Abbreviated Journal Title
Geophys. Res. Lett.
METEORITES; MOON; GEOCHEMISTRY; BRECCIA; CRUST; PETROGENESIS; Geosciences, Multidisciplinary
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%.
Geophysical Research Letters
Kiefer, Walter S.; Macke, Robert J.; Britt, Daniel T.; Irving, Anthony J.; and Consolmagno, Guy J., "The density and porosity of lunar rocks" (2012). Faculty Bibliography 2010s. 2858.