Advances in Lithium Isotope Geochemistry by Paul Tomascak, Tomáš Magna, Ralf Dohmen

By Paul Tomascak, Tomáš Magna, Ralf Dohmen

This paintings summarizes the historic development of the sphere of lithium (Li) isotope experiences and gives a complete but succinct evaluation of the examine purposes towards which they've been directed. In synthesizing the historic and present examine, the amount additionally indicates potential destiny instructions of research. no longer even an entire decade has handed because the book of a largely inclusive precis of Li isotope examine world wide (Tomascak, 2004). during this couple of minutes, using this isotope process within the research of geo- and cosmochemical questions has elevated dramatically, due, partially, to the arrival of latest analytical know-how on the finish of the final millennium. Lithium, as a mild aspect that kinds low-charge, moderate-sized ions, manifests a few chemical homes that make its sturdy isotope procedure necessary in a big selection of geo- and cosmochemical study fields.

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Advances in Lithium Isotope Geochemistry

This paintings summarizes the ancient development of the sphere of lithium (Li) isotope stories and offers a entire but succinct evaluation of the examine purposes towards which they've been directed. In synthesizing the ancient and present examine, the amount additionally indicates potential destiny instructions of analysis.

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1). , 7 Li/6Li * 104; Hammache et al. 2010; Nollett et al. 1997; Vangioni-Flam et al. 2000, 1999). Most 6Li is produced by much more efficient spallation-induced energetic collisions of GCR through p, α + He and CNO → 6Li, 7Li, and fast nuclei (α, C, O) fragmenting on H and He in the ISM (Vangioni-Flam et al. 1999). We refer to a detailed review by Prantzos (2012) for the history and physical processes of Li evolution. It is generally accepted that the combined reactions of energetic cosmic ray C–N–O nuclei, and cosmic ray H–He interacting with ambient interstellar C, N and O species produce low-energy Li, Be and B nuclei.

1 Cosmology of Lithium: Big Bang Nucleosynthesis, Evolution of the Universe … The 7Li/6Li ratios of the local ISM appear to be generally in the Solar range, based on observations of other elements (Be, C, O) whose abundances are consistent with an input from environment where some Li is also synthesized, such as asymptotic giant branch stars, Type II supernovae or GCR. Webber et al. (2002) have used data collected with the Voyager 1 and 2 spacecraft and included periods where levels of the Solar modulation of energy spectra of various nuclei (6Li, 7Li, 7 Be, 9Be, 10B and 11B) were at minima (1986– 1988, 1996–2000).

Murty et al. (1982) investigated iron meteorites from several classes and found that Li is distributed heterogeneously in these meteorites. Moreover, most Li appeared to be concentrated in a non-magnetic fraction whereas the magnetic fraction retains a subordinate proportion of Li. , Cape York, Henbury) iron meteorites was found (>*20 ppb in IA–IIAB vs. *5 ppb in IIIA). However, no further investigations were made that considered these meteorite classes. Given the low abundances of Li in metal, consistent with its lithophile character, the possible implications for histories of the respective parent bodies of iron meteorites may be rather limited.

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