Research ArticleGEOCHEMISTRY

Gallium isotopic evidence for extensive volatile loss from the Moon during its formation

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Science Advances  28 Jul 2017:
Vol. 3, no. 7, e1700571
DOI: 10.1126/sciadv.1700571

Figures

  • Fig. 1 Gallium isotopic compositions for the lunar samples.

    BSE value from Kato et al. (26).

  • Fig. 2 Gallium versus Zn isotopic composition of the lunar samples.

    BSE values are from Kato et al. (26) (Ga) and Chen et al. (46) (Zn). Lunar Zn isotopic values are from Kato et al. (21).

Tables

  • Table 1 Gallium isotopic composition and element concentration of the lunar samples.

    n = number of isotopic measurements.

    Sample typeSample no.δ71Ga (‰)2 SDnGa (ppm)Ga (ppm)*
    Mg-suite
      Cataclastic norite772150.160.0511.5
    Regolith
      Soil782211.160.0512.1
    Pyroclastic glass
      Green glass15426−0.350.0511.34.7
    FANs
      Anorthosite (with melt)62255−0.470.0510.5
      Cataclastic anorthosite600150.170.0511.4
      Ferroan anorthosite154150.850.0511.13.1
      Noritic anorthosite679550.200.0511.93.5–4.2
    Low-Ti basalts
      Basalt (low Ti)154990.090.0523.23
      Olivine basalt120120.320.0221.1
      Olivine basalt120400.150.0531.41.9
      Mare basalt (Al-rich)14053−0.170.0510.82.5–4.8
    High-Ti basalts
      Basalt (high Ti)700170.150.0132.53.1–21
      Basalt (high Ti)100030.350.0621.74.0–4.7
      Basalt (high Ti)701350.570.0222.57–16
      Ilmenite basalt (high K)10057−0.030.0364.8
      Ilmenite basalt (high Mg/Fe)120050.220.0131.1
    BSE0.000.053.9§

    *Data from Meyer (47).

    †Used the 2 SD estimated from Kato et al. (26).

    ‡Data from Kato et al. (26).

    §Data from McDonough (48).

    • Table 2 Ga/Al ratio of the FANs.
      Sample typeSample
      no.
      Ga
      (ppm)
      Al
      (ppm)*
      Ga/Al*104
      (ppm/
      ppm)
      FANs
        Anorthosite
      (with melt)
      622550.51607860.03
        Cataclastic
      anorthosite
      600151.41857760.08
        Ferroan
      anorthosite
      154151.11884400.06
        Noritic
      anorthosite
      679551.91436740.13

      *Data from Meyer (47).

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