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

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By Paul Tomascak, Tomáš Magna, Ralf Dohmen

ISBN-10: 3319014293

ISBN-13: 9783319014296

ISBN-10: 3319014307

ISBN-13: 9783319014302

This paintings summarizes the old development of the sector of lithium (Li) isotope stories and offers a finished but succinct assessment of the examine functions towards which they've been directed. In synthesizing the ancient 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 largely inclusive precis of Li isotope learn worldwide (Tomascak, 2004). during this short while, using this isotope procedure within the research of geo- and cosmochemical questions has elevated dramatically, due, partly, to the appearance of latest analytical expertise 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 sturdy isotope procedure worthy in a big selection of geo- and cosmochemical learn fields.

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Very low metallicity of the Spite plateau stars) and Solar. It has been known that in its post-BBN evolution, the lithium abundance increased from a low primordial value to the value inferred from the Solar System or from the interstellar medium of the Galaxy. The results of Howk et al. (2012) are expectedly intermediate between the Spite plateau and the Solar abundance but they lack a model for evolution of the primordial abundance of Li. During the subsequent evolution of the Universe, primordial 7Li decreased due to astration, the destruction of 7Li in stars (in particular important at high metallicities), but was constantly replaced by production from other sources.

Steele et al. (1980) measured Li contents in plagioclase from a wide spectrum of lunar rocks, including anorthosites, troctolites, norites, breccias, and mare basalts. 2 and 21 ppm Li, with an extraordinary plagioclase measurement from a KREEP basalt clast from sample 15344 having 54 ppm Li. The latter concentration reinforces the incompatible element-enriched nature of KREEP (Warren and Wasson 1979). 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.

2012) were not able to statistically distinguish between planet-hosting and planet-free stellar systems despite multiple constraints on surface temperature, mass and metallicity. They concluded that some of the foreseen differences in Li abundance may stem from subtle disparity in these key stellar parameters between the two compared groups. Recently, Figueira et al. (2014) employed more stringent statistical tools for larger data set and found that differences in stellar surface Li abundance exist at statistically significant levels (>3σ) for planet-devoid and planet-harboring stars whereas a difference in Li abundances at *7σ level was found for a selected population of stars analyzed by Delgado Mena et al.

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

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