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Geochemical characterization of black shales in the Middle Ordovician-Silurian formations of the Truchas synclinei

dc.contributor.authorUgidos, José María
dc.contributor.authorBarba, Pedro
dc.contributor.authorLombardero, M.
dc.description.abstractThe contents of TÍO,, Al2Oy P20., Rb, rare earth elements and Zr and some element ratios such as Al2OJ TiOy Rb/Zr and Ti/Nb in black shales can be combined to discriminate among different Middle and Upper Ordovician formations in the La Cabrera region. Thus, the Casaio Fm. (lowermost Upper Ordovician) shows sharp chemical differences with the over -and -underlying formations. The Silurian black shales have negative cerium anomalies (Ce/Ce* = 0,82-0,92) probably related to the Silurian transgression. The lower Silurian beds also show variable and high contents (ppm) of Ba (636-3413), U (15-16), Mo (25-110), V (319-3147), Co (34-294) and Ni (54-197) with respect to all other black shalesen_US
dc.publisherSociedad Geológica de Españaen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherLa Cabreraen_US
dc.subject.otherNW Spainen_US
dc.titleCaracterización geoquímica de las pizarras negras de las formaciones del Ordovícico Medio-Silúrico dei sinclinal de Truchasen_US
dc.titleGeochemical characterization of black shales in the Middle Ordovician-Silurian formations of the Truchas synclineieng

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