Extended Data Fig. 7: Sm/Yb versus La plot for mare basalts and Apollo 17 volcanic glass.
From: Ultra-depleted mantle source of basalts from the South Pole–Aitken basin
a, Modelling of the deviation from a garnet-bearing mantle source. The dashed lines denote the melts produced by partial melting of the mantle source (78 PCS + 0.6% TIRL; PCS, percent crystallized solid; TIRL, trapped instantaneous residual liquid) with various proportions of garnet retained in the residue. The CE6 basalt exhibits high Sm/Yb ratios, which require 0.8% garnet retained in the mantle residue. b, Modelling of the deviation from a high Sm/Yb ratio mantle source. The purple lines denote the melts produced by partial melting of the high Sm/Yb ratio mantle source (78 PCS + 0.8% high-Ti component). The high Sm/Yb ratio of the CE6 basalt can also be reproduced by partial melting of a high Sm/Yb ratio mantle source. The Apollo mare basalt data are from the mare basalt database of Clive Neal (https://www3.nd.edu/~cneal/Lunar-L/). The Apollo 17 volcanic glass data are from ref. 69.
