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- W46372954 abstract "Carbon and oxygen isotopic compositions of nyerereite and gregoryite phenocrysts and wholerock samples of natrocarbonatite lavas from the June 1988 eruption of Oldoinyo Lengai lie within restricted ranges of δ13C −6.3 to −7.1 and 5.8 to 6.7 for δ18O. These δ18O and δ13C values from unaltered natrocarbonatites and their carbonate phenocrysts support the conclusion that the carbonatitic magma was derived from the mantle and that their isotope composition was not changed by secondary isotopic exchange. Exposure to alteration under atmospheric conditions, weathering and hydration of the alkali carbonates at the surface produce distinctly higher δ18O, and also heavier δ13C values. A recent natrocarbonatite exposed to weathering for only several weeks shows δ18O and δ13C values of 17.4 and −3.3‰, respectively." @default.
- W46372954 created "2016-06-24" @default.
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- W46372954 date "1995-01-01" @default.
- W46372954 modified "2023-09-30" @default.
- W46372954 title "Stable Isotope Characteristics of Recent Natrocarbonatites from Oldoinyo Lengai" @default.
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- W46372954 doi "https://doi.org/10.1007/978-3-642-79182-6_9" @default.
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