Lunar prospector measurements of the distribution of incompatible elements gadolinium, samarium and thorium

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Lunar Prospector neutron spectrometer (NS) and gamma ray spectrometer (GRS) observations have been used to map out the distribution of incompatible elements on the lunar surface. Specifically, the GRS data provide maps of the distribution of thorium and potassium while the NS data provide information on the distribution of iron and titanium, and the rare earth elements gadolinium and samarium. Using results of analysis of Celementine spectral reflectance (CSR) data, the Fe- and Ti-contributions to the NS data can be removed, leaving primarily rare earth element contributions from Gd and Sm. The Th and K maps correlate with the inferred ... continued below

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3 p.

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Elphic, R.C.; Lawrence, D.J.; Feldman, W.C.; Barraclough, B.L.; Maurice, S.; Binder, A.B. et al. April 1, 1999.

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Lunar Prospector neutron spectrometer (NS) and gamma ray spectrometer (GRS) observations have been used to map out the distribution of incompatible elements on the lunar surface. Specifically, the GRS data provide maps of the distribution of thorium and potassium while the NS data provide information on the distribution of iron and titanium, and the rare earth elements gadolinium and samarium. Using results of analysis of Celementine spectral reflectance (CSR) data, the Fe- and Ti-contributions to the NS data can be removed, leaving primarily rare earth element contributions from Gd and Sm. The Th and K maps correlate with the inferred Gd and Sm maps (r {approximately} 0.93), but there are regions of significant disagreement. One of these is in the KREEP-rich circum-Imbrium ring. No clear explanation has emerged for this disagreement, though Th, K, Gd and Sm have differing degrees of incompatibility. These results clearly are important to discussions of the geochemistry of the Procellarum-Imbrium Th-rich Terrane and the South-Pole-Aitken Terrane.

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3 p.

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OSTI as DE99002217

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  • Lunar and planetary science conference, Houston, TX (United States), 15-19 Mar 1999

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  • Other: DE99002217
  • Report No.: LA-UR--99-521
  • Report No.: CONF-990303--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 334321
  • Archival Resource Key: ark:/67531/metadc678276

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  • April 1, 1999

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 29, 2016, 9:36 p.m.

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Elphic, R.C.; Lawrence, D.J.; Feldman, W.C.; Barraclough, B.L.; Maurice, S.; Binder, A.B. et al. Lunar prospector measurements of the distribution of incompatible elements gadolinium, samarium and thorium, article, April 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc678276/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.