Table 10 in The Tumbarumba Basaltic Gem Field, New South Wales: In Relation to Sapphire-Ruby Deposits of Eastern Australia

Table 10. Modal mineralogy and melting proportions of mantle types. mantleOlivineOpxCpxGarnetSpinelKaersutitePhlogopiteSpinel lherzolitemode58.0625.9612.453.53melt prop0.337.6472.9019.13SD0.305.104.850.49Garnet lherzolitemode59.8021.107.6011.50melt prop0.217.5929.6462.56SD0.194.904.301.64Spinelmode59.2724.908.682.145.02amphibolemelt prop1.0814.3617.433.2363.90lherzolite (a)SD1.165.625.872.718.21Garnetmode59.7020.226.469.534.09amphibolemelt prop3.7414.3628.9243.233.74lherzolite (a)SD0.665.620.611.060.66Garnetmode65.6624.233.472.184.47amphibolemelt prop1.596.8613.6824.3753.50lherzolite (b)SD1.062.052.534.663.62Spinelmode58.1825.1812.333.271.05phlogopitemelt prop11.0013.1752.4212.9710.44lherzoliteSD15.5218.5924.983.345.78Garnetmode60.2916.949.785.987.00phlogopitemelt prop1.143.0825.5513.3656.87lherzolite (a)SD0.756.379.6818.9031.05Garnetmode65.3522.365.235.651.42phlogopitemelt prop0.890.8926.1968.333.71lherzolite (b)SD0.580.583.224.894.82 Modal mineralogy of each mantle type is calculated using major element mass balance and also given are the melting proportions (and their standard deviations) which produce the degrees of partial melting listed in Table 11. All values in wt%. All mineral compositions are from McKenzie & O’Nions (1991), except that for amphibole, which is an average value for kaersutite xenocrysts from this study and those used in models GAL (b) and GPL (b), which are from Comin-Chiaramonti et al. (1997). In most models, the bulk mantle composition used is that of the bulk Earth (McKenzie & O’Nions, 1991). The only exceptions are models GAP(b) and GPP(b), which are based on an analysis of a garnet-phlogopite xenolith (Comin-Chiaramonti et al., 1997). Suffix (a) stands for mantle based on the bulk Earth composition given by McKenzie & O’Nions (1991); and (b) for mantle compositions based on a garnet-phlogopite lherzolite from Comin-Chiaramonti et al. (1997).