Fig. 5: (40Ar/36Ar)m ratios plotted versus the 36Ar concentrations in CE-5 soil.
From: Weak influence of the secondary surface processes on the regolith of Chang’E-5 landing site
a (40Ar/36Ar)m ratios in different minerals and soil with different grain sizes. Different minerals have similar 36Ar concentrations, and the grain size negatively correlates with the 36Ar concentration. b (40Ar/36Ar)m ratios in groups with single (several) grain(s). Note that each group has two symbols representing the grain weight, which is related to the 36Ar concentration and is calculated by the two end-densities of the mineral, respectively. The 40Ar/36Ar ratios of the single (several) pyroxene/olivine grain(s) are close to the corrected (40Ar/36Ar)tr ratios of the bulk soil, as they have negligible radiogenic 40Ar because of the extremely low K content. Analytical uncertainties of the 40Ar/36Ar ratio of the bulk sample are at 1σ. The uncertainties of the 36Ar concentration of the single (several) pyroxene/olivine grain(s) mainly resulted from the uncertainty of the mineral density and uncertainty of grain volume determination (see details in the “Methods” section).
