Sample 71595
71595 – 25.2 grams 71576 – 23.5 grams Ilmenite Basalt
Figure 1: Photo of 71595. Sample is 2 cm. S73-33406
Figure 2: Map of station 1 showing location of rake samples.
Mineralogical Mode
Section titled “Mineralogical Mode”| 71595 | 71576 | |
|---|---|---|
| Olivine | 6.8 | 5.8 |
| Pyroxene | 44 | 43 |
| Plagioclase | 27.1 | 32.7 |
| Opaques | 17 | 16 |
| Silica | 4.6 | 1.4 |
| Meostasis | 0.6 | 0.8 |
Introduction
Section titled “Introduction”71595 is an olivine-microporphyritic ilmenite basalt similar to 71576 (Warner et al. 1978). It has been rounded by micrometeorite bombardment.
71525 - 71596 etc. are rake samples collected as part of a comprehensive sample at station 1, taken near Steno Crater, Apollo 17. They include numerous small ilmenite basalts.
Figure 3: Pyroxene and olivine composition in 71595 and 71576 (Warner et al. 1978).
Petrography
Section titled “Petrography”71595 and 71576 are fine-grained basalts with skeletal olivine and ilmenite phenocrysts in a variolitic groundmass (figures 6 and 7). Armalcolite is present, mantled by ilmenite. Ca-rich pyroxene is zoned to Ferich (figure 3).
Chemistry
Section titled “Chemistry”Murali et al. (1977) give the chemical composition of 30 small Apollo 17 basalts including 71595 and 71576 (figures 4 and 5). These samples have been classified as type B2 by Neal and Taylor (1993).
Radiogenic age dating
Section titled “Radiogenic age dating”None
Processing
Section titled “Processing”There is one thin section for each.
References for 71595 and 71576.
Section titled “References for 71595 and 71576.”Butler P. (1973) Lunar Sample Information Catalog Apollo 17. Lunar Receiving Laboratory. MSC 03211 Curator’s Catalog. pp. 447.
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.
Figure 4: Compsition of 71595 compared with that of other lunar basalts.
Figure 5: Normalized rare-earth-element diagram for 71595 and type A and B basalts.
Murali A.V., Ma M.-S., Schmitt R.A., Warner R.D., Keil K. and Taylor G.J. (1977b) Chemistry of 30 Apollo 17 rake basalts; 71597 a product of partial olivine accumulation (abs). *Lunar Sci.*VIII, 703-705. Lunar Planetary Institute, Houston.
Lunar Sample Compendium C Meyer 2011
Lunar Sample Compendium C Meyer 2011
Figure 7: Photomicrograph of thin section 71576,3 (with quartz plate). 2.8 mm across.
Neal C.R. and Taylor L.A. (1993) Catalog of Apollo 17 rocks. Vol. 2 Basalts
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.
Warner R.D., Keil K., Nehru C.E. and Taylor G.J. (1978) Catalogue of Apollo 17 rake samples from Stations la, 2, 7, and 8. Spec. Publ. #18, UNM Institute of Meteoritics, Albuquerque. 88 pp.
Warner R.D., Nehru C.E. and Keil K. (1978g) Opaque oxide mineral crystallization in lunar high-titanium basalts. Am. Mineral. 68, 1209-1224.
Warner R.D., Taylor G.J., Conrad G.H., Northrop H.R., Barker S., Keil K., Ma M.-S. and Schmitt R. (1979a) Apollo 17 high-Ti mare basalts: New bulk compositional data, magma types, and petrogenesis. Proc. 10th Lunar Planet. Sci. Conf. 225-247.
Table 1. Chemical composition of 71595. Table 2. Chemical composition of 71576.
| reference weight | Murali77 | reference Murali77 weight | |||
|---|---|---|---|---|---|
| SiO2 % TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O P2O5 S % sum | 10.4 9.3 19.6 0.25 7.4 10.6 0.39 0.044 | (a) (a) (a) (a) (a) (a) (a) (a) | SiO2 % TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O P2O5 S % sum | 11.8 8.9 20 0.242 6.8 10.6 0.39 0.053 | (a) (a) (a) (a) (a) (a) (a) (a) |
| Sc ppm V Cr Co Ni Cu Zn Ga Ge ppb As Se Rb Sr Y Zr Nb Mo Ru Rh Pd ppb Ag ppb Cd ppb In ppb Sn ppb Sb ppb Te ppb Cs ppm Ba | 78 100 2846 18 | (a) (a) (a) (a) | Sc ppm V Cr Co Ni Cu Zn Ga Ge ppb As Se Rb Sr Y Zr Nb Mo Ru Rh Pd ppb Ag ppb Cd ppb In ppb Sn ppb Sb ppb Te ppb Cs ppm Ba | 80 85 2292 19 | (a) (a) (a) (a) |
| La Ce Pr Nd | 6.4 29 | (a) (a) | La Ce Pr Nd | 6.7 31 | (a) (a) |
| Sm Eu Gd | 6.9 1.43 | (a) (a) | Sm Eu Gd | 7.6 1.54 | (a) (a) |
| Tb Dy Ho Er Tm | 1.8 12 | (a) (a) | Tb Dy Ho Er Tm | 1.8 12 | (a) (a) |
| Yb Lu Hf Ta W ppb Re ppb Os ppb Ir ppb Pt ppb Au ppb Th ppm U ppm technique: (a) INAA | 7.5 1.11 6.5 1.5 | (a) (a) (a) (a) | Yb Lu Hf Ta W ppb Re ppb Os ppb Ir ppb Pt ppb Au ppb Th ppm U ppm | 8 1.15 7 1.5 technique: (a) INAA | (a) (a) (a) (a) |