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

By Paul Tomascak, Tomáš Magna, Ralf Dohmen

This paintings summarizes the old development of the sphere of lithium (Li) isotope reports and offers a accomplished but succinct evaluate of the examine functions towards which they've been directed. In synthesizing the historic and present learn, 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 examine around the world (Tomascak, 2004). during this short while, using this isotope method within the research of geo- and cosmochemical questions has elevated dramatically, due, partially, to the arrival of latest analytical expertise on the finish of the final millennium. Lithium, as a gentle point that varieties low-charge, moderate-sized ions, manifests a few chemical houses that make its strong isotope approach necessary in a big selection of geo- and cosmochemical learn fields.

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2011; Monaco et al. 2011; Smith et al. 1995; Wallerstein and Sneden 1982), although the nature of these enrichments is not yet completely clear. The 7Li/6Li ratios in these massive stars do not differ from Li-poor regular stellar bodies (Andersen et al. 1984). It may be that 3He circulating from stellar atmospheres into deeper zones transforms into 7Be which decays to 7Li through (α,γ) reaction (Monaco et al. 2011). An important factor in this reaction (see also Sect. 1) is the need for a hot stellar environment (>107 K) to produce 7Be and its fast transport to cooler subsurface layers (<3 × 106 K) 3 Cosmochemistry of Lithium where the freshly synthesized 7Li is not consumed in nuclear reactions; it is called the Cameron–Fowler transport mechanism (Cameron and Fowler 1971).

15 LL3 L/LL5 L/LL4 L6 CARBONACEOUS CHONDRITES L5 L4 L3 C2 ungr. C3 ungr. 2 CO3 CO CK4 CM2 CI1 -4 -2 0 2 4 6 7Li (‰) Fig. 7 Lithium isotopic composition of different groups of chondritic meteorites. Several features are apparent. First, within rather large uncertainty, all major chondrite groups (carbonaceous, ordinary, enstatite) have broadly similar mean δ7Li, although the latter group has on average slightly lighter lower mean δ7Li. , Ornans, Dhurmsala, Bremervörde, Indarch). This indicates sample-scale heterogeneity; consequently, care should be exercised when analyzing chondritic materials.

An apparent difference between low-Ti and high-Ti basalts, as well as a more detailed assessment of Li systematics in volcanic glasses (Shearer et al. 1994), appear to rule out a single source for these major reservoirs. Notable depletion in Li has been found for ferroan anorthosites (FANs), representative of a significant portion of the lunar highlands. A rather limited variability has been observed for plutonic Mg-suite rocks (dunites, norites, troctolites). A trend toward Li-enriched character of the KREEP reservoir is obvious and is consistent with modelled Li abundance of 56 ppm (Warren and Wasson 1979) silicate lunar mantle is nearly identical to that of the Earth, with consequences for the Earth–Moon formation in a giant impact (Canup 2004) and subsequent turbulent exchange of hot ionized gas after the collision (Pahlevan and Stevenson 2007).

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