Consulta: creatorFacets:"Gastaud, Janine"
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Data/hora: 11/06/2024 09:56:52

40 AR/39 AR ages for the alkaline volcanism and the basement of Gorringe Bank, North atlantic Ocean
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Feraud, Gilbert; Gastaud, Janine; Auzende, Jean-marie; Olivet, Jean-louis; Cornen, Guy.
Gorringe Bank is situated on the Europe-Africa plate boundary at the eastern end of the Azores-Gibraltar fracture zone. It has two summits. Gettysburg Bank to the southwest and Ormonde Bank to the northeast. We applied the 40Ar/39AR stepwise heating method to date six samples of the alkaline volcanic rocks. Two gabbros from the Ormonde Bank and a dolerite from the Gettysburg Bank. The results suggest that the alkaline volcanism lasted probably for less than 6 Ma(66-60 Ma). Although the nature of this volcanism precludes any subduction feature during its setting. the alkaline volcanism of Ormonde is probably linked to Upper Cretaceous/Eocene compressive tectonic events.  The basement rocks of Gorringe Bank reveal disturbed 40Ar/39Ar age spectra.  One...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-5365.pdf