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• W1990234081 abstract "We present new helium isotope data from the Macdonald seamount (Austral chain). The helium isotopic ratio varies from 4He/3He=45 000 (R/Ra=16.0) to 200 170 (R/Ra=3.6). The helium content is between 1.5×10−8 and 1.1×10−5 ccSTP/g. These helium results show clearly the presence of primitive mantle material in the source of the Austral chain. Macdonald has the lowest 4He/3He ratio among the Polynesian submarine volcanoes, except Hawaii (Loihi). The simplest explanation for the primitive helium signature is the presence under Macdonald of a mantle plume that derives either from the 670 km or 2900 km boundary layers, or, eventually, from the top of a large mantle dome resulting from a stratified two-layer convection. This plume contains less-degassed material with low 4He/3He ratio. To cite this article: M. Moreira, C. Allègre, C. R. Geoscience 336 (2004). Nous présentons des données nouvelles d'hélium obtenues sur des verres frais prélevés sur le mont sous-marin de Macdonald (Australes). Le rapport isotopique de l'hélium 4He/3He varie de 45 000 (R/Ra=16,0 où R est le rapport 3He/4He et Ra le rapport de l'air) à 200 170 (R/Ra=3,6). Les concentrations sont parmi les plus élevées mesurées dans des basaltes de points chauds (entre 1,5×10−8 et 1,1×10−5 ccSTP/g). Ces résultats d'hélium montrent clairement la présence d'un composant primordial dans la source des Australes. Macdonald a le rapport de l'hélium le plus primitif parmi les volcans sous-marins du Pacifique (à part Loihi). L'explication la plus simple pour cette signature primordiale est la présence d'un panache sous le point chaud de Macdonald. Celui-ci peut provenir, soit de la discontinuité de 670 km, de la limite noyau-manteau, ou bien encore du sommet d'un grand dôme résultant d'une convection à deux étages. Ce panache contient du matériel moins dégazé que la source des MORB. Pour citer cet article : M. Moreira, C. Allègre, C. R. Geoscience 336 (2004)." @default.
• W1990234081 created "2016-06-24" @default.
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• W1990234081 date "2004-08-01" @default.
• W1990234081 modified "2023-10-14" @default.
• W1990234081 title "Helium isotopes on the Macdonald seamount (Austral chain): constraints on the origin of the superswell" @default.
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• W1990234081 doi "https://doi.org/10.1016/j.crte.2004.04.006" @default.
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