The density and porosity of lunar rocks
The density and porosity of lunar rocks
复制标题
DOI：
10.1029/2012gl051319
复制
发表时间：
2012-04-13
影响因子：
5.2
通讯作者：
Consolmagno, Guy J.
中科院分区：
文献类型：
--
作者：
Kiefer, Walter S.;Macke, Robert J.;Consolmagno, Guy J.
精确的月球岩石密度对于建立月球地壳和岩石圈的重力模型是必要的。大多数阿波罗时代的密度测量有2-5%或更多的误差，很少包括孔隙度测量。我们报告了用珠法和氦比重计对6个阿波罗样品和7个月球陨石进行的密度和孔隙度测量的新结果，典型的颗粒密度不确定度为10-30 kg m（-3）（0.3-0.9%），孔隙度不确定度为1- 3%。火成岩颗粒密度和标准矿物密度之间的比较表明，这些不确定性是现实的，氦完全渗透到孔隙空间。玄武岩的颗粒密度是组成的强函数，至少在3270 kg m（-3）（高铝玄武岩）到3460 kg m（-3）（高钛玄武岩）之间变化。长石质高地地壳的体积密度为2200 - 2600 kg m（-3），孔隙率为10- 20%。撞击盆地喷出物的体积密度为2350-2600 kg m（-3），孔隙率约为20%。引文：基弗，W.美国，R. J. Macke，D. T.布里特，A. J.欧文和G. J. Consolmagno（2012），月球岩石的密度和孔隙度，地球物理学。保留信函：39，L07201，doi：10.1029/2012GL051319。
Accurate lunar rock densities are necessary for constructing gravity models of the Moon's crust and lithosphere. Most Apollo-era density measurements have errors of 2-5% or more and few include porosity measurements. We report new density and porosity measurements using the bead method and helium pycnometry for 6 Apollo samples and 7 lunar meteorites, with typical grain density uncertainties of 10-30 kg m(-3) (0.3-0.9%) and porosity uncertainties of 1-3%. Comparison between igneous grain densities and normative mineral densities show that these uncertainties are realistic and that the helium fully penetrates the pore space. Basalt grain densities are a strong function of composition, varying over at least 3270 kg m(-3) (high aluminum basalt) to 3460 kg m(-3) (high titanium basalt). Feldspathic highland crust has a bulk density of 22002600 kg m(-3) and porosity of 10-20%. Impact basin ejecta has a bulk density of 2350-2600 kg m(-3) and porosity of similar to 20%. Citation: Kiefer, W. S., R. J. Macke, D. T. Britt, A. J. Irving, and G. J. Consolmagno (2012), The density and porosity of lunar rocks, Geophys. Res. Lett., 39, L07201, doi: 10.1029/2012GL051319.