Sample 60619
Granoblastic Anorthosite 28 grams
Section titled “Granoblastic Anorthosite 28 grams”
Figure 1: Photo of 60619. NASA S73-20460. Scale in mm/cm.
Introduction
Section titled “Introduction”60619 is a rake sample collected 70 m west of the Lunar Module. It is a coherent, recrystallized, plagioclaserich rock with minor glass-splash and a few micrometeorite craters (figure 1). It has not been well studied.
Petrography
Section titled “Petrography”Dowty et al. (1974) and Warner et al. (1976) reported petrographic descriptions of 60619. The granoblastic texture (figure 2) is caused by extensive subsolidus recrystallization. Small anhedral grains of plagioclase have smooth boundaries and meet in triple junctions. The mafic mineral phases occur 1) as small anhderal grains at these triple junctions, 2) as minute inclusions in the plagioclase or 3) as large grains that enclose small plagioclase.
Mineralogy
Section titled “Mineralogy”Olivine: Olivine is uniform in composition (Fo70).
Pyroxene: Pyroxene compositions determined by Dowty et al. (1974a) and Warner et al. (1976) are illustrated in figure 3.
Figure 2: Thin section photomicrograph of 60619 showing granoblastic texture - mostly plagioclase with minute olivine. Width of field is 4 mm. Crossed nicols. (picture from Dowty et al. 1974).
Plagioclase: Plagioclase is An95. Hansen et al. (1979) determined the trace element composition of plagioclase in 60619.
Ilmenite: Warner et al. (1976) give an analysis of ilmenite.
Chromite: Dowty et al. (1974a) give an analysis of trace chromite found in 60619.
Rutile: A tiny grain of rutile is reported (Dowty et al. 1974a).
Chemistry
Section titled “Chemistry”The only analysis of 60619 is the broad beam analysis of an area on a thin section (Dowty et al. 1974a, Warner et al. 1976).
Radiogenic age dating
Section titled “Radiogenic age dating”None
Figure 3: Pyroxene and olivine composition in 60619 (Warner et al. 1976).
Figure 4: Pyroxene and plagioclase composition in 60619.
Table 1. Chemical composition of 60619.
Section titled “Table 1. Chemical composition of 60619.”| reference | Dowty 74a | |
|---|---|---|
| weight | Warner 76 | |
| SiO2 % | 44.6 | (a) |
| TiO2 | 0.06 | (a) |
| Al2O3 | 32.9 | (a) |
| FeO | 1.2 | (a) |
| MnO | 0.01 | (a) |
| MgO | 1.68 | (a) |
| CaO | 17.8 | (a) |
| Na2O | 0.63 | (a) |
| K2O | 0.04 | (a) |
| P2O5 | 0.03 | (a) |
| S % | ||
| sum | ||
| Sc ppm | ||
| V | ||
| Cr | 68 | (a) |
| Co |
References for 60619
Section titled “References for 60619”- Catalog. pp. 370. Butler P. (1972a) Lunar Sample Information Catalog Apollo Lunar Receiving Laboratory. MSC 03210 Curator’s
Sci. Lett. 24, 15-25. Dowty E., Prinz M. and Keil K. (1974b) Ferroan anorthosite: a widespread and distinctive lunar rock type. Earth Planet.
Lunar Planet. Sci. Conf. 627-638. Hansen E.C., Steele I.M. and Smith J.V. (1979a) Lunar highland rocks: Element partitioning among minerals 1: Electron microprobe analyses of Na, K, and Fe in plagioclase; mg partitioning with orthopyroxene. Proc. 10th
element mobility. Proc. 12th 259. Hunter R.H. and Taylor L.A. (1981) Rust and schreibersite in Apollo 16 highland rocks: Manifestations of volatile-Lunar Planet. Sci. Conf. 253-
rake samples from the LM area and station 5. Catalog, JSC. Keil K., Dowty E., Prinz M. and Bunch T.E. (1972) Description, classification and inventory of 151 Apollo 16 Curator’s
and chemical description. Science 179, 23-34. LSPET (1973b) The Apollo 16 lunar samples: Petrographic
7-1—7-58. LSPET (1972c) Preliminary examination of lunar samples. In Apollo 16 Preliminary Science Report. NASA SP-315,
Ryder G. and Norman M.D. (1980) Catalog of Apollo 16 rocks (3 vol.). Curator’s Office pub. #52, JSC #16904
(Ulrich et al. ) U.S.G.S. Prof. Paper 1048. Sutton R.L. (1981) Documentation of Apollo 16 samples. In Geology of the Apollo 16 area, central lunar highlands.
from the LM area and station 5. Institute of Meteoritics, Albuquerque. 87 pp. Warner R.D., Dowty E., Prinz M., Conrad G.H., Nehru C.E. and Keil K. (1976c) Catalog of Apollo 16 rake samples Spec. Publ. #13, UNM
