月球表层及月壳物质密度分布特征

发布时间：2018-01-17 01:17

本文关键词：月球表层及月壳物质密度分布特征　出处：《地球物理学报》2010年09期 　论文类型：期刊论文

【摘要】：月球表层与月壳岩石密度的横向与径向的变化,反映了月表及内部成分以及月球演化等特征.本文利用月球勘探者号伽马射线谱仪探测的月表Fe,Th与Mg元素分布数据,依据前人给出的元素含量与岩石类型的关系,对月球表层进行了岩性填图,并结合岩石样品与陨石的密度测试数据建立初始密度模型,采用铁元素与岩石密度的关系对其进行修正,从而建立了月表物质密度分布模型.基于嫦娥一号激光测高数据和日本SELENE计划发布的月球重力模型,计算出月球布格重力异常,进而反演得到月壳0～40 km深度范围内岩石平均密度分布模型.分析表明,大部分区域上,月壳至少月壳上部岩石成分主要以轻质的富含铝、钙、镁质的硅酸盐类岩石为主.由此推测,原始月壳极有可能是由轻质的、富含钙、镁质硅酸盐类岩石构成的全球性月壳.现今的玄武岩与克里普岩只是覆盖于原始的月壳之上的岩层,且厚度不大.
[Abstract]:The lateral and radial variations of the density of the lunar surface and lunar crust rocks reflect the characteristics of the lunar surface and internal composition as well as the evolution of the moon. In this paper, the lunar surface Fe detected by the Lunar Prospector Gamma Ray Spectrometer is used. Based on the distribution data of Th and mg elements and the relationship between element content and rock type, lithologic mapping of lunar surface is carried out. The initial density model was established based on the density data of rock samples and meteorites, and the relationship between iron element and rock density was modified. The lunar surface mass density distribution model is established and the lunar gravity anomaly is calculated based on the Chang 'e-1 laser altimetry data and the lunar gravity model released by SELENE of Japan. The average density distribution model of rocks in the depth of 40 km from the lunar crust is obtained. The analysis shows that in most regions, the composition of rocks in the upper part of the lunar crust at least is mainly rich in aluminum and calcium. Magnesian silicate rocks are predominant. It is inferred that the primordial lunar crust is probably light and rich in calcium. A global lunar crust formed by magnesite silicate rocks. Today's basalts and krippites are only strata that cover the original lunar crust and are not very thick.
【作者单位】：中国地质大学地球物理与空间信息学院;
【基金】：国家自然科学基金项目(40774060)资助
【分类号】：P184.5
【正文快照】： 1引言 Apollo与月球勘探者号(Lunar prospeCtor,LP)伽马谱数据仁‘一3〕与嫦娥一号y射线谱仪、X射线谱仪和干涉成像光谱仪川获得的月表多种元素分布表明:月球表面的化学元素分布极不均一Berezhnoy等仁5〕利用月表元素丰度资料对月球表面岩性进行分类“填图”,他们认为月球高

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