Geochemical isotope thermometry

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Valley JW (1986) Stable isotope geochemistry of metamorphic rocks. Rev Miner 16 445 89 Valley JW (2001) Stable isotope thermometry at high temperatures. Rev Miner Geochem 43 365 13... 

The significant relative mass difference (c. 16%) between the two stable isotopes of Li (approximately Li 7.5%, Li 92.5%), coupled with broad elemental dispersion in Earth and planetary materials, makes this a system of considerable interest in fingerprinting geochemical processes, determining mass balances, and in thermometry. Natural mass fractionation in this system is responsible for c. 6% variation among materials examined to date (Fig. 1). Although the modem era of Li isotope quantification has begun, there are still many questions about the Li isotopic compositions of fundamental materials and the nature of fractionation by important mechanisms that are unanswered (e.g., Hoefs 1997). 

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