Sample 67556
67556 Impact Melt Breccia 82.1 grams
Section titled “67556 Impact Melt Breccia 82.1 grams”
Figure 1: Photo of 67556. Scale in mm. S72-51241
Introduction
Section titled “Introduction”67556 is a rake sample collected from the rim of North Ray Crater – see section on 67481. It is a friable micropoikilitic impact melt with intrusive glass veins. It has a micrometeorite crater (figure 1).
Petrography
Section titled “Petrography”67556 is a micropoikilitic impact melt breccia that that has been highly shocked. It is “riddled” with glass veins with abundant metal grains (Ryder and Norman 1980). Mineral analyses are not available.
Chemistry
Section titled “Chemistry”67556 has been analyzed by the North Ray Consortium (Stoffler et al. 1985). There appear to be three analyses of the thin section by defocused beam analysis and one bulk analysis by INAA (table and figure 3).
Radiogenic age dating
Section titled “Radiogenic age dating”Not
Processing
Section titled “Processing”There is one thin section and no way to know if it is representative.
Lunar Sample Compendium C Meyer 2012
Table 1. Chemical composition of 67556
Section titled “Table 1. Chemical composition of 67556”| weight | reference Stoffler85 | Borchardt 86 Stoffler85 | |||
|---|---|---|---|---|---|
| SiO2 % | 45.2 | 46.4 | 44.6 | 45.6 | (a) |
| TiO2 | 0.65 | 0.31 | 0.53 | 1.26 | (a) |
| Al2O3 | 21.5 | 20.8 | 22.16 | 22.4 | (a) |
| FeO | 6.3 | 6.2 | 6.2 | 6.03 | (a) |
| MnO | 0.02 | 0.11 | 0.06 | 0.09 | (a) |
| MgO | 10.6 | 13 | 10.9 | 11 | (a) |
| CaO | 14.2 | 12.3 | 12.8 | 12.9 | (a) |
| Na2O | 0.53 | 0.46 | 0.525 | 0.42 | (a) |
| K2O | 0.26 | 0.12 | 0.185 | 0.17 | (a) |
| P2O5 | 0.56 | 0.1 | 0.4 | 0.12 | (a) |
| Sc ppm | 9.27 | 9.27 | 9.27 | (b) | |
| Cr | |||||
| Co | 24.4 | 24.4 | 24.4 | (b) | |
| Ni | 368 | 368 | 368 | (b) | |
| Ba | 186 | 186 | 186 | (b) | |
| Sm | 8.68 | 8.68 | 8.68 | (b) | |
| Yb | 5.74 | 5.74 | 5.74 | (b) | |
| technique: (a) DBA, (b) INAA |
Figure 3: Noramlized rare-earth-element diagram for 67556 (Stoffler et al. 1985).
References for 67556
Section titled “References for 67556”Borchardt R., Stoffler D., Spettel B., Palme H., Wanke H., Wacker K. and Jessberger E.K. (1986) Composition, structure and age of the Apollo 16 subregolith basement as deduced from the chemistry of post-Imbrium melt bombs. Proc. 17th Lunar Planet. Sci. Conf. in J. Geophys. Res. 90, E43-E54.
Butler P. (1972a) Lunar Sample Information Catalog Apollo 16. Lunar Receiving Laboratory. MSC 03210 Curator’s Catalog. pp. 370.
LSPET (1973b) The Apollo 16 lunar samples: Petrographic and chemical description. Science 179, 23-34.
LSPET (1972c) Preliminary examination of lunar samples. In Apollo 16 Preliminary Science Report. NASA SP-315, 7-1—7-58.
Ryder G. and Norman M.D. (1980) Catalog of Apollo 16 rocks (3 vol.). Curator’s Office pub. #52, JSC #16904
Smith J.V. and Steele I.M. (1972c) Apollo 16 rake samples 67515 to 68537: Sample classification, description and inventory. Curator Catalog, JSC
Stöffler D., Ostertag R., Reimold W.U., Borchardt R., Malley J. and Rehfeldt A. (1981) Distribution and provenance of lunar highland rock types at North Ray Crater, Apollo 16. Proc. 12th Lunar Planet. Sci. Conf. 185-207.
Stöffler D., Bischoff A., Borchardt R., Burghele A., Deutsch A., Jessberger E.K., Ostertag R., Palme H., Spettel B., Reimold W.U., Wacker K. and Wanke H. (1985) Composition and evolution of the lunar crust in the Descartes highlands. Proc. 15th Lunar Planet. Sci. Conf. in J. Geophys. Res. 90, C449-C506.
Sutton R.L. (1981) Documentation of Apollo 16 samples. In Geology of the Apollo 16 area, central lunar highlands. (Ulrich et al. ) U.S.G.S. Prof. Paper 1048.