Sample 72431
Soil 79.5 grams
Section titled “Soil 79.5 grams”
Figure 1: Map for station 2, Apollo 17.
Introduction
Section titled “Introduction”72430 is the soil scooped up when 72435 was picked up from the regolith after it was chipped from the boulder and it was returned in the same bag.. It has exactly the same composition as the regolith from beneath the boulder (74240, 74260).
Petrography
Section titled “Petrography”Morris (1978) determined the maturity index (Is /FeO =63). Meyer (1973) cataloged the coarse-fines.
Chemistry
Section titled “Chemistry”Korotev and Kremser (1992) determined the chemical composition by neutron activation analysis (table).
Figure 2: FeO content of 72431 compared with that of other Apollo soil samples.
Figure 3: Normalized rare-earth-element diagram for 72431.
Table 1. Chemical composition of 72431.
| weight SiO2 % TiO2 | reference Korotev92 | ||
|---|---|---|---|
| Al2O3 FeO MnO MgO | 8.92 | 8.55 | (a) |
| CaO Na2O K2O P2O5 S % sum | 0.464 | 0.464 | (a) |
| Sc ppm | 19.6 | 18.6 | (a) |
| V Cr Co Ni Cu Zn Ga Ge ppb As Se Rb | 1620 28.9 242 | 1509 25.6 222 | (a) (a) (a) |
| Sr | 158 | 159 | (a) |
| Y Zr Nb Mo Ru Rh Pd ppb Ag ppb Cd ppb In ppb Sn ppb Sb ppb | 270 | 240 | (a) |
| Te ppb Cs ppm Ba La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W ppb Re ppb | 209 17.3 46 | 196 18.2 47.9 | (a) (a) (a) |
| 30 8.4 1.36 | 30 8.65 1.35 | (a) (a) (a) | |
| 1.62 | 1.68 | (a) | |
| 6.26 0.857 6.75 0.83 | 6.5 0.894 6.69 0.82 | (a) (a) (a) (a) | |
| Os ppb Ir ppb | 8.3 | 6.7 | (a) |
| Pt ppb Au ppb Th ppm U ppm technique: (a) INAA | 2.9 2.9 0.75 | 4.6 3.3 0.78 | (a) (a) (a) |
References for 72431
Section titled “References for 72431”Butler P. (1973) Lunar Sample Information Catalog Apollo 17. Lunar Receiving Laboratory. MSC 03211 Curator’s Catalog. pp. 447.
Heiken G.H. (1974) A catalog of lunar soils. JSC Curator
Heiken G.H. (1975) Petrology of lunar soils. Rev. Geophys. Space Phys. 13, 567-587.
Korotev R.L. and Kremser D. (1992) Compositional variations in Apollo 17 soils and their relationships to the geology of the Taurus-Littrow site. Proc. 22nd Lunar Planet. Sci. Conf. 275-301.
LSPET (1973a) Apollo 17 lunar samples : Chemical and petrographic description. Science 182, 659-690.
LSPET (1973c) Preliminary examination of lunar samples. Apollo 17 Preliminary Science Report. NASA SP-330, 7- 1—7-46.
Meyer C. (1973) Apollo 17 Coarse Fines (4-10 mm) Sample Location, Classification and Photo Index. Curator Report. pp. 182.
Mitchell J.K., Carrier W.D., Costes N.C., Houston W.N., Scott R.F. and Hovland H.J. (1973) 8. Soil-Mechanics. In Apollo 17 Preliminary Science Rpt. NASA SP-330. pages 8-1-22.
Morris R.V., Score R., Dardano C. and Heiken G. (1983) Handbook of Lunar Soils. Two Parts. JSC 19069. Curator’s Office, Houston
Morris R.V. (1978) The surface exposure (maturity) of lunar soils: Some concepts and Is/FeO compilation. Proc. 9th Lunar Sci. Conf. 2287-2297.
Morris R.V. (1980) Origins and size distribution of metallic iron particles in the lunar regolith. Proc. 11th Lunar Planet. Sci. Conf. 1697-1712.
Papike J.J., Simon S.B. and Laul J.C. (1982) The lunar regolith: Chemistry, Mineralogy and Petrology. Rev. Geophys. Space Phys. 20, 761-826.
Wolfe E.W., Bailey N.G., Lucchitta B.K., Muehlberger W.R., Scott D.H., Sutton R.L and Wilshire H.G. (1981) The geologic investigation of the Taurus-Littrow Valley: Apollo 17 Landing Site. US Geol. Survey Prof. Paper, 1080, pp. 280.