Mössbauer studies of Luna 16 and 20 lunar soils
Mössbauer studies of Luna 16 and 20 lunar soils
复制标题
穆斯堡尔对 Luna 16 和 20 月球土壤的研究
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
N. N. Greenwood
中科院分区：
文献类型：
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作者：
T. Gibb;R. Greatrex;N. N. Greenwood
由月球16号和月球20号分别从丰海和阿波罗尼乌斯G陨石坑附近的高地带回的月壤样品已经用57 Fe穆斯堡尔谱进行了研究。这使得能够确定各种矿物相之间的总铁含量的分布。未检测到硫铁矿、磁铁矿或Fe 3+，并且未考虑在细粒分离物中存在大量钛尖晶石（Fe 2 TiO 4）的建议。所示的光谱产生的金属铁相，并从铁2+在橄榄石中，在M1和M2位的辉石，在钛铁矿和玻璃。光谱的轻微不对称性归因于最细粒子中的超顺磁性铁，并认为这是由太阳风还原形成的。月球16号土壤的钛铁矿含量高于阿波罗12号、14号和15号土壤，但低于阿波罗11号土壤;月球20号土壤的钛铁矿含量特别低。两次月球任务的土壤都显示出橄榄石和M1辉石地点的铁含量增加，与阿波罗15号在哈德利河边缘发现的土壤相当。月球20号土壤的穆斯堡尔谱中较窄的线宽表明，该样品中含铁玻璃相的比例低于月球16号土壤。
Samples of lunar soil returned by Luna 16 from Mare Fecunditatis and by Luna 20 from the highlands near the crater Appolonius G have been studied by 57Fe Mössbauer spectroscopy. This enables the distribution of the total iron content between the various mineral phases to be determined. No troilite, magnetite or Fe3+ was detected and the suggestion that ulvospinel (Fe2TiO4) is present in substantial amounts in the fine-particle separates is discounted. The spectra were shown to arise from a metallic iron phase, and from Fe2+ in olivine, in the M l and M2 sites of pyroxene, in ilmenite and in glasses. The slight asymmetry of the spectra is ascribed to superpara-magnetic iron in the finest particles and it is considered that this is formed by solar-wind reduction. The ilmenite content of the Luna 16 soil is higher than for Apollo 12, 14 and 15 soils but less than for Apollo 11 soil; the ilmenite content of the Luna 20 soil is exceptionally low. The soils from both Luna missions show an increased amount of iron in olivine and M1 pyroxene sites comparable with that found for Apollo 15 soils from the edge of Hadley Rille. The narrower linewidths in the Mössbauer spectra of the Luna 20 soil suggest that the proportion of iron-containing glassy phases in this sample is lower than for the Luna 16 soil.