首页|Nature of the lunar far-side samples returned by the Chang'E-6 mission
Nature of the lunar far-side samples returned by the Chang'E-6 mission
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The Chang'E-6(CE-6)mission successfully achieved return of the first samples from the far side of the Moon.The sampling site of CE-6 is located in the South Pole-Aitken(SPA)basin-the largest,deepest and oldest impact basin on the Moon.The 1935.3 g of CE-6 lunar samples exhibit distinct characteristics compared with previous lunar samples.This study analyses the physical,mineralogical,petrographic and geochemical properties of CE-6 lunar scooped samples.The CE-6 soil has a significantly lower bulk density(0.983 g/cm3)and true density(3.035 g/cm3)than the Chang'E-5(CE-5)samples.The grain size of the CE-6 soil exhibits a bimodal distribution,indicating a mixture of different compositions.Mineralogically,the CE-6 soil consists of 32.6％plagioclase(anorthite and bytownite),19.7％augite,10％pigeonite and 3.6％orthopyroxene,and with low content of olivine(0.5％)but high content of amorphous glass(29.4％).Geochemically,the bulk composition of CE-6 soil is rich in Al2O3(14％)and CaO(12％)but low in FeO(17％),and trace elements of CE-6 soil such as K(～630 ppm),U(0.26 ppm),Th(0.92 ppm)and rare-earth elements are significantly lower than those of the lunar soils within the Procellarum KREEP Terrane.The local basalts are characterized by low-Ti(TiO2,5.08％),low-Al(Al2O3 9.85％)and low-K(～830 ppm),features suggesting that the CE-6 soil is a mixture of local basalts and non-basaltic ejecta.The returned CE-6 sample contains diverse lithic fragments,including local mare basalt,breccia,agglutinate,glasses and leucocrate.These local mare basalts document the volcanic history of the lunar far side,while the non-basaltic fragments may offer critical insights into the lunar highland crust,SPA impact melts and potentially the deep lunar mantle,making these samples highly significant for scientific research.
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