Volcanism and Evolution of the African Lithosphere

Evolution of the lithospheric mantle beneath the East African Rift in Tanzania and its potential signatures in rift magmas
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Published:June 01, 2011
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Sonja Aulbach, Roberta L. Rudnick, William F. McDonough, 2011. "Evolution of the lithospheric mantle beneath the East African Rift in Tanzania and its potential signatures in rift magmas", Volcanism and Evolution of the African Lithosphere, Luigi Beccaluva, Gianluca Bianchini, Marjorie Wilson
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New and published whole-rock major-element contents of xenolithic peridotites, combined with mineral trace-element, 87Sr/86Sr, 143Nd/144Nd, and 3He/4He isotopic compositions, are used to unravel the metasomatic history of lithospheric mantle sampled by volcanic pipes in the Tanzanian section of the East African Rift. The deepest portion of the mantle beneath Labait (craton margin) exhibits high-μ (HIMU)–like 87Sr/86Sr (0.7029), 143Nd/144Nd (0.51286), and 3He/4He (5.9), which may reflect the plume in this region. Within the Mozambique belt, recent calcio-carbonatite melt metasomatism has overprinted the mantle...
- Africa
- alkaline earth metals
- Archean
- carbonatites
- chemical composition
- continental crust
- crust
- East Africa
- East African Rift
- geochemical anomalies
- He-4/He-3
- helium
- igneous rocks
- inclusions
- intrusions
- isotope ratios
- isotopes
- lava
- lithosphere
- magmas
- major elements
- mantle
- mantle plumes
- melts
- metals
- metasomatism
- mineral composition
- Mozambique Belt
- Nd-144/Nd-143
- neodymium
- noble gases
- overprinting
- peridotites
- pipes
- plate tectonics
- plutonic rocks
- Precambrian
- rare earths
- rift zones
- sample preparation
- Sr-87/Sr-86
- stable isotopes
- strontium
- subduction
- Tanzania
- trace elements
- Turkana Basin
- ultramafics
- whole rock
- xenoliths
- Lashaine Tanzania
- Rungwe Tanzania
- Labait Tanzania