http://www.cnr.it/ontology/cnr/individuo/prodotto/ID285209

Lithium and boron isotope systematics in lavas from the Azores islands reveal crustal assimilation. (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Lithium and boron isotope systematics in lavas from the Azores islands reveal crustal assimilation. (Articolo in rivista) (literal)

Anno

2014-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.chemgeo.2014.02.024 (literal)

Alternative label

Genske F.S.[1,2], Turner S.P.[1], Beier C.[1,2], Chu M.-F. [1,3], Tonarini S.[4], Pearson N.J.[1], Haase K.M. [2] (2014)
Lithium and boron isotope systematics in lavas from the Azores islands reveal crustal assimilation.
in Chemical geology; Elsevier, New York (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Genske F.S.[1,2], Turner S.P.[1], Beier C.[1,2], Chu M.-F. [1,3], Tonarini S.[4], Pearson N.J.[1], Haase K.M. [2] (literal)

Pagina inizio

27 (literal)

Pagina fine

36 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.journals.elsevier.com/chemical-geology/ (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

373 (literal)

Rivista

Chemical geology (Rivista)

Note

Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

[1] ARC Centre of Excellence for Core to Crust Fluid Systems/GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, Australia. [2] GeoZentrum Nordbayern, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany [3] Institute of Oceanography, National Taiwan University, Taipei, Taiwan [4] Istituto di Geoscienze e Georisorse-CNR, Pisa, Italy (literal)

Titolo

Lithium and boron isotope systematics in lavas from the Azores islands reveal crustal assimilation. (literal)

Abstract

The stable isotope systems of Li and B are useful tools for the understanding of ocean island basalt genesis. We have applied both systems to a comprehensive set of well-characterised samples across the Azores islands in order to further evaluate the nature of the mantle source. These ocean islands represent the surface expression of a low-buoyancy mantle plume. The variability of Li and B concentrations and their isotopic compositions across the archipelago builds on recent radiogenic isotope studies from the islands to the west of the Mid-Atlantic Ridge (Flores and Corvo). The results for both systems yield some values that are typical for ocean island basalts; however, the variability of both ?7Li and ?11B observed in primitive lavas is most extreme on the western islands of Flores and Corvo (?7Li = + 3.5 to + 8.2? and ?11B = - 3.5 to + 11.8?). The large spread in isotopic composition is most likely due to contamination of the magmas during ascent through hydrothermally altered oceanic crust. Models of assimilation fractional crystallisation best explain the variability observed on each island and allow for robust estimates of the mantle source. The implication of these observations is that the interpretation of the radiogenic isotopes and trace elements may have to be treated with care if the stable isotopes record contamination by assimilation of hydrothermally altered material and that the use of Li and B as mantle source tracers may be obscured by shallow level processes. Further, it seems unlikely that the large range observed in Sr and Nd isotopes can reflect variable contributions from recycled low-T materials such as sediment or altered MORB, since there is no correlation between the radiogenic and stable isotope data. (literal)

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