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《Earth Science(Journal of China University of Geosciences)》 2009-01
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Discussion on Fractionation Mechanism of Lithium Isotopes

TANG Yan-jie,ZHANG Hong-fu,Ying Ji-feng State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing100029,China  
As a burgeoning tracer of stable isotopes,lithium geochemistry has attracted increasing attention from the international geological community recently.Its application field covers the interactions between fluids and minerals from the surface to the mantle.During weathering,the lighter isotope 6Li is preferentially retained in the solid phase while 7Li goes into solution.Thus river waters have heavy Li isotopic compositions compared to the original bedrock.The heavy Li isotopic compositions of river water feed the oceans.Low-temperature alteration of oceanic crust then makes seawater heavier than river water.In a subduction zone,heavy Li of fluids escaping the slab at low temperature likely enrich the forearc mantle wedge and hydrate the adjacent mantle and make them isotopically heavier than before.Meanwhile,an isotopically light component of slab dehydrated is subducted deeply and may form a locally light-Li mantle reservoir.There are three main factors that can result Li isotopic fractionation in mantle peridotites.They are temperature,diffusion-driven fractionation and mixing with exotic melts.At high temperatures of magmatic processes,Li isotopes do not show per mil-level mass fractionation,and simple diffusive process can not account for the Li isotopic fractionation between the minerals in peridotitic xenoliths from the Hannuoba area in the North China Craton,thus the reaction between peridotites and melts with light Li isotopic compositions maybe a reasonable explanation.It should point out that diffusion of Li isotopes during peridotite-melt reaction makes some contributions to the isotopic fractionation between the mantle minerals.
【Fund】: 中国科学院知识创新工程重要方向项目(No.KZCX-YW-103);; 国家自然科学基金项目(Nos.40534022 40773026)
【CateGory Index】: P597
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 Zhang Hongfu, Tang Yanjie, Zhao Xinmiao, Yang YuehengState Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Significance and prospective of non-traditional isotopic systems in mantle geochemistry[J];Earth Science Frontiers;2007-02
【Co-citations】
Chinese Journal Full-text Database 1 Hits
1 ZHOU Xin-hua(Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China);Major Transformation of Subcontinental Lithosphere beneath North China in Cenozoic-Mesozoic:Revisited[J];Geological Journal of China Universities;2009-01
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Chinese Journal Full-text Database 7 Hits
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