By Paul Tomascak, Tomáš Magna, Ralf Dohmen
This paintings summarizes the ancient development of the sector of lithium (Li) isotope experiences and offers a complete but succinct assessment of the study purposes towards which they've been directed. In synthesizing the old and present learn, the quantity additionally indicates potential destiny instructions of analysis. no longer even an entire decade has handed because the ebook of a largely inclusive precis of Li isotope learn worldwide (Tomascak, 2004). during this little while, using this isotope method within the research of geo- and cosmochemical questions has elevated dramatically, due, partly, to the arrival of recent analytical expertise 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 strong isotope method invaluable in a wide range of geo- and cosmochemical examine fields.
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Additional info for Advances in Lithium Isotope Geochemistry
2006) by Leya (2011) partly re-assessed the validity of such an isochron although care must be exercised in proper handling of cosmogenic effects as well as statistical evaluation, combined with cautious petrography. The non-trivial task of obtaining information from presolar grains has been evaluated by Fujiya et al. (2011) who, using the NanoSIMS technique, investigated Li (and B) isotopic compositions in 12 SiC X grains, thought to originate in Type II supernovae. However, all of the grains analyzed by Fujiya et al.
1 Big Bang Nucleosynthesis (BBN) nuclear reactions up to CNO (modiﬁed from Coc et al. 2012). Deuterium formation represents a key event for the subsequent chain of nuclear reactions Cosmochemistry of Lithium C 12 11 C d,n p, B , 1 H n, H 2 d,n p, d, 7 Li n, Li 8 d,n , He d,p 4He n, p d,n p, 3 Be B 12 d, p, p, p, d, T,n Li 6 9 d,p , ,p p, T, B ,n , Be n T,p 7 11 10 d,p H 3 n heavier than H and He. It is deﬁned as follows: [Fe/H] = log10 (NFe/NH)star – log10(NFe/NH)Sun (N = number of atoms per unit of volume; Fe is taken as an element that is easy to measure in the visible spectrum and, more importantly, an element fully synthesized in stars and not during BBN).
Steele et al. (1980) also found a positive correlation between Li and Na, although maﬁc mineral phases host signiﬁcant amounts of Li and plagioclase is the principal carrier for Na. This may mean that buoyant anorthositic lunar crust was derived from a roughly common reservoir whereas high but variable Li contents in plagioclase from Mg-rich lithologies either reflect several isolated and localized sources, or were actively communicating with those regions of residual lunar magma ocean that were not yet solidiﬁed.
Advances in Lithium Isotope Geochemistry by Paul Tomascak, Tomáš Magna, Ralf Dohmen