Author Affiliations
1Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China2State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China3CAS Center for Excellence in Comparative Planetology, Hefei 230026, Chinashow less
Fig. 1. Backscattered electron (BSE) image of the seifertite- and stishovite-bearing silica fragment in CE-5 regolith sample 01GP. The phase in the smooth area around the seifertite, stishovite, and α-cristobalite-like phases is amorphous silica. Sft, seifertite; Sti, stishovite; α-Crs-like, α-cristobalite-like. Reproduced with permission from Pang et al., “New occurrence of seifertite and stishovite in Chang’E-5 regolith,” Geophys. Res. Lett. 49(12), e2022GL098722 (2022). Copyright 2022 John Wiley & Sons.
Fig. 2. BSE images showing the tweed-like texture of the silica fragment in Fig. 1. The white dashed lines represent the orientations of the amorphous silica lamellae. Sft, seifertite; Sti, stishovite; α-Crs-like, α-cristobalite-like. Reproduced with permission from Pang et al., “New occurrence of seifertite and stishovite in Chang’E-5 regolith,” Geophys. Res. Lett. 49(12), e2022GL098722 (2022). Copyright 2022 John Wiley & Sons.
Fig. 3. Y+REE vs other cations in changesite-(Y), expressed as cations per 56 O atoms. Data are listed in Table I. (a) Y+REE vs Ca; the regression equation is for the line shown, fitted to the changesite-(Y) grains in CE-5 sample 01GP. (b) Y+REE vs Na, Si, and Mg,Fe-site atoms in changesite-(Y). Mg,Fe-site atoms include Mg, Fe, and Mn.
Fig. 4. BSE images of changesite-(Y) in basalt fragments from CE-5 regolith sample 01GP. Fa, fayalite; Px, pyroxene; Pl, plagioclase; Crs, cristobalite; Bdy, baddeleyite; Tro, troilite.
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P2O5 | 42.85 | 42.74 | 42.43 | 40.17 | 39.08 | 38.9 | 41.7 | 40.6 | 41.1 | 42.5 | 40.7 | 40.2 | 39.7 | 41.0 | 41.2 | 41.2 | 40.0 | SiO2 | 0.14 | 0.28 | 1.36 | 4.02 | 7.61 | 6.27 | 0.35 | 1.76 | 0.75 | 0.34 | 1.42 | 1.23 | 1.55 | 0.48 | 0.50 | 0.56 | 0.90 | TiO2 | 0.02 | 0.05 | 0.03 | n.a. | n.a. | n.a. | n.a. | n.a. | 0.04 | 0.06 | 0.05 | 0.02 | 0.06 | b.d. | 0.02 | 0.03 | 0.04 | Al2O3 | 0.07 | 0.08 | 0.20 | n.a. | n.a. | n.a. | n.a. | n.a. | 0.08 | 0.04 | 0.47 | b.d. | 0.07 | b.d. | b.d. | b.d. | 0.02 | FeO | 6.32 | 6.46 | 6.23 | 6.10 | 6.04 | 6.03 | 6.59 | 7.77 | 6.77 | 6.77 | 7.25 | 6.33 | 6.49 | 6.06 | 6.03 | 6.23 | 6.13 | MnO | 0.11 | 0.09 | 0.06 | 0.06 | 0.05 | 0.07 | 0.07 | 0.11 | 0.04 | 0.06 | 0.05 | 0.06 | 0.06 | 0.05 | 0.05 | 0.06 | 0.06 | MgO | 0.33 | 0.33 | 0.32 | 0.15 | 0.10 | 0.11 | b.d. | 0.03 | 0.35 | 0.30 | 0.35 | 0.06 | 0.05 | 0.02 | b.d. | 0.05 | b.d. | CaO | 40.76 | 41.02 | 40.76 | 38.09 | 37.28 | 38.0 | 37.9 | 37.5 | 38.6 | 41.6 | 38.4 | 36.9 | 37.4 | 38.1 | 37.7 | 37.4 | 37.3 | BaO | 0.03 | 0.04 | b.d. | n.a. | n.a. | n.a. | n.a. | n.a. | 0.03 | b.d. | b.d. | b.d. | b.d. | 0.02 | b.d. | b.d. | 0.03 | Na2O | 0.32 | 0.48 | 0.36 | 0.18 | 0.10 | 0.14 | 0.02 | 0.12 | 0.10 | 0.37 | 0.24 | 0.04 | 0.02 | 0.06 | 0.06 | b.d. | b.d. | K2O | 0.15 | 0.18 | 0.28 | n.a. | n.a. | n.a. | n.a. | n.a. | 0.02 | 0.04 | 0.03 | 0.04 | 0.09 | 0.04 | 0.06 | 0.04 | 0.05 | Y2O3 | 1.68 | 1.45 | 1.59 | 2.21 | 2.00 | 2.19 | 2.76 | 2.62 | 2.74 | 1.45 | 2.02 | 2.96 | 2.76 | 2.45 | 2.41 | 2.12 | 2.44 | La2O3 | 0.89 | 0.74 | 0.76 | 1.18 | 1.09 | 1.09 | 1.42 | 1.27 | 1.27 | 0.69 | 0.97 | 1.98 | 2.00 | 1.80 | 1.80 | 2.26 | 2.19 | Ce2O3 | 2.14 | 1.92 | 1.89 | 2.86 | 2.66 | 2.59 | 3.46 | 3.28 | 2.98 | 1.75 | 2.47 | 4.41 | 4.42 | 4.30 | 4.18 | 4.77 | 4.79 | Pr2O3 | 0.280 | 0.189 | 0.239 | 0.341 | 0.286 | 0.244 | 0.424 | 0.310 | 0.343 | 0.258 | 0.302 | 0.577 | 0.634 | 0.581 | 0.557 | 0.499 | 0.550 | Nd2O3 | 1.308 | 1.066 | 1.257 | 1.682 | 1.582 | 1.502 | 2.052 | 1.925 | 1.985 | 1.124 | 1.591 | 2.508 | 2.282 | 2.420 | 2.438 | 2.386 | 2.384 | Sm2O3 | 0.301 | 0.274 | 0.272 | n.a. | n.a. | n.a. | n.a. | n.a. | 0.489 | 0.315 | 0.374 | 0.578 | 0.585 | 0.563 | 0.594 | 0.540 | 0.553 | Gd2O3 | 0.459 | 0.500 | 0.373 | 0.636 | 0.585 | 0.623 | 0.828 | 0.766 | 0.783 | 0.287 | 0.516 | 0.791 | 0.660 | 0.737 | 0.731 | 0.507 | 0.779 | Dy2O3 | 0.420 | 0.295 | 0.301 | 0.536 | 0.445 | 0.558 | 0.632 | 0.535 | 0.547 | 0.271 | 0.350 | 0.659 | 0.444 | 0.413 | 0.428 | 0.346 | 0.647 | Total | 98.6 | 98.2 | 98.7 | 98.2 | 98.9 | 98.3 | 98.2 | 98.6 | 99.2 | 98.3 | 97.8 | 99.4 | 99.4 | 99.0 | 98.8 | 99.0 | 98.9 | (Y+REE)2O3 | 7.47 | 6.43 | 6.68 | 9.45 | 8.65 | 8.79 | 11.57 | 10.71 | 11.14 | 6.14 | 8.59 | 14.46 | 13.79 | 13.27 | 13.14 | 13.43 | 14.32 | P | 13.96 | 13.92 | 13.70 | 13.13 | 12.49 | 12.61 | 13.91 | 13.48 | 13.68 | 13.86 | 13.57 | 13.50 | 13.33 | 13.73 | 13.81 | 13.80 | 13.55 | Si | 0.055 | 0.108 | 0.520 | 1.553 | 2.873 | 2.399 | 0.137 | 0.690 | 0.293 | 0.132 | 0.560 | 0.488 | 0.614 | 0.191 | 0.197 | 0.222 | 0.360 | Sum (P,Si) | 14.02 | 14.03 | 14.22 | 14.68 | 15.36 | 15.01 | 14.05 | 14.17 | 13.97 | 14.00 | 14.13 | 13.98 | 13.95 | 13.92 | 14.01 | 14.02 | 13.91 | Ti | 0.005 | 0.014 | 0.007 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.013 | 0.018 | 0.015 | 0.007 | 0.017 | 0.000 | 0.005 | 0.008 | 0.011 | Al | 0.029 | 0.034 | 0.088 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.039 | 0.020 | 0.216 | 0.006 | 0.032 | 0.003 | 0.005 | 0.007 | 0.009 | Fe | 2.035 | 2.077 | 1.986 | 1.969 | 1.908 | 1.931 | 2.171 | 2.549 | 2.225 | 2.184 | 2.389 | 2.100 | 2.150 | 2.005 | 1.996 | 2.062 | 2.048 | Mn | 0.035 | 0.028 | 0.020 | 0.019 | 0.017 | 0.023 | 0.023 | 0.036 | 0.013 | 0.021 | 0.015 | 0.018 | 0.020 | 0.016 | 0.018 | 0.020 | 0.020 | Mg | 0.187 | 0.188 | 0.184 | 0.084 | 0.055 | 0.062 | 0.000 | 0.017 | 0.203 | 0.174 | 0.205 | 0.033 | 0.031 | 0.014 | 0.000 | 0.032 | 0.008 | Ca | 16.81 | 16.91 | 16.65 | 15.76 | 15.07 | 15.58 | 16.02 | 15.75 | 16.24 | 17.17 | 16.18 | 15.69 | 15.91 | 16.15 | 15.97 | 15.86 | 15.98 | Ba | 0.004 | 0.005 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.004 | 0.000 | 0.000 | 0.000 | 0.000 | 0.003 | 0.000 | 0.000 | 0.004 | Na | 0.238 | 0.357 | 0.268 | 0.135 | 0.072 | 0.100 | 0.014 | 0.090 | 0.073 | 0.279 | 0.186 | 0.034 | 0.012 | 0.042 | 0.042 | 0.000 | 0.000 | K | 0.075 | 0.087 | 0.135 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.012 | 0.022 | 0.017 | 0.021 | 0.045 | 0.022 | 0.030 | 0.018 | 0.026 | Y+REE | 1.14 | 0.98 | 1.02 | 1.45 | 1.30 | 1.35 | 1.82 | 1.68 | 1.75 | 0.95 | 1.35 | 2.26 | 2.15 | 2.06 | 2.03 | 2.06 | 2.22 | Sum of | 20.56 | 20.68 | 20.36 | 19.42 | 18.43 | 19.05 | 20.05 | 20.12 | 20.58 | 20.83 | 20.57 | 20.17 | 20.37 | 20.31 | 20.10 | 20.07 | 20.33 | cations | | | | | | | | | | | | | | | | | |
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Table 1. Changesite-(Y) compositions in CE-5 regolith sample 01GP.a