Featureless spectra on the Moon as evidence of residual lunar primordial crust
Featureless spectra on the Moon as evidence of residual lunar primordial crust
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月球上无特征的光谱作为残留月球原始地壳的证据
DOI：
10.1002/2015je004935
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and J. Haruyama
中科院分区：
文献类型：
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作者：
Yamamoto;S.;R. Nakamura;T. Matsunaga;Y. Ogawa;Y. Ishihara;T. Morota;N. Hirata;M. Ohtake;T. Hiroi;Y. Yokota;and J. Haruyama
我们报告的全球分布的地区表现出没有吸收功能（无特征或FL）在月球表面上，基于反射光谱数据集获得的光谱轮廓仪船上的辉屋/SELENE。我们发现FL站点位于Feldspathic高地地体的撞击盆地和大型撞击坑中，而Procellarum地区和南极-艾特肯盆地都没有FL站点。各撞击坑/坑内的FL点主要分布在峰环或峰缘，其中也有最纯的斜长岩（PAN）点，在局部尺度上，FL点和PAN点大多与撞击坑和峰有关。大部分的FL光谱显示出比PAN光谱更陡（更红）的连续性，这表明空间风化效应的发生。我们建议，大多数材料表现出FL光谱来自空间风化PAN。考虑到所有的发生趋势的FL网站在月球上，我们建议，无论是FL和PAN材料挖掘的原始月球地壳在古代盆地形成的陨石下面的高地。由于FL和PAN站点广泛分布在月球表面，我们的新数据可能支持月球表面下方存在大量PAN层。
We report the global distribution of areas exhibiting no absorption features (featureless or FL) on the lunar surface, based on the reflectance spectral data set obtained by the Spectral Profiler onboard Kaguya/SELENE. We found that FL sites are located in impact basins and large impact craters in the Feldspathic Highlands Terrane, while there are no FL sites in the Procellarum regions nor the South Pole‐Aitken basin. FL sites in each impact basin/crater are mainly found at the peak rings or rims, where the purest anorthosite (PAN) sites are also found. At the local scale, most of the FL and PAN points are associated with impact craters and peaks. Most of the FL spectra show a steeper (redder) continuum than the PAN spectra, suggesting the occurrence of space weathering effects. We propose that most of the material exhibiting a FL spectrum originate from space weathered PAN. Taking into account all the occurrence trends of FL sites on the Moon, we propose that both the FL and PAN materials were excavated from the primordial lunar crust during ancient basin formations below the megaregolith in the highlands. Since the FL and PAN sites are widely distributed over the lunar surface, our new data may support the existence of a massive PAN layer below the lunar surface.