Sample 15501
15501, 15511 and 15531
Section titled “15501, 15511 and 15531”Soils 140, 275.8 and 291.7grams
Figure 1: Tele-photo of edge of Hadley Rille where 15531 was taken. 15501 and 15511 were from the foreground. AS15-82-11126.
15501
15531
Modal content of soil 15501 and 15531.
Section titled “Modal content of soil 15501 and 15531.”From Basu et al. 1981.
| Agglutinates | 35.1% | 23.7 |
|---|---|---|
| Mare Basalt | 7.7 | 15.8 |
| KREEP basalt | 1.3 | 0.8 |
| Breccia | 13.1 | 3.9 |
| Anorthosite | 0.4 | 0.1 |
| Norite | ||
| Gabbro | 0.3 | 0.6 |
| Plagioclase | 6.6 | 7.2 |
| Pyroxene | 18.6 | 30.1 |
| Olivine | 2.7 | 5.3 |
| Ilmenite | 0.3 | 0.9 |
| Glass other | 11.3 | 7.1 |
| From Carr and Meyer 1974 | ||
| Agglutinates | 56.9% | 25.6 |
| Basalt | 6.9 | 22.4 |
| Breccia | 1.6 | 0.6 |
| Plagioclase | 6 | 8 |
| Pyroxene | 16 | 34.9 |
| Olivine | 2.6 | 1.2 |
| Ilmenite | 0.2 | 0.6 |
| Glass other | 9.8 | 6.7 |
Figure 2: Chemical composition of 15501 and 15531 compared with that of other Apollo soils.
Figure 3: Maturity index and carbon content of 15501.
Introduction
Section titled “Introduction”15501 and 15511 were collected from the rim of a small crater at station 9, while 15531 was collected at station 9a (near Hadley Rille). 15501 is the < 1 mm soil that came with 15505 (a large breccia), 15511 is the soil that came with the rake sample (15515 etc.), and double drive tube 15011/10 was collected near 15531 and 15600 (rake).
Petrography
Section titled “Petrography”The maturity index (Is /FeO) of 15501 is 51 (submature) and that of 15531 is 27 (immature) (Morris 1978). Carr and Meyer (1974) and Basu et al. (1981) determined the mineralogic mode for 15501 and 15531. There were ~57% agglutinates in 15501 while 15531, from near the Rille, only had about 25% agglutinates.
Powell (1972) and Ryder and Sherman (1989) cataloged the coarse-fines.
Chemistry
Section titled “Chemistry”The chemical composition is plotted in figures 2 and 4.
The carbon content of 15501 is 110 or 130 ppm (Cadogen 1972 or Moore et al. 1973)(figure 3).
Walker and Papike (1981) calcultated that 15501 – 15511 was composed of about 60 % mare basalt, 20 % KREEP and 5 % grenn glass.
Radiogenic age dating
Section titled “Radiogenic age dating”Alexander et al. (1976) produced an isochron (figure 6), but it has no real meaning.
Cosmogenic isotopes and exposure ages
Section titled “Cosmogenic isotopes and exposure ages”Rancitelli et al. (1972) determined the cosmic-rayinduced activity of 22Na = 62 dpm/kg, 26Al = 74 dpm/ kg and 46Sc = 7 dpm/kg.
Average grain size = 69 microns
Section titled “Average grain size = 69 microns”
Figure 5a: Grain size distribution of 15500 (Graf 1993).
Figure 4: Normalized rare-earth-element diagrams for 15501 and 15531 (Korotev 1987).
Processing
Section titled “Processing”15500, 15510 and 15530 were returned in a sample collection bag (#7) placed in ALSRC#2 (which did not seal).
Average grain size = 102 microns
Figure 5b: Grain size distribution of 15530 (Graf 1993).
Table 1. Chemical composition of 15501.
| reference LSPET72 weight | Laul72 | Morgan72 Ganapathy73 46.6 g | Rancitelli72 | Chou74 | Duncan75 | Korotev87 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SiO2 % TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O P2O5 S % sum | 46.21 1.81 12.2 16.72 0.22 10.8 10.25 0.37 0.16 0.17 0.07 | (a) (a) (a) (a) | (a) 1.6 (a) 12.7 (a) 16.5 (a) 0.207 (a) 10 (a) 0.377 (a) 0.17 | (b) (b) (b) (b) (b) (b) (b) | 0.15 | (d) | 13.2 16.7 0.22 10.4 0.38 0.17 | 46.46 1.78 (b) 12.54 (b) 16.61 (b) 0.212 10.98 (b) 10.31 (b) 0.36 0.158 (b) 0.184 0.08 | (a) (a) (a) (a) | (a) 1.78 (a) 12.5 (a) 16.8 (a) 0.21 (a) 11 (a) 9.8 (a) 0.37 | (b) (b) (b) (b) (b) (b) (b) | |||
| Sc ppm V Cr Co Ni Cu Zn Ga Ge ppb As | 3353 | 31 139 (a) 2942 43 | (b) (b) (b) | 43.6 (b) 150 14 317 | (c ) (c ) (c ) (c ) | 34 220 50 238 13.7 4.46 303 | (b) (c ) (c ) | (b) 129 3134 (b) 50 (c ) 224 3 (c ) 13 | (a) (a) (a) | 32.9 (a) 3000 (a) 48.5 (a) 201 | (b) (b) (b) (b) | |||
| Se Rb Sr Y Zr Nb Mo Ru Rh | 4.7 122 72 317 | (a) (a) (a) | (a) 370 | (b) | 4.18 | (c ) | 4.8 115 67.9 312 19.5 | (a) (a) (a) | (a) 120 (a) 330 | (b) (b) | ||||
| Pd ppb Ag ppb Cd ppb In ppb Sn ppb | 30.7 36 7.4 | (c ) (c ) (c ) | 45 35 | (c ) (c ) | ||||||||||
| Sb ppb Te ppb Cs ppm Ba La Ce Pr | 120 20 53 | (b) (b) (b) | 1.51 6.2 0.175 | (c ) (c ) (c ) | 230 20 55 | (b) (b) | (b) 220 | 0.24 (a) 195 19.9 50 | (b) (b) (b) (b) | |||||
| Nd Sm Eu | 9.7 0.77 | (b) (b) | 9.35 1.1 | (b) (b) | 30 9.56 1.17 | (b) (b) (b) | ||||||||
| Gd Tb Dy Ho Er | 1.8 | (b) | 1.7 10 | (b) (b) | 1.93 | (b) | ||||||||
| Tm Yb Lu Hf Ta W ppb | 6.2 1.1 7.1 0.83 | (b) (b) (b) (b) | 6.4 0.91 6.4 | (b) (b) (b) | 6.7 0.99 8.1 0.98 | (b) (b) (b) (b) | ||||||||
| Re ppb Os ppb Ir ppb | 0.64 6.3 | (c ) (c ) | 6.3 | (c ) | 5.7 | (b) | ||||||||
| Pt ppb Au ppb Th ppm U ppm technique: (a) XRF, (b) INAA, (c ) RNAA, (d) radiation count. | 3.1 | (a) 3.4 1 | (b) (b) | 2.09 | (c ) | 4.15 1.03 | (d) | 2.4 (d) 2.9 | (c ) (b) | 1.3 3.4 0.89 | (b) (b) (b) |
Table 2. Chemical composition of 15511
| reference | Laul 73 | Chou74 | Duncan75 | Korotev87 | ||||
|---|---|---|---|---|---|---|---|---|
| weight SiO2 % TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O P2O5 S % sum | 1.9 12.4 17.4 0.216 12 10 0.369 0.14 | (a) (a) | (a) 12.5 (a) 15.8 (a) 0.23 (a) 9.4 (a) 0.38 (a) 0.17 | 46.04 1.8 (a) 12.14 (a) 16.79 (a) 0.215 10.89 (a) 10.2 (a) 0.35 (a) 0.153 0.193 0.08 | (c ) (c ) (c ) (c ) | (c ) 1.8 (c ) 12.3 (c ) 16.9 (c ) 0.22 (c ) 10.9 (c ) 10.3 (c ) 0.39 | (a) (a) (a) (a) (a) (a) (a) | |
| Sc ppm V Cr Co Ni Cu Zn Ga Ge ppb As | 32 149 3106 48 | (a) 32 (a) 130 (a) 3200 (a) 47 213 14.5 4.65 325 | (a) (b) (a) | (a) 131 (a) 3168 (a) 47 (b) 197 10 (b) 16 | (c ) (c ) | 33.1 (c ) 130 (c ) 3220 (c ) 48.1 (c ) 215 | (a) (a) (a) (a) (a) | |
| Se Rb Sr Y Zr Nb Mo Ru Rh | ? | 4.9 115 68.7 319 19.9 | (c ) (c ) (c ) | (c ) 105 (c ) 300 | (a) (a) | |||
| Pd ppb Ag ppb Cd ppb In ppb Sn ppb Sb ppb Te ppb | 43 44 | (b) (b) | ||||||
| Cs ppm Ba La Ce Pr | 220 20 52 | (a) 190 (a) 20 (a) 59 | (a) (a) | (a) 210 | 0.2 (c ) 211 21.6 57 | (a) (a) (a) (a) | ||
| Nd Sm Eu Gd | 9.1 1.3 | (a) 9.35 (a) 1.15 | (a) (a) | 35 10.4 1.23 | (a) (a) (a) | |||
| Tb Dy Ho | 1.9 11 | (a) 1.7 (a) 11 | (a) (a) | 1.95 | (a) | |||
| Er Tm Yb Lu Hf Ta W ppb Re ppb | 6.9 0.98 6.4 1.2 | (a) | (a) 6.5 (a) 0.9 (a) 6.5 | (a) (a) (a) | 7.2 0.98 8.1 1.05 | (a) (a) (a) (a) | ||
| Os ppb Ir ppb Pt ppb | 5.8 | (b) | 6.4 | (a) | ||||
| Au ppb Th ppm U ppm technique: (a) INAA, (b) RNAA, (c ) XRF | 3 0.7 | (a) 3 (a) | 2 | (b) (a) | 3.1 0.81 | (a) (a) (a) |
Figure 6: Rare gas in 15531 (Alexander et al. 1976).
References for 15500, 15510 and 15530.
Section titled “References for 15500, 15510 and 15530.”Alexander E.C., Bates A., Coscio M.R., Dragon J.C., Mutthy V.R., Pepin R.O. and Venkatesan T.R. (1977) K/Ar dating of lunar soils II. Proc. 7th Lunar Sci. Conf. 625-648.
Baedecker P.A., Chou C.-L. and Wasson J.T. (1972) The extralunar component in lunar soils and breccias. Proc. 3rd Lunar Sci. Conf. 1343-1361.
Baedecker P.A., Chou C.-L., Grunewicz E.B. and Wasson J.T. (1973) Volatile and siderophile trace elements in Apollo 15 samples – geochemical implications. Proc. 4th Lunar Sci. Conf. 1177-1196.
Basford J.R., Dragon J.C., Pepin R.O., Coscio M.R. and Murthy V.R. (1973) Krypton and Xenon in lunar fines. Proc. 4th Lunar Sci. Conf. 1915-1955.
Basu A. and McKay D.S. (1979) Petrography and provenance of Apollo 15 soils. Proc. 10th Lunar Sci. Conf. 1413-1424.
Basu A., McKay D.S., Griffiths S.A. and Nace G. (1981) Regolith maturation on the Earth and the Moon with an example from Apollo 15. Proc. 12th Lunar Planet. Sci. Conf. 433-449.
Best J.B. and Minkin J.A. (1972) Apollo 15 glasses of impact origin. In The Apollo 15 Lunar Samples, 34-39. Lunar Planetary Institute, Houston.
Butler P. (1971) Lunar Sample Catalog, Apollo 15. Curators’ Office, MSC 03209
Carr M.H. and Meyer C.E. (1974) The regolith at the Apollo 15 site and its stratigraphic implications. Geochem. Cosmochem, Acta 38, 1183-1197.
Table 3. Chemical composition of 15531.
| reference | Laul 72 | Schnetzler72 Baedecker73 Korotov87 | Fruchter73 Wanke73 | Murthy72 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| weight SiO2 % TiO2 Al2O3 FeO MnO MgO CaO Na2O | 2.1 10 19.5 0.248 10.5 0.301 | (a) (a) (a) (a) (a) (a) | 2.2 9.9 20.9 0.22 11.3 8 0.27 | (a) (a) (a) | (a) 2.2 (a) 10 (a) 20.7 (a) 0.29 | 46.4 (a) 2.17 (a) 9.9 (a) 20.7 0.25 11.49 9.4 (a) 0.3 | (a) (a) (a) (a) (a) (a) (a) | |||||||
| K2O P2O5 S % sum | 0.09 | (a) 0.091 | (c ) | 0.09 | (a) 0.086 (a) 0.109 | (c ) | ||||||||
| Sc ppm V | 36 182 | (a) (a) | 40.7 | (a) 41 | (a) 39.9 | (a) | ||||||||
| Cr Co Ni | 3353 50 | (a) (a) | 145 | 3840 55.1 (b) 183 | (a) | (a) 3750 (a) 53 | (a) 3810 (a) 55 | (a) (a) | ||||||
| Cu Zn Ga Ge ppb As | 8 3.9 141 | (b) (b) (b) | ||||||||||||
| Se Rb Sr | 2.24 103 | (c ) (c ) | 100 | (a) | 2.618 104.3 | (c ) (c ) | ||||||||
| Y Zr Nb Mo Ru Rh Pd ppb | 130 | (a) 173 | (c ) | 200 | (a) | |||||||||
| Ag ppb Cd ppb In ppb Sn ppb Sb ppb Te ppb | 21 400 | (b) (b) | ||||||||||||
| Cs ppm Ba La Ce Pr | 110 10.9 35 | (a) 117 (a) 28.4 (a) 19.6 | (c ) (c ) (c ) | 0.13 149 13.6 37 | (a) (a) (a) | (a) 12 | (a) 11.6 | (a) | 118 | (c ) | ||||
| Nd Sm Eu | 5.7 1 | (a) 1 (a) | 5.81 | (c ) (c ) | 21 6.82 1.095 | (a) (a) 1 | (a) 5.7 | 24 (a) 5.9 (a) 1.04 | (a) (a) (a) | |||||
| Gd Tb | 1 | (a) | (a) 7.44 | (c ) | 1.05 | (a) 1.2 | (a) | |||||||
| Dy Ho | 8.06 | (c ) | 8 2 | (a) (a) | ||||||||||
| Er Tm Yb | 4.8 | 4.67 (a) 4.14 | (c ) (c ) | 3.61 | (a) 4.2 | (a) 3.9 | (a) | |||||||
| Lu Hf Ta W ppb Re ppb | 0.66 4.4 0.6 | (a) (a) | (a) 0.61 | (c ) | 0.534 4.1 0.57 | (a) | (a) 0.67 (a) 4.2 | (a) 0.67 (a) 3.9 0.52 | (a) (a) (a) | |||||
| Os ppb Ir ppb Pt ppb | 3.4 | (b) 2 | (a) | |||||||||||
| Au ppb Th ppm U ppm | 1.8 | (a) | 1.8 | (b) 1 | 1.19 0.29 | (a) (a) (a) | ||||||||
| technique: (a) INAA, (b) RNAA, (c ) IDMS |
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