SU Ben-xun
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Abstract：With development of in-situ analytical techniques, Li isotopic compositions of minerals at micro scale can be obtained and can be used to trace high-temperature processes. This paper is a summary of some case studies on application of Li isotopes in mantle geochemistry. The study on the mantle xenoliths from Hannuoba and Haoti indicates Li isotopes can act as a discriminator of silicate and carbonatite metasomatism agents. The dataset of the mantle xenoliths from North China Craton reveals that Li isotopes heterogeneity in the mantle resulted from multiple and diverse metasomatism. The first Li isotope study on Alaskan-type mafic-ultramafic intrusion demonstrates potential controlling factors(hydrous component, oxygen fugacity and evolved degree of magmas)of Li isotopic fractionation during magma differentiation. Preliminary study on the Luobusa ophiolite suggests that Li isotope systematics will be an alternative geochemical tracer to constrain the formation and evolution of ophiolites and genesis of chromite.

Key words：mantle metasomatism mantle heterogeneity magma differentiation Li isotopes ophiolite

E-Mail: subenxun@mail.igcas.ac.cn  

Bulletin of Mineralogy, Petrology and Geochemistry Vol.36, No.1, 2017, page 6-13