Sample 71175
Ilmenite Basalt 207.8 grams
Section titled “Ilmenite Basalt 207.8 grams”
Figure 1: Astronaut photo of boulders sampled at station 1, Apollo 17. AS-136-20741.
Introduction
Section titled “Introduction”71175 is an equigranular basalt found partially buried near the 71135 – 71155 boulder (figure 1). It has not been adequately studied and has not been dated – although all Apollo 17 basalts are 3.72 b.y. old.
Petrography
Section titled “Petrography”71175 has a subophitic texture with long crystals of plagioclase (> 2mm) intergrown with pyroxene (figure 6). Abundant equigranular ilmenite is sprinkled throughout. Large (up to 0.8 mm) regions of silica are reported (Neal and Taylor 1993).
Brown et al. (1975) reported a mineral mode and Roedder and Weiblen (1975) studied K-rich silicate inclusions in ilmenite. However, pyroxene composition has not bee reported.
Figure 2: Location map for station 1, Apollo 17.
Figure 3: Photo of top surface of 71175. Cube is 1 cm. S73-15728.
Green et al. (1975) used the composition of 71175 to determine the phase diagram for high-Ti basalt.
Chemistry
Section titled “Chemistry”The chemical composition of 71175 has been determined by Warner et al. (1975), Rhodes et al. (1976) and Eldridge et al. (1974). Gibson et al. (1975) reported 1685 ppm S.
Radiogenic age dating
Section titled “Radiogenic age dating”The age of 71175 has not been determined, but Nyquist et al. (1976) determined the Rb, Sr and Sr87/86 ratio for the “whole rock”.
Cosmogenic isotopes and exposure ages
Section titled “Cosmogenic isotopes and exposure ages”O’Kelley et al. (1974) determined the cosmic-rayinduced activity of 22Na = 68 dpm/kg., 26Al = 60 dpm/ kg., 46Sc = 43 dpm/kg., 54Mn = 125 dpm/kg and 56Co = 120 dpm/kg.
Processing
Section titled “Processing”There are 5 thin sections.
Mineralogical Mode
Section titled “Mineralogical Mode”| Olivine | 1.7 |
|---|---|
| Pyroxene | 50.2 |
| Plagioclase | 27.1 |
| Opaques | 19.4 |
| Silica | 1.6 |
| Meostasis |
Lunar Sample Compendium C Meyer 2011
Lunar Sample Compendium C Meyer 2011
Table 1. Chemical composition of 71175.
| reference weight | Rhodes76 Nyquist76 | Eldridge74 | Warner75 | |||
|---|---|---|---|---|---|---|
| SiO2 % 37.9 TiO2 13.0 Al2O3 8.47 FeO 19.3 MnO 0.28 MgO 9.63 | 37.93 13.08 8.47 19.37 0.28 9.63 9.79 0.38 0.04 0.04 | (a) (a) (a) (a) (a) (a) (a) (a) (a) (a) | 0.067 | (d) | 12.7 9.1 20.5 0.238 10.1 9.2 0.387 0.059 | (b) (b) (b) (b) (b) (b) (b) |
| Sc ppm V | 77 | (b) | 78 122 | (b) | ||
| Cr Co Ni Cu | 3695 17.6 | (a) (b) | 3462 22 | (b) (b) (b) | ||
| Zn Ga Ge ppb As Se Rb Sr Y Zr Nb Mo Ru Rh Pd ppb Ag ppb | 0.59 184 | (c) | ||||
| Cd ppb In ppb Sn ppb Sb ppb Te ppb Cs ppm Ba La Ce | 78.5 6.43 22.3 | (c) (c) | 5 | (b) | ||
| Pr Nd | 24.7 | (c) | ||||
| Sm Eu Gd Tb | 10.3 2.08 15.7 | (c) (c) | 8 1.89 | (b) (b) | ||
| Dy Ho | 18 | (c) | 14 | (b) | ||
| Er | 11 | (c) | ||||
| Tm Yb Lu Hf Ta W ppb Re ppb | 9.69 1.52 8.9 | (c) (b) | 8.3 1.2 | (b) (b) | ||
| Os ppb Ir ppb Pt ppb Au ppb Th ppm U ppm | (a) XR | F, (b) | 0.39 0.11 INAA, (c) | (d) (d) IDM | ’S, (d) rac | liation c |
Figure 5: Composition of 71175 compared with other Apollo basalts.
Figure 6: 71175 is a type A basalt (based on trace element analysis).
Figure 7: Normalized rare-earth-element diagram for 71175 and type A and B basalts.
References for 71175
Section titled “References for 71175”Brown G.M., Peckett A., Emeleus C.H., Phillips R. and Pinsent R.H. (1975a) Petrology and mineralogy of Apollo 17 mare basalts. Proc. 6th Lunar Sci. Conf. 1-13.
TS
Butler P. (1973) Lunar Sample Information Catalog Apollo 17. Lunar Receiving Laboratory. MSC 03211 Curator’s Catalog. pp. 447.
Eldridge J.S., O’Kelly G.D. and Northcutt K.J. (1974a) Primordial radioelement concentrations in rocks and soils from Taurus-Littrow. Proc. 5th Lunar Sci. Conf. 1025-1033.
Gibson E.K., Usselman T.M. and Morris R.V. (1976a) Sulfur in the Apollo 17 basalts and their source regions. Proc. 7th Lunar Sci. Conf. 1491-1505.
Green D.H., Ringwood A.E., Hibberson W.O. and Ware N.G. (1975a) Experimental petrology of Apollo 17 mare basalts. Proc. 6th Lunar Sci. Conf. 871-893.
Keith J.E., Clark R.S. and Bennett L.J. (1974a) Determination of natural and cosmic ray induced radionuclides in Apollo 17 lunar samples. Proc. 5th Lunar Sci. Conf. 2121-2138.
LSPET (1973) Apollo 17 lunar samples: Chemical and petrographic description. Science 182, 659-672.
LSPET (1973) Preliminary Examination of lunar samples. Apollo 17 Preliminary Science Rpt. NASA SP-330. 7-1 – 7-46.
Muehlberger et al. (1973) Documentation and environment of the Apollo 17 samples: A preliminary report. Astrogeology 71 322 pp superceeded by Astrogeolgy 73 (1975) and by Wolfe et al. (1981)
Muehlberger W.R. and many others (1973) Preliminary Geological Investigation of the Apollo 17 Landing Site*. In* Apollo 17 Preliminary Science Report. NASA SP-330.
Neal C.R. and Taylor L.A. (1993) Catalog of Apollo 17 rocks. Vol. 2 Basalts
Nyquist L.E., Bansal B.M. and Wiesmann H. (1976a) Sr isotopic constraints on the petrogenesis of Apollo 17 mare basalts. Proc. 7th Lunar Sci. Conf. 1507-1528.
O’Kelly G.D., Eldridge J.S. and Northcutt K.J. (1974a) Cosmogenic radionuclides in samples from Taurus-Littrow: Effects of the solar flare of August 1972. Proc. 5th Lunar Sci. Conf. 2139-2147.
Papike J.J., Hodges F.N., Bence A.E., Cameron M. and Rhodes J.M. (1976) Mare basalts: Crystal chemistry, mineralogy and petrology. Rev. Geophys. Space Phys. 14, 475-540.
Rhodes J.M., Hubbard N.J., Wiesmann H., Rodgers K.V., Brannon J.C. and Bansal B.M. (1976a) Chemistry, classification, and petrogenesis of Apollo 17 mare basalts. Proc. 7th Lunar Sci. Conf. 1467-1489.
Warner R.D., Keil K., Murali A.V. and Schmitt R.A. (1975a) Petrogenetic relationships among Apollo-17 basalts. In Papers presented to the Conference on Origins of Mare Basalts and their Implications for Lunar Evolution (Lunar Science Institute, Houston), 179-183.
Warner R.D., Keil K., Prinz M., Laul J.C., Murali A.V. and Schmitt R.A. (1975b) Mineralogy, petrology, and chemistry of mare basalts from Apollo 17 rake samples. Proc. 6th Lunar Sci. Conf. 193-220.
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.