| タイトル | Lunar asymmetry and palaeomagnetism |
| 著者（英） | Stevenson, D. J. |
| 著者所属（英） | California Univ. |
| 発行日 | 1980-10-09 |
| 言語 | eng |
| 内容記述 | A model is proposed for the early lunar evolution which accounts for the compositional asymmetry between the nearside and farside of the moon and the natural remanent magnetism of lunar rocks. According to the model, the preferred gravitational energy state consisted of an asymmetric accumulation of a liquid iron alloy (Fe-Ni and a small amount of sulfur) which displaces upwards the cold primordial undifferentiated core. The resulting depth asymmetry of the outer partially molten zone leads eventually to the subcrustal accumulation of light magnesium-rich pyroxenes and olivine, preferentially in one hemisphere, sufficient to explain the offset and also indirectly providing a possible explanation for the nearside concentration of KREEP and mass basalt. Slow downward migration of iron releases gravitational energy sufficient for convection and dynamo generation in an iron layer for about a billion years. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 80A54066 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/420096 |
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