Phyllosilicate Absorption Features in Main-Belt and Outer-Belt Asteroid Reflectance Spectra
Phyllosilicate Absorption Features in Main-Belt and Outer-Belt Asteroid Reflectance Spectra
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DOI：
10.1126/science.246.4931.790
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发表时间：
1989-06
期刊：
影响因子：
56.9
通讯作者：
F. Vilas;M. Gaffey
中科院分区：
文献类型：
--
作者：
F. Vilas;M. Gaffey
在主带以及Cybele和Hilda群的16颗暗小行星的高质量、高分辨率反射光谱中，确定了深度达5%的吸收特征。其中一些小行星存在类似的CM2碳质球粒陨石，这表明这些陨石是由于在小行星表面通过水蚀变过程形成的层状硅酸盐中的铁氧化物。位于主带外缘之外的另外10颗小行星的光谱没有显示出明显的吸收特征，这表明水蚀变并不总是在这些日心距离上发生。
Absorption features having depths up to 5% are identified in high-quality, high-resolution reflectance spectra of 16 dark asteroids in the main belt and in the Cybele and Hilda groups. Analogs among the CM2 carbonaceous chondrite meteorites exist for some of these asteroids, suggesting that these absorptions are due to iron oxides in phyllosilicates formed on the asteroidal surfaces by aqueous alteration processes. Spectra of ten additional asteroids, located beyond the outer edge of the main belt, show no discernible absorption features, suggesting that aqueous alteration did not always operate at these heliocentric distances.