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 finished but succinct assessment of the study purposes towards which they've been directed. In synthesizing the historic and present examine, the quantity additionally indicates potential destiny instructions of research. no longer even a whole decade has handed because the book of a extensively inclusive precis of Li isotope study around the world (Tomascak, 2004). during this little while, using this isotope approach 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 gentle point that types low-charge, moderate-sized ions, manifests a couple of chemical homes that make its reliable isotope method important in a big selection of geo- and cosmochemical learn fields.

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It is also speculated that a less significant proportion of 7Li may perhaps be formed in core-collapse Type II supernovae by neutrino interactions with predominantly 4He and 12C (Woosley et al. , Romano et al. 2001) and by 7 Be → 7Li reaction in novae, the latter type of stars being among significant Li suppliers (Romano et al. 2001; Tajitsu et al. 2015). Contrary to the clear variability in 7Li production owing to three different mechanisms (BBN, GCR, stellar nucleosynthesis), 6Li is nearly solely produced by spallative interactions of GCR with ISM.

2 cosmology. Ahrens et al. (1992) discussed that Li depletion of the Sun may have been completed during its pre-main sequence evolution, but this depends on the abundances of He and other metals, on the mixing length, and the thickness of an extra mixing layer. Some *200,000 km for the convective zone in the Sun, responsible for Li depletion, was calculated. However, if Li depletion by a factor of *150× is considered (roughly the extent of depletion found in the Sun relative to meteoritic matter; Anders and Grevesse 1989), then parallel problems arise with too little Be depletion compared to the observations.

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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