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Science 15 May 1970:
Vol. 168. no. 3933, pp. 825 - 828
DOI: 10.1126/science.168.3933.825
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Articles

Chemical Composition of the Lunar Surface in a Terra Region near the Crater Tycho

James H. Patterson 1, Anthony L. Turkevich 2, Ernest J. Franzgrote 3, Thanasis E. Economou 4, and Kenneth P. Sowinski 4

1 Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439
2 Enrico Fermi Institute and Department of Chemistry, University of Chicago, Chicago, Illinois 60637
3 Jet Propulsion Laboratory, Pasadena, California 91103
4 Enrico Fermi Institute, University of Chicago

More precise and comprehensive analytical results for lunar surface material in a terra region have been derived from the data of the alpha-scattering experiment on Surveyor 7. The silicon content and the low sodium abundance are close to that of mare material. The abundances of titanium and iron are at least a factor of 2 lower, whereas the abundances of aluminum and calcium are significantly higher. The analytical results provide direct evidence for chemical differentiation in the moon and indicate a lunar crust of appreciably lower density than the whole moon and with lower density and higher albedo than lunar mare material.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Tektites from the Earth.
H. C. Urey, H. C. Urey, and J. A. O'Keefe (1971)
Science 171, 312-314
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