Earth-based radar data reveal extended deposits of the Moon's Orientale basin

Ghent, R. R.; Campbell, B. A.; Hawke, B. R.; Campbell, D. B.

doi:10.1130/g24325a.1

Cited by 23 publications

(23 citation statements)

References 14 publications

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“…The ratio of SC to OC echoes, termed the circular polarization ratio (CPR), provides enhanced sensitivity to scattering from blocks suspended in the upper several meters of the regolith. In 70-cm wavelength images, radar-dark haloes show low OC and SC returns and low CPR values, indicating depletion in blocks or boulders capable of scattering the incident energy -i.e., blocks about 1/10 the wavelength or larger in diameter (7 cm) -within the radar penetration depth (Ghent et al, 2005(Ghent et al, , 2008Thompson et al, 2006). Fig.…”

Section: Radar-dark Haloes On the Moonmentioning

confidence: 99%

Generation and emplacement of fine-grained ejecta in planetary impacts

Ghent

Gupta

Campbell

et al. 2010

Icarus

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Section: Radar-dark Haloes On the Moonmentioning

confidence: 99%

Generation and emplacement of fine-grained ejecta in planetary impacts

Ghent

Gupta

Campbell

et al. 2010

Icarus

Self Cite

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“…Some ejecta was undoubtedly deposited at larger radial ranges than we measure [e.g., Spudis, 1993;Ghent et al, 2008], but it is likely to be a small percentage of the total ejecta volume because it commonly occurs in radial chains and is discontinuous.…”

Section: Ejecta Volumes and Comparisons To Estimated Transient Rim Crmentioning

confidence: 99%

Thickness of proximal ejecta from the Orientale Basin from Lunar Orbiter Laser Altimeter (LOLA) data: Implications for multi-ring basin formation

Fassett

Head

Smith

et al. 2011

Geophys. Res. Lett.

116

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Quantifying the ejecta distribution around large lunar basins is important to understanding the origin of basin rings, the volume of the transient cavity, the depth of sampling, and the nature of the basin formation processes. We have used newly obtained altimetry data of the Moon from the Lunar Orbiter Laser Altimeter (LOLA) instrument to estimate the thickness of ejecta in the region surrounding the Orientale impact basin, the youngest and best preserved large basin on the Moon. Our measurements yield ejecta thicknesses of ∼2900 m near the Cordillera Mountains, the topographic rim of Orientale, decaying to ∼1 km in thickness at a range of 215 km. These measurements imply a volume of ejecta in the region from the Cordillera ring to a radial range of one basin diameter of ∼2.9 × 106 km3 and permit the derivation of an ejecta‐thickness decay model, which can be compared with estimates for the volume of excavation and the size of the transient cavity. These data are consistent with the Outer Rook Mountains as the approximate location of the transient cavity's rim crest and suggest a volume of ∼4.8 × 106 km3 for the total amount of basin ejecta exterior to this location.

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“…Finer material corresponds to an increasing fraction of the total ejecta volume with increasing distance from the crater. Therefore, ejecta are generally darker as distance increases from the crater 35 . Thus based on the radar response for surface roughness, the ejecta have been categorized into two tonal variations.…”

Section: Ejecta Extent Measurementsmentioning

confidence: 99%

Impact Ejecta Characterization for Small-Sized Fresh and Degraded Lunar Craters Using Radar Data

2016

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Ejecta distribution studies for large-sized (>10 km) lunar craters have been carried out earlier, but similar studies on smaller craters are lacking mainly due to data resolution limitations. Here we present a detailed quantification on spatial deposition of ejecta for small-sized lunar craters (<6 km). Using data from Mini RF instrument on-board NASA's Lunar Reconnaissance Orbiter, four Stokes parameters that differentiate and describe the observed backscattered electromagnetic field are calculated. We use the first Stokes parameter to investigate and estimate the spatial ejecta distribution for 98 small-sized fresh and degraded craters from mare and highland regions. It is observed that ejecta distribution can be described using power law with crater diameter and depth/ diameter (d/D) ratio. Ejecta behaviour is analysed for both the terrain types, highland and mare, enabling us to understand the effect and dependency of target rock properties on the ejecta characteristics. Further, the d/D dependence has indicated that the relative degradation rate appears higher for highland region compared to mare region.

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Earth-based radar data reveal extended deposits of the Moon's Orientale basin

Cited by 23 publications

References 14 publications

Generation and emplacement of fine-grained ejecta in planetary impacts

Generation and emplacement of fine-grained ejecta in planetary impacts

Thickness of proximal ejecta from the Orientale Basin from Lunar Orbiter Laser Altimeter (LOLA) data: Implications for multi-ring basin formation

Impact Ejecta Characterization for Small-Sized Fresh and Degraded Lunar Craters Using Radar Data

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