Idioma:

Nickel and helium evidence for melt above the core-mantle boundary

Herzberg, Claude ; Asimow, Paul D ; Ionov, Dmitri A ; Vidito, Chris ; Jackson, Matthew G ; Geist, Dennis

Nature (London), 2013-01, Vol.493 (7432), p.393-397 [Periódico revisado por pares]

England: Nature Publishing Group

Texto completo disponível

Citações Citado por

Enviar para

Título:
Nickel and helium evidence for melt above the core-mantle boundary
Autor: Herzberg, Claude ; Asimow, Paul D ; Ionov, Dmitri A ; Vidito, Chris ; Jackson, Matthew G ; Geist, Dennis
Assuntos: Basalt ; Chemical properties ; Core ; Core-mantle boundary ; Discovery and exploration ; Earth ; Earth Sciences ; Environmental Sciences ; Geochemistry ; Global Changes ; Helium ; Lava ; Magma ; Mantle ; Methods ; Mineralogy ; Natural history ; Nickel ; Partitioning ; Properties ; Sciences of the Universe ; Temperature ; Thermal properties
É parte de: Nature (London), 2013-01, Vol.493 (7432), p.393-397
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ObjectType-Article-2
ObjectType-Feature-1
Descrição: High (3)He/(4)He ratios in some basalts have generally been interpreted as originating in an incompletely degassed lower-mantle source. This helium source may have been isolated at the core-mantle boundary region since Earth's accretion. Alternatively, it may have taken part in whole-mantle convection and crust production over the age of the Earth; if so, it is now either a primitive refugium at the core-mantle boundary or is distributed throughout the lower mantle. Here we constrain the problem using lavas from Baffin Island, West Greenland, the Ontong Java Plateau, Isla Gorgona and Fernandina (Galapagos). Olivine phenocryst compositions show that these lavas originated from a peridotite source that was about 20 per cent higher in nickel content than in the modern mid-ocean-ridge basalt source. Where data are available, these lavas also have high (3)He/(4)He. We propose that a less-degassed nickel-rich source formed by core-mantle interaction during the crystallization of a melt-rich layer or basal magma ocean, and that this source continues to be sampled by mantle plumes. The spatial distribution of this source may be constrained by nickel partitioning experiments at the pressures of the core-mantle boundary.
Editor: England: Nature Publishing Group
Idioma: Inglês

Links

Voltar para lista de resultados

Realização: Logos de Redes Sociais:

Nickel and helium evidence for melt above the core-mantle boundary

Herzberg, Claude ; Asimow, Paul D ; Ionov, Dmitri A ; Vidito, Chris ; Jackson, Matthew G ; Geist, Dennis

England: Nature Publishing Group

Buscando em bases de dados remotas. Favor aguardar.