Massive layer of pure anorthosite on the Moon
Massive layer of pure anorthosite on the Moon
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DOI：
10.1029/2012gl052098
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发表时间：
2012-07
影响因子：
5.2
通讯作者：
S. Yamamoto;R. Nakamura;T. Matsunaga;Y. Ogawa;Y. Ishihara;T. Morota;N. Hirata;M. Ohtake;T. Hiroi;Y. Yokota;J. Haruyama
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作者：
S. Yamamoto;R. Nakamura;T. Matsunaga;Y. Ogawa;Y. Ishihara;T. Morota;N. Hirata;M. Ohtake;T. Hiroi;Y. Yokota;J. Haruyama
我们提出了一个新的全球调查最纯净的斜长岩（PAN）岩石使用光谱剖面仪船上Kaguya。我们发现，PAN岩石在月球上广泛分布，包括长石高地地形和南北两极地区。所有PAN地点都与直径大于100公里的巨大撞击结构有关。根据PAN和富橄榄石地点的全球分布，我们提出在最上层厚度为~ 10 km的富基性混合层下面存在一个厚度为~ 50 km的大质量PAN层。在PAN层之下，月球的近侧可能存在富含橄榄石物质的下地壳层，但远侧却没有。PAN层厚度约为50 km，表明月球地壳中Al2O3丰度为33 ~ 34 wt.%，高于先前估计的<32 wt.%。我们的数据表明，在月球形成的早期，PAN的大规模生产事件支持月球岩浆海洋的假设。
We present a new global survey of the purest anorthosite (PAN) rock using the Spectral Profiler onboard Kaguya. We found that PAN rocks are widely distributed over the Moon, including the Feldspathic Highland Terrain and the south and north polar regions. All PAN sites are associated with huge impact structures with diameters larger than 100 km. Based on the global distributions of PAN and olivine‐rich sites, we propose the existence of a massive PAN layer with a thickness of ∼50 km below an uppermost mafic‐rich mixed layer with a thickness of ∼10 km. Below the PAN layer, a lower crustal layer with olivine‐rich materials may be present on the nearside, but not on the far side of the Moon. The existence of a PAN layer with a thickness of ∼50 km suggests an Al2O3 abundance of 33 to 34 wt.% in the lunar crust, which is higher than previous estimates of <32 wt.%. Our data indicate the massive production event of PAN during the early stage of the formation of the Moon, supporting the lunar magma ocean scenario.