Helium Isotopes At Rungwe Volcanic Province, Tanzania, and the Origin of East African Plateaux

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dc.creatorHilton, David R.
dc.creatorHalldórsson, Sæmundur A.
dc.creatorBarry, Peter H.
dc.creatorFischer, Tobias
dc.creatorDe Moor, J. M.
dc.creatorUmaña, Carlos J. R.
dc.creatorMangasini, Frank
dc.creatorScarsi, P.
dc.date2016-07-11T09:30:10Z
dc.date2016-07-11T09:30:10Z
dc.date2011-10
dc.descriptionFull text can be accessed at https://scripps.ucsd.edu/sites/scripps.ucsd.edu/files/communications-content/field_attachment/2014/Hilton11.pdf
dc.descriptionWe 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.
dc.identifierHilton, D.R., Halldórsson, S.A., Barry, P.H., Fischer, T.P., de Moor, J.M., Ramirez, C.J., Mangasini, F. and Scarsi, P., 2011. Helium isotopes at Rungwe Volcanic Province, Tanzania, and the origin of East African Plateaux. Geophysical Research Letters, 38(21).
dc.identifierhttp://hdl.handle.net/20.500.11810/3045
dc.identifier10.1029/2011GL049589
dc.languageen
dc.publisherWiley
dc.subjectHelium isotopes
dc.titleHelium Isotopes At Rungwe Volcanic Province, Tanzania, and the Origin of East African Plateaux
dc.typeJournal Article, Peer Reviewed

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