíferas del área central de Ossa-Morena (SW de Badajoz)},
title = {Manganese lithologies of the central area of Ossa-Morena},
author = {Jiménez Millán, Juan and Ruiz de Almodóvar Sel, Gabriel and Velilla, N.},
}