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Tracing helium isotope compositions from mantle source to fumaroles at Oldoinyo Lengai volcano, Tanzania ArchiMer
Mollex, Gaelle; Furi, Evelyn; Burnard, Pete; Zimmermann, Laurent; Chazot, Gilles; Kazimoto, Emmanuel O.; Marty, Bernard; France, Lyderic.
Oldoinyo Lengai is the only volcano on Earth currently erupting natrocarbonatites, of which the source and genesis remain controversial. Cognate xenoliths and fumaroles were sampled at the summit of Oldoinyo Lengai, and deep crustal xenoliths from Oltatwa maar, in 2010 and 2014, after the 2007-2008 sub-Plinian eruption. The summit cognate xenoliths provide direct information on the isotopic composition of the mid-crustal magma chamber that was active during the 2007-2008 explosive eruption. Cognate xenolith-hosted pyroxenes from Oldoinyo Lengai have an average He-3/He-4 = 6.58 +/- 0.46 R-A, similar to values from nearby silicate volcanoes (4.95-7.30 R-A), and reflecting a sub-continental lithospheric mantle (SCLM) signature. This similarity implies that...
Tipo: Text Palavras-chave: Carbonatite; Neon; 2007-2008 eruption; SCLM; Cognate xenoliths; Helium; Neon; Argon.
Ano: 2018 URL:
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