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《中国科学院地质与地球物理研究所第十届(2010年度)学术年会论文集(上)》2011年
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A brief review of isotopically light Li-a feature of the enriched mantle?

【摘要】:正Lithium isotope geochemistry is increasingly being used to trace deep-earth processes, reflecting the observed large variation of Li isotope ratios in mantle-derived rocks, including peridotite xenoliths associated with ancient continents.We briefly review the Li isotopic compositions of major geochemical reservoirs,the assumed mechanisms of Li isotopic fractionation,and,in particular,the origins of isotopically light Li in mantle-derived rocks based on the latest developments in Li isotope geochemistry.Comparison of Li isotope data with existing Sr-Nd isotope ratios reflects the subduction-recycling of ancient oceanic crust and the reappearance of Li in volcanic rocks.This circulation may play an important role in generating the isotopically light-Li component in the mantle-perhaps the enriched mantle end member defined by the Sr-Nd isotopic compositions of oceanic basalts.

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