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Earth, Planets and Space

Table 1 Chemical composition of plagioclase-rich lithic fragments separated from Apollo 17, 78461 regolith

From: 40Ar/39Ar and cosmic ray exposure ages of plagioclase-rich lithic fragments from Apollo 17 regolith, 78461

Sample Weight (mg) SiO2 (wt.%) TiO2 Al2O3 FeO MgO CaO Na2O K2O Fe/(Fe + Mg) Σ An(%)
Plag#1 0.22 44.34 0.00 35.68 0.01 0.05 19.25 0.53 0.10 0.19 99.96 93.6
Plag#3 0.17 44.28 0.01 36.18 0.03 0.03 18.78 0.64 0.03 0.54 99.98 94.0
Plag#6 0.06 45.01 0.00 35.97 0.04 0.05 18.20 0.62 0.10 0.48 99.99 93.6
Plag#9 0.20 44.47 0.01 35.50 0.02 0.02 19.07 0.75 0.11 0.54 99.95 92.8
Plag#10 0.16 43.98 0.01 35.97 0.08 0.07 19.40 0.55 0.03 0.57 100.09 95.0
Plag#14 0.18 44.45 0.00 35.43 0.07 0.03 19.25 0.68 0.02 0.73 99.93 94.4
Plag#21 1.20 44.29 0.01 35.90 0.05 0.08 19.02 0.59 0.05 0.42 99.99 95.0
Plag#22 0.52 44.11 0.08 34.49 0.82 0.50 19.02 0.38 0.28 0.66 99.68 96.5
Plag#23 1.08 43.25 0.01 36.16 0.21 0.07 19.86 0.37 0.05 0.78 99.98 93.2
Plag#24 0.72 44.19 0.03 35.71 0.27 0.06 18.89 0.66 0.16 0.84 99.97 95.3
Plag#25 0.45 43.78 0.04 35.52 0.35 0.21 19.53 0.48 0.07 0.66 99.98 95.3
  1. Values of major element oxides are average of three analyses. Percentage fraction of anorthite in plagioclase feldspar is indicated (An%)
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