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. Author manuscript; available in PMC: 2019 Mar 6.
Published in final edited form as: Rev Mineral Geochem. 2016 Jan 1;81(1):161–238. doi: 10.2138/rmg.2016.81.04

Figure 7.

Figure 7.

MgO regression (a) versus interelement co-variation method (b) for estimating planetary mantle HSE abundances using lunar mare basalts. For MgO regression, a mantle MgO value is assumed and correlations of compatible HSE with MgO are used to regress to a mantle HSE content. In the interelement co-variation method, ratios of the HSE are plotted versus elemental concentration. Where the regression intercepts the chondritic range it is considered to represent the mantle HSE content. Note the large range in Os concentrations and Pt/Os in terrestrial peridotites (data from Becker et al. 2006; Liu et al. 2009 and references therein).