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 sector of lithium (Li) isotope stories and gives a finished but succinct evaluation of the examine functions towards which they've been directed. In synthesizing the old and present study, the quantity additionally indicates potential destiny instructions of research. now not even a whole decade has handed because the booklet of a commonly inclusive precis of Li isotope study world wide (Tomascak, 2004). during this few minutes, using this isotope procedure within the research of geo- and cosmochemical questions has elevated dramatically, due, partially, to the appearance of latest analytical expertise on the finish of the final millennium. Lithium, as a gentle aspect that varieties low-charge, moderate-sized ions, manifests a few chemical homes that make its good isotope approach priceless in a wide range of geo- and cosmochemical examine fields.

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It is generally difficult to obtain 7Li/6Li ratios for stars (Piau 2008) due to technical complexities in resolving the spectra of 6Li and 7Li. As a consequence, the measured 7Li/6Li ratios are usually very high and burdened by large analytical errors. , García Pérez et al. 2009; Hobbs and Thorburn 1994; Hobbs et al. 1999; Maurice et al. 1984; Nissen et al. 1999). In this respect, both the low-mass halo stars and metal-poor stars apparently play the determining role in models of evolution of Li and its isotopes because their lifetimes are comparable to those of the Galaxy itself and because precise measurements of individual Li abundances in such stars may be critical in constraining the Galactic history and evolution.

Lind et al. (2013) found very high 7Li/6Li ratios in several metal-poor stars, showing that these were indeed devoid of 6Li, attesting to standard models of BBN evolution. High 7Li/6Li ratios, practically at the edge of current instrumental analytical capabilities, appear to be the common feature of stars. For example, Ghezzi et al. (2009) measured 7 Li/6Li ratios in several stars and despite many technical barriers and the need for many corrections, they found very high 7Li/6Li ratios (≥125) within analytical errors for all studied cases.

Nevertheless, translated into bulk lunar geology, there is no detectable shift in δ7Li for magmatic rocks (Magna et al. 2006; Seitz et al. 2006), making them suitable candidates in which to study processes of extreme magmatic differentiation in the lunar magma ocean (Snyder et al. , Hauri et al. 2011; Saal et al. 2008; Sharp et al. 2010). This may be important by considering a possible role of chemistry of mineral phases that build Li into their structures and that may thus reflect changes in conditions during magmatic fractionation and/or thermal metamorphism (Chaklader et al.

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