A lunar soil evolution model |
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Authors: | W W Mendell D S McKay |
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Institution: | 1. NASA Johnson Space Center, Houston, Tex., USA
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Abstract: | Comminution, agglutination, and replenishment processes in a lunar soil are modeled by a system of time dependent, linear differential equations. In the model a soil is subdivided into coarse particle, fine particle, and agglutinate fractions. The relative mass abundance of each component in a mature soil is found to be proportional to rates for the reworking processes. Evolution of the grain size distribution from a fresh ejecta blanket to a mature soil is described quantitatively in terms of the changing proportions of the three soil constituents. If size data is available for an immature soil and a mature soil of the same system, rates for the various processes can be calculated under certain simplifying assumptions. |
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