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- W1984702998 abstract "The discovery of calpionellids and radiolarians in thin sedimentary layers intercalated in the upper part of MORB tholeiitic pillow basalts allows us to date the oceanic crust of Maio Island (Capo Verde Islands) as early Valanginian instead of, as was hitherto believed Late Jurassic. This new dating fits better with reconstructions of the geological history of the Central Atlantic based on magnetic anomalies. The overlying light-coloured pelagic limestones (Maiolica facies) with radiolarians, aptychi and ammonites are Valanginian-Barremian in age. These limestones are lithologically similar to the white limestones drilled at several DSDP sites in the Central Atlantic. La découverte de calpionelles et de radiolaires, dans plusieurs minces intercalations sédimentaires situées à la partie supérieure des basaltes tholéiitiques en coussins de type MORB, permet de dater la croûte océanique affleurant sur l'île de Maio, archipel du Cap Vert, du Valanginien inférieur et non pas du Jurassique supérieur comme on l'admettait jusqu'ici. Cette nouvelle datation s'accorde avec les reconstitutions proposées de l'Atlantique central basées sur les anomalies magnétiques. Cette étude a également permis d'attribuer au Valanginien-Barrémien les calcaires pélagiques clairs à radiolaires, Aptychus et ammonites de Maio, antérieurement rapportés au Jurassique supérieur-Aptien. Ces calcaires à cherts, de faciès identique à celui de la Maiolica téthysienne, sont comparables aux “White Limestones” rencontrés dans de nombreux forages océaniques de l'Atlantique central." @default.
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- W1984702998 date "1990-10-01" @default.
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- W1984702998 title "Contribution à la datation de la croûte océanique de l'Atlantique central: Age valanginien inférieur des basaltes océaniques et âge néocomien des calcaires Maiolica de Maio (Iles du Cap Vert)" @default.
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- W1984702998 doi "https://doi.org/10.1016/0025-3227(90)90018-f" @default.
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