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Distinguishing silicate and carbonatite mantle metasomatism by using lithium and its isotopes

Distinguishing silicate and carbonatite mantle metasomatism ...

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中国科学院地质与地球物理研究所2014年度（第14届）...

作者： Ben-Xun Su Hong-Fu Zhang Etienne Deloule Nathalie Vigier Yan Hu Yan-Jie Tang Yan Xiao Patrick Asamoah Sakyi State Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Centre National de la Recherche Scientifique CRPGBP2054501 Vandoeuvre-Les-Nancy CedexFrance Isotope Laboratory Department of Earth and Space SciencesUniversity of Washington Department of Earth Science University of Ghana

To investigate the effects of silicate and carbonatite metasomatism on mantle heterogeneity, we report lithium(li) concentrations and isotopic compositions for olivine(Ol), orthopyroxene(Opx) and clinopyroxene(Cpx)from two suites of mantle xenoliths(Hannuoba, the North China Craton, and Haoti, the Western Qinling Orogen).The Hannuoba xenoliths range from lherzolite to pyroxenite and were affected by silicate metasomatism, whereas the Haoti xenoliths vary from harzburgite to wehrlite and were affected by carbonatite metasomatism. lithium concentrations and isotopic compositions display a dichotomy between Hannuoba and Haoti xenoliths, and the overall variation exceeds what was previously reported. The minerals from Haoti xenoliths are more enriched in li(Ol: 1.23–13.2 ppm;Opx: 3.00–82.8 ppm;Cpx: 1.39–112 ppm) than those from Hannuoba samples(Ol: 1.34–5.52 ppm;Opx: 0.23–16.1 ppm;Cpx: 1.18–79.8 ppm). lithium isotopic compositions of these samples are highly variable in both suites of samples. δ7li ranges from + 3.0‰ to + 41.9‰ in Ol, from-21.0‰ to +20.2‰ in Opx and from-17.4‰ to +18.9‰ in Cpx for Hannuoba samples. Haoti minerals display a similar degree of variation with δ7li ranging from-29.1‰ to + 19.9‰ in Ol,-16.9‰ to + 18.0‰ in Opx and-45.1‰ to +19.6‰ in Cpx. On average, li isotopic compositions of minerals from Hannuoba xenoliths follow the sequence of δ7li Ol N δ7li Opx N δ7li Cpx, whereas those from Haoti xenoliths are characterized by the opposite sequence of δ7li Cpx N δ7li Opx N δ7li Ol;in particular there is considerable difference in δ7li values of Ol. The li elemental and isotopic data suggest that mantle metasomatism by distinct agents is an important process for generating the large heterogeneity of li abundances and isotopic distribution in the lithospheric mantle. The distinct geochemical characteristics of li isotopes in silicate and carbonatite metasomatism are closely related to the preferential incorporation of li into minerals from distinct melts.

关键词： li isotopes mantle xenolith carbonatite metasomatism silicate metasomatism lithospheric mantle

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