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《Geochimica》 2010-02
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Re-Os isotopic compositions of lunar materials:Implication for late accretion history of the Moon

XU Ji-feng,WANG Gui-qin,LI Jie and CHEN Jian-lin (Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China)  
Re-Os isotopic system is a particularly valuable tool to understand distributions of highly siderophile elements (HSE) within lunar mantle,and trace late accretion history of the Moon.It is still unclear for Re-Os isotopic compositions of the lunar materials.Published Re-Os isotopic data show that the mare basalts have very low Re and Os concentrations as well as long-term,chondritic 187Os/188Os ratios,meanwhile some lunar volcanic glasses and soils have relatively high Re and Os abundances as well as radiogenic Re-Os isotopic composition.It is generally accepted that HSE of the lunar mantle were depleted relative to chondrites,but those of Earth's mantle has sufficiently high abundances of the HSE (ca.0.008 times CI chondrite abundances).New Re-Os isotopic results of the lunar materials comfirm that the lunar mantle is indeed depleted,but a significant portion of the lunar and terrestrial late veneer may have been added relatively late in the evolution of the solar system by addition of meteoritic contaminant,i.e.,late accretion,resulting in enrichment of Os isotope and HSE on upper materials of the Earth and Moon.This late accretion process was long and prolonged.The late accreted materials were mainly added to the Earth-Moon system during 3.9-4.4 Ga.However,it is remain unknown if this late-accreted material was progressively added,or largely added during a relatively short time interval,which requires further Re-Os isotopic and HSE investigation for more lunar materials.
【Fund】: 国家自然科学基金(40873054 40930316)
【CateGory Index】: P184
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