期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 6, 页码 1882-1889出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059378
关键词
lunar crust; GRAIL gravity; LOLA topography; density; porosity
资金
- NASA
The Gravity Recovery and Interior Laboratory (GRAIL) mission is providing unprecedentedly high-resolution gravity data. The gravity signal in relation to topography decreases from 100 km to 30 km wavelength, equivalent to a uniform crustal density of 2450 kg/m(3) that is 100 kg/m(3) smaller than the density required at 100 km. To explain such frequency-dependent behavior, we introduce rock compaction models under lithostatic pressure that yield radially stratified porosity (and thus density) and examine the depth extent of porosity. Our modeling and analysis support the assertion that the crustal density must vary from surface to deep crust by up to 500 kg/m(3). We found that the surface density of megaregolith is around 2400 kg/m(3) with an initial porosity of 10-20%, and this porosity is eliminated at 10-20 km depth due to lithostatic overburden pressure. Our stratified density models provide improved fits to both GRAIL primary and extended mission data. Key Points Density and porosity structure within the lunar crust was quantified The porosity is eliminated at 10-20 km depth due to lithostatic pressure Improved lunar crustal gravity models were constructed
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据