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Space weathering on airless bodies: Resolving a mystery with lunar samples

Space weathering on airless bodies: Resolving a mystery with lunar samples,10.1111/j.1945-5100.2000.tb01496.x,Meteoritics & Planetary Science,Carlé M.

Space weathering on airless bodies: Resolving a mystery with lunar samples   (Citations: 178)
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Using new techniques to examine the products of space weathering of lunar soils, we demonstrate that nanophase reduced iron (npFe0) is produced on the surface of grains by a combination of vapor deposition and irradiation effects. The optical properties of soils (both measured and modeled) are shown to be highly dependent on the cumulative amount of npFe0, which varies with different starting materials and the energetics of different parts of the solar system. The measured properties of intermediate albedo asteroids, the abundant S-type in particular, are shown to directly mimic the effects predicted for small amounts of npFe0 on grains of an ordinary chondrite regolith. This measurement and characterization of space weathering products seems to remove a final obstacle hindering a link between the abundant ordinary chondrite meteorites and common asteroids.
Journal: Meteoritics & Planetary Science - METEORIT PLANETARY SCI , vol. 35, no. 5, pp. 1101-1107, 2000
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    • ...[11] The spectral properties of the Moon with space weathering show a remarkably linear response in reflectance as a function of wavelength [e.g., McCord et al., 2011; Pieters et al., 2000] (Figures 3 and 4). Pyroxenes also have a relatively linear response in their reflectance spectra between about 2.6 and 3 mm. We exploit these properties by using shorter wavelengths to project to longer wavelengths and estimate the reflectance spectrum, ...

    Roger N. Clarket al. Thermal removal from near-infrared imaging spectroscopy data of the Mo...

    • ...On the Moon, continuum slopes are predominantly affected by the presence of vapor‐deposited nanophase iron‐bearing rims on grains of lunar soil [e.g., Pieters et al., 2000; Hapke, 2001; Taylor et al., 2001; Noble et al., 2005, 2007; Taylor et al., 2010]...
    • ...This effect becomes more pronounced with increasing degree of weathering [e.g., Pieters et al., 2000; Noble et al., 2001]...

    Peter J. Isaacsonet al. Remote compositional analysis of lunar olivine-rich lithologies with M...

    • ...This has been produced by micrometeorite, impact‐produced vaporization and subsequent deposition of silica‐rich glass, containing myriads of these npFe 0 grains, as rims on virtually all particles in a maturesoil.Controversyexistsastothecontributionsmadeto the formation of this npFe 0 from solar wind sputtering [Pieters et al., 2000; Hapke, 2001; Taylor et al., 2001; Noble et al., 2007; Taylor et al., 2010]...
    • ...[3] The optical effects that accompany npFe 0 production have been shown to commonly include three interrelated effects: reduction in contrast of mafic absorption bands; increase in spectral slope (“reddening”); and a darkening of visible to near‐infrared albedo [Fischer and Pieters, 1994, 1996; Pieters et al., 2000; Hapke, 2001; Noble et al., 2007]...

    J. W. Nettleset al. Optical maturity variation in lunar spectra as measured by Moon Minera...

    • ...The spectral characteristics of space weathered soils differ from those of fresh lunar rocks in three major ways [Adams and Jones, 1970; Hapke et al., 1975; Pieters et al., 1993; Fischer and Pieters, 1994, 1996; Pieters et al., 2000; Hapke, 2001]: (1) an overall decrease in visible (VIS) to near‐infrared (NIR) reflectance, (2) reduction in the contrast of diagnostic mineralogical absorption bands, and (3) an increase in reflectance with ...
    • ...Surface maturity estimates using remotely sensed spectral reflectance data [Fischer and Pieters, 1996; Shkuratov et al., 1999; Lucey et al., 2000] are based on laboratory measurements of lunar soils that correlate abundance and size distribution of npFe0 with darkening, reddening, and reduced spectral contrast [e.g., Britt and Pieters, 1994; Pieters et al., 1994, 2000; Noble et al., 2001, 2007]...
    • ...In typical lunar regions, that is, outside the influence of a magnetic anomaly, the spectral changes as a soil matures have been well studied and characterized in the laboratory [e.g., Pieters et al., 1993, 2000; Hapke, 2001]...

    Georgiana Y. Krameret al. Characterization of lunar swirls at Mare Ingenii: A model for space we...

    • ...It is known that opaque materials mask the optical effects of space‐weathering products [Pieters et al., 2000]...

    Beth Ellen Clarket al. Spectroscopy of B-type asteroids: Subgroups and meteorite analogs

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