Lithium,sodium and potassium abundances in carbonaceous chondrites |
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Authors: | Walter Nichiporuk Carleton B Moore |
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Institution: | Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85281, U.S.A. |
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Abstract: | Concentrations of lithium, sodium, and potassium in 18 carbonaceous chondrites were determined in the same sample solution by atomic absorption. Mean abundances in carbonaceous Type I chondrites are, in atoms 106 Si: Li = 60.1, Na = 5800, K = 3700. Relative to Type I carbonaceous chondrites, abundances in Type II's are: Li = 0.87, Na = 0.61, K = 0.58; and in Type III's Li = 0.82, Na = 0.49, K = 0.36. Evidently there is a differential depletion of potassium relative to sodium in Type III's, suggesting a fractionation after accretion. |
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