Advertisement

The moon

, Volume 14, Issue 3–4, pp 373–383 | Cite as

Meteoritic material in a Boulder from the Apollo 17 Site: Implications for its origin

  • John W. Morgan
  • H. Higuchi
  • Edward Anders
Article

Abstract

Sixteen samples of Boulder 1 from Station 2 at the Apollo 17 site were analyzed by radiochemical neutron activation analysis for Ag, Au, Bi, Br, Cd, Cs, Ge, Ir, Ni, Rb, Re, Sb, Te, Tl, U, and Zn. Two clast samples contam no meteoritic material and appear to consist of relatively pristine igneous rocks: an unusual, KREEP-rich pigeonite basalt of very high Ge content, and an alkali-poor coarse norite. Nine grey or black breccia samples contain a unique, Group 3 meteoritic component of Ir/Au ratio 0.65–0.82, which appears to separate into subgroups 3H and 3L on the basis of Ni, Ge, and Re content. It is quite distinct from the Group 2 component (Ir/Au - 0.46–0.54) that dominates at the Apollo 17 site.

The unique black-rimmed clasts from this boulder show striking compositional zoning. The cores of anorthositic breccia are very low in Rb, Cs, and U, and have a distinctive 5L meteoritic component (Ir/Au≈1.1). The black rinds are 5- to 10-fold richer in Rb, Cs, and U and have a Group 3 meteoritic component. The cores may represent breccias formed in an earlier impact that became coated with alkali-rich ejecta during the event that produced the boulder.

Because of the rarity of the Group 3 meteoritic component at the Apollo 17 site, this boulder cannot represent ordinary Serenitatis ejecta, with their characteristic admixture of the Group 2 Serenitatis projectile. It may represent pre-Serenitatis material excavated from the fringes of the crater during late stages of the Serenitatis impact, but only lightly shocked and hence uncontaminated by the Serenitatis projectile.

Keywords

Late Stage Boulder Breccia Activation Analysis Neutron Activation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Banerjee, S. K. and Swits, G.: 1975, this issue, p. 473.Google Scholar
  2. Blanchard, D. P., Haskin, L. A., Jacobs, J. W., Brannon, J. C., and Korotev, R. L.: 1974,Interdisciplinary Studies of Samples from Boulder 1, Station 2, Apollo 17, L.S.I. Contr. No. 211D, pp. IV-1–IV-18.Google Scholar
  3. Bjork, R. L.: 1961,J. Geophys. Res. 66, 3379–3387.Google Scholar
  4. Compston, W., Foster, J. J., and Gray, C. M.: 1975, this issue, p. 445.Google Scholar
  5. Ganapathy, R., Morgan, J. W., Krähenbühl, U., and Anders, E.: 1973,Proc. Fourth Lunar Sci. Conf. 2, 1239–1261.Google Scholar
  6. Haines, E. L., Hutcheon, I. D., and Weiss, J. R.: 1974,Lunar Science V, The Lunar Science Institute, 304–306.Google Scholar
  7. Haines, E. L., Hutcheon, I. D., and Weiss, J. R.: 1975,Lunar Science VI, The Lunar Science Institute, 324–326.Google Scholar
  8. Higuchi, H. and Morgan, J. W.: 1975,Proc. Sixth Lunar Sci. Conf., in press.Google Scholar
  9. Keays, R. R., Ganapathy, R., Laul J. C., Krähenbühl, U., and Morgan, J. W.: 1974,Anal. Chim. Acta 72, 1–29.Google Scholar
  10. Krähenbühl, U., Ganapathy, R., Morgan. J. W., and Anders, E.: 1973,Proc. Fourth Lunar Sci. Conf. 2, 1325–1348.Google Scholar
  11. Laul, J. C. and Schmitt, R. A.: 1974,Earth Planetary Sci. Letters 23, 206–219.Google Scholar
  12. Misra, K. C. and Taylor, L. A.: 1975,Lunar Science VI, The Lunar Science Institute, 566–568.Google Scholar
  13. Morgan, J. W., Laul, J. C., Krähenbühl, U., Ganapathy, R., and Anders, E.: 1972,Proc. Third Lunar Sci. Conf. 2, 1377–1395.Google Scholar
  14. Morgan, J. W., Krähenbühl, U., Ganapathy, R., Anders, E., and Marvin, U. B.: 1973,Proc. Fourth Lunar Sci. Conf. 2, 1379–1398.Google Scholar
  15. Morgan, J. W., Ganapathy, R., Higuchi, H., Krähenbühl, U., and Anders, E.: 1974a,Proc. Fifth Lunar Sci. Conf. 2, 1703–1737.Google Scholar
  16. Morgan, J. W., Ganapathy, R., Higuchi, H., and Anders, E.: 1974b,Interdisciplinary Studies of Samples from Boulder 1, Station 2, Apollo 17, L.S.I. Contr. No. 210D, pp. 131–138.Google Scholar
  17. Morgan, J. W., Higuchi, H., Ganapathy, R., and Anders, E.: 1975,Proc. Sixth Lunar Sci. Conf., in press.Google Scholar
  18. Oberbeck, V. R., Hörz, R., Morrison, R. H., Quaide, W. L., and Gault, D. E.: 1975,Moon 12, 19–54.Google Scholar
  19. Ryder, G., Stoeser, D. B., Marvin, U. B., Bower, J. F., and Wood, J. A.: 1975, this issue, p. 327.Google Scholar
  20. Schmitt, H. H.: 1973,Science 182, 680–690.Google Scholar
  21. Schmitt, H. H.: 1975, this issue, p. 491.Google Scholar
  22. Stoeser, D. B., Marvin, U. B., Bower, J. F.: 1974a,Interdisciplinary Studies of Samples from Boulder 1, Station 2, Apollo 17, L.S.I. Contr. No. 211D, pp. III-1–III-51.Google Scholar
  23. Stoeser, D. B., Marvin, U. B., Wood, J. A., Wolfe, R. W., and Bower, J. F.: 1974b,Proc. Fifth Lunar Sci. Conf. 1, 355–377.Google Scholar
  24. Wänke, H., Baddenhausen, H., Balacescu, A., Teschke, F., Spettel, B., Dreibus, G., Palme, H., Quijano-Rico, M., Kruse, H., Wlotzka, F., and Begemann, F.: 1972,Proc. Third Lunar Sci. Conf. 2, 1251–1268.Google Scholar
  25. Wood, J. A.: 1975, this issue, p. 505.Google Scholar

Copyright information

© D. Reidel Publishing Company, Dordrecht-Holland 1975

Authors and Affiliations

  • John W. Morgan
    • 1
  • H. Higuchi
    • 1
  • Edward Anders
    • 1
  1. 1.Enrico Fermi Institute and Dept. of ChemistryUniversity of ChicagoChicagoUSA

Personalised recommendations