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Helium isotopes at Rungwe volcanic province, Tanzania, and the origin of east African plateaux. (Articolo in rivista)

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Helium isotopes at Rungwe volcanic province, Tanzania, and the origin of east African plateaux. (Articolo in rivista) (literal)

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Hilton, D.R.(1), Halldórsson, S.A.(1), Barry, P.H.(1), Fischer, T.P.(2), De Moor, J.M.(2), Ramirez, C.J.(3), Mangasini, F.(4), Scarsi, P.(5) (2011)
Helium isotopes at Rungwe volcanic province, Tanzania, and the origin of east African plateaux.
in Geophysical research letters (Online); American Geophysical Union, Washington (Stati Uniti d'America)
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Hilton, D.R.(1), Halldórsson, S.A.(1), Barry, P.H.(1), Fischer, T.P.(2), De Moor, J.M.(2), Ramirez, C.J.(3), Mangasini, F.(4), Scarsi, P.(5) (literal)

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ID_PUMA: /cnr.igg/2011-A0-057 Area di valutazione 04 - Scienze della Terra (literal)

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(1)Fluids and Volatiles Laboratory, Scripps Institution of Oceanography, University of California, San Diego, United States; (2) Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, United States; (3) Centro de Investigaciones en Ciencias Geologicas, Escuela Centroamericana de Geologia, Universidad de Costa Rica, Costa Rica; (4)Department of Chemical and Mining Engineering, University of Dar Es Salaam, Dar es Salaam, Tanzania; (5)Institute of Geosciences and Earth Resources, National Research Council of Italy, Pisa I-56124, Italy. (literal)

Titolo

Helium isotopes at Rungwe volcanic province, Tanzania, and the origin of east African plateaux. (literal)

Abstract

We report helium isotope ratios (3He/4He) of lavas and tephra of the Rungwe Volcanic Province (RVP) in southern Tanzania. Values as high as 15RA (RA = air 3He/4He) far exceed typical upper mantle values, and are the first observation of plume-like ratios south of the Turkana Depression which separates the topographic highs of the Ethiopia and Kenya domes. The African Superplume - a tilted low-velocity seismic anomaly extending to the core-mantle boundary beneath southern Africa - is the likely source of these high 3He/4He ratios. High 3He/4He ratios at RVP together with similarly-high values along the Main Ethiopian Rift and in Afar provide compelling evidence that the African Superplume is a feature that extends through the 670-km seismic discontinuity and provides dynamic support - either as a single plume or via multiple upwellings - for the two main topographic features of the East Africa Rift System as well as heat and mass to drive continuing rift-related magmatism (literal)

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