Geochemistry

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

By Paul Tomascak, Tomáš Magna, Ralf Dohmen

This paintings summarizes the ancient development of the sphere of lithium (Li) isotope stories and gives a finished but succinct evaluate of the study purposes towards which they've been directed. In synthesizing the old and present study, the quantity additionally indicates potential destiny instructions of analysis. now not even a whole decade has handed because the ebook of a commonly inclusive precis of Li isotope study all over the world (Tomascak, 2004). during this little while, using this isotope procedure within the research of geo- and cosmochemical questions has elevated dramatically, due, partially, to the arrival of recent analytical know-how on the finish of the final millennium. Lithium, as a gentle aspect that types low-charge, moderate-sized ions, manifests a few chemical houses that make its strong isotope procedure important in a big selection of geo- and cosmochemical examine fields.

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Knauth et al. 2003, 2000). Further support for varying 7Li/6Li ratios across the Galaxy, or at least across the Solar System, has since come from in situ analyses of presolar SiC grains thought to represent the oldest and chemically and physically extremely resistant material of the Solar System available (Gyngard et al. 2009; Lyon et al. 2007). These studies have shown that some sub-chondritic 7 Li/6Li ratios (down to *9) may be related to contribution from GCR spallation reactions, yielding 6Li excess.

Lithium-7 is an important child of BBN and can be produced by two chains of reactions: (i) T (α,γ)7Li, and (ii) 3He(α,γ)7Be(n,p)7Li. The 7 Be → 7Li decay via electron capture appears to be responsible for c. 90 % of the 7Li formed during BBN; the remaining *10 % was synthesized directly as primordial 7Li. The 7Be half-life of c. 1 days was measured by Jaeger et al. 22 days is given by Audi et al. (2003). Despite its consumption much 7 Be remained alive until BBN ceased (Fig. 2). Conversely, 7Li is mostly destroyed by the reaction 7Li(p,α)4He.

Ritzenhoff et al. 1997). The early measurements of Eugster and Bernas (1971), however, were unsuccessful in determining 7Li excess in two lunar breccias (10046 and 10074) and a coarse-grained soil (10084), potentially due to long exposure of surface. Empirical support for heavy Li enrichment in solar wind arrived more recently, through high-resolution spatial analysis of individual lunar soil particles (Chaussidon and Robert 1999). Estimates from the analysis by Chaussidon and Robert (1999) of Apollo soils 10060, 79035, 79221 and 79261 suggested that solar wind had very high 7Li/6Li of *31, whereas the bulk Earth value is *12.

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