The chemical composition of soil from the Apollo 16 and Luna 20 sites |
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| Authors: | BM Bansal SE Church PW Gast NJ Hubbard JM Rhodes H Wiesmann |
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| Institution: | 1. Lockheed Electronics Company, Houston, Texas 77058, USA;2. NASA Manned Spacecraft Center, Houston, Texas 77058, USA |
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| Abstract: | The concentrations of the rare earth elements (REE), K, Rb, Sr, Ba, U, Zr and Cr for the Luna 20 soil and four different Apollo 16 soils are reported. These trace element abundances imply: (1) that the lunar highlands consist of a mixture of rocks rich in large ion lithophile (LIL) elements and LIL-element impoverished anorthosites; or (2) that the bulk of the aluminum-rich crust did not originate by upward segregation of plagioclase in a primitive liquid shell. The Luna 20 soil is distinguished from the Apollo 16 soil by lower aluminum and LIL element abundances. |
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