NASA Technical Reports Server NTRS 20140013300: Space Weathering of Olivine in Lunar Soils: A Comparison to Itokawa Regolith SamplesReportar como inadecuado



 NASA Technical Reports Server NTRS 20140013300: Space Weathering of Olivine in Lunar Soils: A Comparison to Itokawa Regolith Samples


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Regolith particles from airless bodies preserve a record of the space weathering processes that occurred during their surface exposure history. These processes have major implications for interpreting remote-sensing data from airless bodies. Solar wind irradiation effects occur in the rims of exposed grains, and impact processes result in the accumulation of vapordeposited elements and other surface-adhering materials. The grains returned from the surface of Itokawa by the Hayabusa mission allow the space weathering -style- of a chondritic, asteroidal -soil- to be compared to the lunar case. Here, we present new studies of space-weathered olivine grains from lunar soils, and compare these results to olivine grains from Itokawa. Samples and Methods: We analyzed microtome thin sections of olivine grains from the 20-45 micron fractions of three lunar soils: 71061, 71501 and 10084 immature, submature and mature, respectively. Imaging and analytical data were obtained using a JEOL 2500SE 200kV field-emission scanning-transmission electron microscope equipped with a thin-window energy-dispersive x-ray spectrometer. Similar analyses were obtained from three Hayabusa olivine grains. Results and Discussion: We observed lunar grains showing a range of solar flare track densities from



Autor: NASA Technical Reports Server (NTRS)

Fuente: https://archive.org/



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