Table 7.15. Chemical compositions (wt.%) of average soils at lunar landing sites and in selected regions at the Apollo 15, Apollo 16, Apollo 17, Luna 16, Luna 20, and Luna 24 sites. 11 12 14 15a 15b 15c 15 16a 16b 16c 16 17a 17b 17c 17d 17 L16 L20 L24 SiO2 42.2 46.3 48.1 46.7 46.6 47.1 46.8 45.0 44.9 45.1 45.0 40.6 45.1 43.5 43.7 43.2 41.7 45.1 43.9 TiO2 7.8 3.0 1.7 1.7 1.4 1.0 1.4 0.56 0.47 0.60 0.54 8.4 1.7 3.4 3.5 4.2 3.4 0.55 1.3 Al2O3 13.6 12.9 17.4 13.2 17.1 13.4 14.6 27.1 28.0 26.8 27.3 12.0 20.7 18.0 17.4 17.1 15.3 22.3 12.5 Cr2O3 0.30 0.34 0.23 0.44 0.27 0.37 0.36 0.34 0.54 0.11 0.33 0.45 0.25 0.28 0.32 0.33 0.28 0.32 FeO 15.3 15.1 10.4 16.3 11.7 14.9 14.3 5.2 4.7 5.4 5.1 16.7 8.8 10.9 12.2 12.2 16.7 7.0 19.8 MnO 0.20 0.22 0.14 0.21 0.16 0.19 0.19 0.41 0.27 0.22 0.30 0.23 0.12 0.16 0.16 0.17 0.23 0.13 0.25 MgO 7.8 9.3 9.4 10.9 10.5 13.0 11.5 5.8 5.6 5.7 5.7 9.9 9.8 10.7 11.1 10.4 8.8 9.8 9.4 CaO 11.9 10.7 10.7 10.4 11.6 10.3 10.8 15.8 15.7 15.6 15.7 10.9 12.8 12.12 11.3 11.8 12.5 15.1 12.3 Na2O 47 0.54 0.70 0.38 0.45 0.33 0.39 0.46 0.50 0.43 0.46 0.35 0.42 0.42 0.42 0.40 0.34 0.50 0.31 K2O 0.16 0.31 0.55 0.23 0.20 0.19 0.21 0.13 0.23 0.14 0.17 0.16 0.16 0.12 0.09 0.13 0.10 0.10 0.04 P2O3 0.05 0.4 0.51 0.16 0.19 0.19 0.18 0.13 0.10 0.10 0.11 0.14 0.15 0.09 0.08 0.12 0.12 0.16 0.11 S 0.12 0.07 0.08 0.04 0.06 0.07 0.05 0.09 0.07 0.12 0.09 0.07 0.09 0.09 0.21 0.08 0.14 Total 99.9 99.6 99.8 100.6 100.2 100.9 100.8 100.9 100.9 100.4 100.8 100.1 100.0 99.8 99.9 100.5 99.7 100.8 100.4 ppm Sc 60 38 23 30 22 24 25.3 9.0 8.0 9.0 8.7 63 17 31 37 37 37 16 34 U 0.5 1.7 1.5 1.3 0.9 0.73 0.53 0.45 0.61 0.53 0.29 0.90 0.44 0.41 0.25 0.29 0.26 Th 1.9 6.4 6.7 3.8 3.0 2.3 1.9 1.4 2.8 2.0 0.53 2.7 2.7 1.5 1.9 0.8 0.85 1.1 La 16 39 70 23 32 24 26.3 11 8 13 10.7 8 15 11 8.5 13 5 5 11 Composition of soil 10002 from Apoll 11 site. 12 Average composition of selected soils (12001, 12023, 12030, 12032, 12033, 12037, 12041, 12042, 12044, 12070) from the Apollo 12 site. 14 Average composition of selected soils (14003, 14148, 14149, 14156) from the Apollo 14 site. 15a Average composition of selected mare soils (15012, 15013, 15020, 15030, 15040, 15070, 15080, 15470, 15500, 15530, 15600) from the Apollo 15 site. 15b Average composition of selected Apennine Front soils (15090, 15100, 15210, 15221, 15230, 15250, 15270, 15290) from the Apollo 15 site. 15c Average composition of selected green-glass-rich soils (15300, 15400, 15410, 15403) from the Apollo 15 site. 15 Average composition of Apollo 15 soils. 16a Average composition of Cayley Plain soil (60050, 60500, 61140, 61161, 61180, 61220, 61240, 61500, 62240, 62280) from the Apollo 16 site. 16b Average composition of selected North Ray soils (63320, 63340, 63500, 67460, 67480, 67600, 67700, 67710, 68500, 68820, 69920, 69940) from the Apollo 16 site. 16c Average composition of selected Stone Mountain and South Ray soils (64420, 64500, 64800, 65500, 65700, 66040, 66080) from the Apollo 16 site. 16 Average composition of Apollo 16 soils. 17a Average composition of selected mare soils (70011, 70160, 70180, 71040, 71060, 71500, 72160, 75060, 75080, 79220, 79240) from the Apollo 17 site. 17b Average composition of selected South Massif and light mantle soils (72320, 72440, 72460, 72500, 73120, 73140, 73220, 73280, 74120) from the Apollo 17 site. 17c Average composition of selected North Massif soils (76246, 76260, 76280, 76320, 76500, 77530) from the Apollo 17 site. 17d Average composition of selected Sculptured Hill soils (78220, 78420, 78440, 78460, 78480) from the Apollo 17 site. 17 Average composition of Apollo 17 soils. L16 Average composition of Luna 16 soils (Russian data). L20 Average composition of Luna 20 soils (Russian data; Sc from Laul and Papike, 1980). L24 Average composition of Luna 24 soils (Russian data). Data Source: Baedecker et al. (1974); Bansal et al. (1972); Boynton et al. (1975, 1976a); Brunfelt et al. (1972a,b; 1973a,b); Carron et al. (1972); Christian et al. (1976); Compston et al. (1973); Cuttitta et al. (1971); Duncan et al. (1973, 1975); Finkelman et al. (1975); Frondel et al. (1971); Fruchter et al. (1974a,b); Goles et al. (1971); Haskin et al. (1971, 1973); Korotev (1976, 1981, 1982); Krahenbuhl et al. (1973); Laul and Papike (1980); Laul and Schmitt (1973b); Laul et al. (1972, 1974); Lindstrom et al. (1972); LSPET (1972, 1973a,b); Mason et al. (1973); Masuda et al. (1972); Miller et al. (1974); Morgan et al. (1972); Philpotts et al. (1972, 1974); Rhodes et al. (1974); Rose et al. (1972, 1973, 1974, 1975); Schnetzler and Philpotts (1971); Simkin et al. (1973); Tarasov et al. (1977); Taylor et al. (1973); Vinogradov et al. (1973); Wakita et al. (1971); Wanke et al. (1973, 1974, 1975); Warren et al. (1978); Willis et al. (1972); Woodcock and Pillinger (1978)