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Origin of Light Noble Gases (He, Ne, and Ar) on Earth: A Review 5
Peron, Sandrine; Moreira, Manuel; Agranier, Arnaud.
We review the different scenarios for the origin of light noble gases (He, Ne, and Ar) on Earth. Several sources could have contributed to the Earth's noble gas budget: implanted solar wind, solar nebula gas, chondrites, and comets. Although there is evidence for solar-like neon in the Earth's mantle, questions remain as to its origin. A new compilation of noble gas data in lunar soils, interplanetary dust particles, micrometeorites, and solar wind allows examination of the implanted solar wind composition, which is key to understanding the solar-like mantle neon isotope composition. We show that lunar soils that reflect this solar-wind-implanted signature have a Ne-20/Ne-22 ratio very close to that of ocean island basalts. New data and calculations...
Tipo: Text Palavras-chave: Volatile origin; Helium; Neon; Argon; Solar wind implantation.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00638/74992/75837.pdf
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Tracing helium isotope compositions from mantle source to fumaroles at Oldoinyo Lengai volcano, Tanzania 5
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: https://archimer.ifremer.fr/doc/00638/74994/75820.pdf
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