Iron and Titanium Abundance and Maturity Degree Distribution on the Lunar Nearside

Shkuratov, Yurij G.; Kaydash, V. G.; Opanasenko, N.V.

doi:10.1006/icar.1999.6046

Cited by 87 publications

(68 citation statements)

References 12 publications

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“…It was later thought that extending the VIS range to longer wavelengths (e.g., ∼750 nm) might improve the measurement accuracy (e.g., Johnson and Singer 1991). More advanced methods of optimization were used by Blewett et al (1997), Lucey et al (1998Lucey et al ( , 2000, and by Shkuratov et al (1999a) to map the estimated variation of TiO 2 across the Moon. Various causes of this empirical relation between UV/VIS color and TiO 2 have been proposed (Pieters 1993, Pieters et al 1993b, Lucey et al 2000.…”

Section: Correlation Between Composition and Spectral Ratiosmentioning

confidence: 99%

See 1 more Smart Citation

Statistical Analysis of the Links among Lunar Mare Soil Mineralogy, Chemistry, and Reflectance Spectra

Pieters

Stankevich²,

Shkuratov³

et al. 2002

Icarus

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Section: Correlation Between Composition and Spectral Ratiosmentioning

confidence: 99%

“…(e.g., Adams 1974, Charette et al 1974, Pieters 1978, Johnson and Singer 1991, Jaumann 1991, Lucey et al 1995, 1998, Shkuratov et al 1999a. A challenge in such efforts is also to accommodate the influence of alteration in the space environment and the effects of soil maturity on optical properties.…”

Section: Introductionmentioning

confidence: 98%

Statistical Analysis of the Links among Lunar Mare Soil Mineralogy, Chemistry, and Reflectance Spectra

Pieters

Stankevich²,

Shkuratov³

et al. 2002

Icarus

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“…In the following years, many researchers worked on improving and refining the mathematical algorithms (Johnson et al 1985(Johnson et al , 1991Blewett et al 1997;Lucey et al 1998Lucey et al , 2000Gillis and Jolliff 2001;Gillis et al 2003Gillis et al , 2004. Others conducted parallel research on the photometric properties of the Moon's surface (e.g., Fisher and Pieters 1996;Shkuratov et al 1999;Kreslavsky et al 2000) by experimenting on various lunar samples, adding to the work of the Hawai'ian group (Lucey and co-workers).…”

Section: Derivation Of Tio 2 Mapsmentioning

confidence: 99%

Stratigraphy and composition of lava flows in Mare Nubium and Mare Cognitum

Bugiolacchi

Spudis

Guest

2006

Meteorit & Planetary Scien

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Abstract-Three major periods of basaltic activity characterize the infill of the basins. Each of these periods was itself punctuated by discrete phases of widespread magma eruptions: three during both the Late Imbrian Epoch and the early Eratosthenian Period and then two in the late Eratosthenian Period. We found the youngest lavas off the eastern border of the Fra Mauro peninsula and, mantling a much larger area, over most of the central western Nubium basin. Our results place the Nubium/Cognitum basalts in the low-Ti category (1-5 wt% TiO 2 ).The data indicate that the majority (~90%) of the mare terrain has iron content between 18 and 22 wt%. In particular, FeO contents tend to concentrate toward two compositional poles, each of ∼20 wt%, and a much smaller one of ∼15 wt%. These values are typical of nearside lunar maria.To complement our compositional data, we present a census of craters larger than 500 m using Orbiter IV images. The result was a crater count average with frequency 5.6 × 10 −2 km −2 , translating into an inferred mean age of 3300 Ma for the exposed lava flows.By combining lava chemistry with age, we find a possible correlation between the ages of the most prominent flow units and their estimated titanium content, with younger basalts becoming progressively Ti-richer with time (from 2-3 to 4-5 wt% TiO 2 ).

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“…Some issues of the photometric calibration of Clementine global image data were discussed by Hillier et al (1999) and Shkuratov et al (2000). They found a brightness difference between Clementine and Earth-based data, such that the Clementine calibration is about a factor two brighter.…”

Section: Discussionmentioning

confidence: 99%

Albedo–color distribution on Mercury

Warell¹,

Valegård²

2006

A&A

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Aims. The variation of albedo and color of Mercury's surface is studied with disk-resolved image data obtained at six evenly spaced wavelengths in the optical to near infrared wavelength range (447-944 nm) with the 1-m Swedish Solar Telescope on La Palma in April, 2003. Methods. Disk images have been modeled and photometrically normalized with the light scattering theory of Hapke to derive albedocolor properties of a poorly known region (unimaged by Mariner 10) of Mercury's surface between longitudes 210• W and 270• W. Maps of relative abundances of ferrous iron, titanium and optical maturation are derived on the basis of a feldspathic model for the crustal composition and previous results for the Moon, assuming the validity of the general maturation model for mafic silicate regoliths of atmosphereless bodies. Results. The albedo-color scatterplot distributions of Mercury's surface are uniform with respect to wavelength in the near-ultraviolet to near-infrared due to the absence of strong absorption bands in the reflectance spectrum. The extents of the distributions are less than for the global Moon and similar to that of the lunar farside, which is related to the relatively subdued color contrasts of Mercury's primarily feldspathic surface. At the attained 500-km spatial resolution scale, these maps do not indicate the existence of surface regions chemically similar to the lunar maria, which have a high FeO and TiO 2 content. Variations in abundances of ferrous iron and titanium are shown to be less than for the global Moon and similar to the lunar farside at the same spatial scale. Optically bright regions on Mercury are less mature and less opaque than their surroundings consistent with geologically recent immature crater ejecta, while localized dark regions generally have intermediate maturities and iron abundances and higher-than-average titanium abundances. The smaller relative intensity range of spatial variations of spectral parameters in the near infrared compared to the near ultraviolet may imply that relative abundance variations in ferrous iron are smaller than variations in opaque minerals. Conclusions. The results reinforce the similar natures of the Mariner 10-imaged and the poorly known hemispheres of Mercury, as well as their superficial similarity to the lunar farside, and demonstrate that geological interpretation of ground-based observations of albedo features on Mercury is possible.

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Iron and Titanium Abundance and Maturity Degree Distribution on the Lunar Nearside

Cited by 87 publications

References 12 publications

Statistical Analysis of the Links among Lunar Mare Soil Mineralogy, Chemistry, and Reflectance Spectra

Statistical Analysis of the Links among Lunar Mare Soil Mineralogy, Chemistry, and Reflectance Spectra

Stratigraphy and composition of lava flows in Mare Nubium and Mare Cognitum

Albedo–color distribution on Mercury

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