Saturday, February 27, 2010

LPSC-XLI (2010)-The Moon, Wed., March 3

8:30 a.m. Waterway Ballroom 6
Chairs: Joshua Bandfield
Roy Christoffersen

8:30 a.m. Noble S. K. * Examining the Uppermost Surface of the Lunar Regolith [#1505] Understanding the properties of the uppermost surface of the lunar regolith is critical as it is the surface that is probed by remotely-sensed data. Our initial results suggest this surface may be enriched in ultra-fine grains.

10:45 a.m. Christoffersen R. * Keller L. P. Dukes C. Rahman Z. Baragiola R. Experimental Investigation of Space Radiation Processing in Lunar Soil Ilmenite: Combining Perspectives from Surface Science and Transmission Electron Microscopy [#1532] The effect of space radiation processing on lunar ilmenite has been investigated using combined XPS in situ irradiation and surface analysis and FE-STEM imaging and analysis.

X-ray ultramicrographs of opaque glassy particles with ellipsoid, teardrop and dumb-bell morphologies.

11:00 a.m. Kiely C. * Kiely C. J. An X-Ray Ultramicroscopy Study of Apollo 11 Lunar Regolith [#1118] Sub-micron resolution images of the internal structure (using X-ray ultramicroscopy) and external morphology (using SEM) of lunar regolith particles will be presented side-by-side. Rotational movies of individual particles will also be shown.

11:15 a.m. Chen S. B. * Meng Z. G. Lunar Regolith Depth Measurement by Passive Microwave Radiometer Onboard Chang’e Orbiter [#1632] The lunar regolith depths are retrieved by passive microwave radiometer onboard Chang’e Orbitor, China.

11:30 a.m. Wang Z. * Li Y. Jiang J. Li J. A Estimation of The Lunar Surface Temperature, Dielectric Constant, Regolith Thickness and Helium-3 Content Retrieved from Brightness Temperature by CE-1 Microwave Sounder [#1124] CEMLS is the first passive microwave radiometer on lunar orbit. The method of retrieving lunar surface geophysical parameters are discussed, and the retrievals of surface temperature, dielectric
constant, regolith thickness and He3 content are given.

Typical impact melt pool and proximal ejecta on the SE rim of Jackson crater in LROC NAC M103216633L. A crater at the boundary between this melt pool and the ejecta blanket is ~20% larger on the ejecta blanket than on the melt pool. This suggests a difference in the target properties of these two units. Figure 1 from 2165, Below)

1:30 p.m. Waterway Ballroom 5

4:15 p.m. van der Bogert C. H. * Hiesinger H. McEwen A. S. Dundas C. Bray V. Robinson M. S. Plescia J. B. Reiss D. Klemm K. LROC Team - Discrepancies Between Crater Size-Frequency Distributions on Ejecta and Impact Melt Pools at Lunar Craters: An Effect of Differing Target Properties? [#2165] We measured CSFDs for the lunar crater Jackson. The impact melt pools and ejecta have model ages of 85 Ma and 150 Ma, respectively. We show the discrepancy may be explained by differences in target properties, rather than an actual age difference.

Swirled melt pool on the floor of Giordano Bruno. Arrow marks the slump direction of material from the crater wall, a possible trigger for circulation in the melt pool. North is right.

4:30 p.m. Bray V. J. * Tornabene L. L. Caudill C. Rizk B. McEwen A. S. Hawke B. R. Giguere T. A. Garry W. B. Kestay L. van der Bogert C. H. Robinson M. LROC Team Impact Melt Movement in Lunar Craters [#2371] We are conducting mapping and analysis of small-scale flows, ponds and veneers in lunar craters to help us piece together the distribution, timing of emplacement, and cooling histories of different types of melt deposits.

Differences between familiar near side lunar seas Serenitatis and Tranquillitatis are brought to the surface in a stark demonstration of a wide variation in morphology over time. Fig.2 from SPECTROSCOPIC SIGNATURE OF THE HIGH TITANIUM BASALTS AT MARE TRANQUILLITATIS FROM MOON MINERALOGY MAPPER M3 (Chandrayaan M3) (#2494) 1000 nm integrated band depth image for Mare Traquillitatis and nearby areas.

1:30 p.m. Waterway Ballroom 6
Chairs: Peter Isaacson
Noah Petro

1:30 p.m. Greenhagen B. T. * Lucey P. G. Glotch T. D. Bandfield J. L. Allen C. C. Bowles N. E. Thomas I. R. Wyatt M. B. Donaldson Hanna K. L. Paige D. A. Global Distribution of Lunar Silicates from the Diviner Lunar Radiometer [#2382] The Diviner lunar radiometer has made the first direct global measurement of silicate mineralogy of the lunar surface using multispectral thermal emission mapping. We have found exposures of unusual lithologies and a lack of olivine-rich mantle materials.

1:45 p.m. Glotch T. D. * Lucey P. G. Bandfield J. L. Greenhagen B. T. Thomas I. R. Elphic R. C. Bowles N. E. Wyatt M. B. Allen C. C. Donaldson Hanna K. L. Paige D. A. Identification of Highly Silicic Features on the Moon [#1780] Diviner has detected several features on the Moon with highly silicic compositions. These geologic settings of these features suggest formation of highly evolved lithologies from both extrusive volcanic and intrusive processes.

2:00 p.m. Lucey P. G. * Paige D. A. Greenhagen B. T. Bandfield J. L. Glotch T. D. Comparison of Diviner Christiansen Feature Position and Visible Albedo: Composition and Space Weathering Implications [#1600] Diviner finds that the Christiansen Feature is correlated with visible albedo. This indicates that terrains of similar albedos share similar mafic mineral contents; major variations in Mg are not indicated.

2:15 p.m. Donaldson Hanna K. L. * Wyatt M. B. Paige D. A. Greenhagen B. T. Head J. W. Pieters C. M. Lunar Mare Basalts: Insights Using Diviner Thermal Infrared Data [#2396] Thermal infrared data from the Diviner Lunar Radiometer Experiment on the LRO is used to make regional maps of derived compositions and thermophysical properties. In this preliminary study, measurements of the lunar maria are analyzed to see what insight they provide.

2:30 p.m. Isaacson P. J. * Pieters C. M. Clark R. N. Head J. W. Klima R. L. Petro N. E. Staid M. I. Sunshine J. M. Taylor L. A. Thaisen K. G. Tompkins S. Remote Compositional Analyses of Lunar Olivine-rich Lithologies Using Moon Mineralogy Mapper (M3) Data [#1809] We have applied techniques developed for laboratory spectra of lunar olivines to spectra collected by M3. Our work suggests that the olivines analyzed to date are more Fe-rich than those in primitive Mgsuite rocks from the Apollo collection.

2:45 p.m. Dhingra D. * Pieters C. M. Isaacson P. Staid M. Mustard J. Klima R. Taylor L. A. Kramer G. Nettles J. M3 Team Spectroscopic Signature of the High Titanium Basalts at Mare Tranquillitatis from Moon Mineralogy Mapper (M3) [#2494] High-Ti basalts at Mare Tranquillitatis have been studied using M3 data to explore spectral effects of ilmenite utilizing near IR properties. The results from Mare Tranquillitatis are compared with low-Ti basalts at Mare Serenitatis.

3:00 p.m. Yamamoto S. * Nakamura R. Matsunaga T. Ogawa Y. Ishihara Y. Morota T. Hirata N. Ohtake M. Hiroi T. Yokota Y. Haruyama J. Global Distribution of Olivine Exposures on the Moon Revealed by SELENE Spectral Profiler [#1646] Here, we report the global distribution of olivine exposures, possibly originating from the lunar mantle as discovered by Spectral Profiler onboard the Japanese lunar explorer SELENE (Kaguya).

3:15 p.m. Bugiolacchi R. * Mall U. Bhatt M. McKenna-Lawlor S. A Fresh Look at the Copernicus Crater Central Peak Region Through High-Resolution NIR Data from the SIR-2 Instrument on Chandrayaan-1 [#1609] We looked at the NIR reflectance spectral characteristics of surface materials in the central peaks region of the Copernicus crater using high spectral and spatial resolution data from the SIR-2 instrument on board of the Chandrayaan-1 lunar mission.

Figure 1. 2.85 μm images of M3 observations M3G20090209T054030 and M3G20090209T072710

3:30 p.m. Mustard J. F. * Pieters C. M. Isaacson P. J. Head J. W. Klima R. L. Petro N. E. Staid M. Sunshine J. M. Runyon C. Taylor L. A. Compositional Characteristics of the Aristarchus Crater from (M3) Data [#2000] Aristarchus Crater, astride a mare-highland contact, exposes diverse mineralogy in a region of extensive rilles and dark mantle deposits. Here we show the first results of compositional diversity for Aristarchus Crater as seen from M3.

3:45 p.m. Klima R. L. * Pieters C. M. Isaacson P. J. Head J. W. Staid M. Taylor L. A. Petro N. E. Sunshine J. M. Global Distribution and Composition of Low-Ca Pyroxenes on the Moon as Viewed by the Moon Mineralogy Mapper [#1485] High spectral and spatial resolution Moon Mineralogy Mapper (M3) data is enabling quantitative characterization of pyroxene composition on the lunar surface. We present results of a global survey of low-Ca pyroxenes, focusing on their Mg-Fe ratios.

4:00 p.m. Riner M. A. * Lucey P. G. Neumann G. A. Mazarico E. Mapping Low-Calcium Pyroxene Using LOLA [#2292] LOLA is not commonly thought to be a mineralogic sensor, but its data can be used to map the relative abundance of magnesian low-calcium pyroxene through detection of changes in spectral reflectance with temperature.

4:15 p.m. Nettles J. W. * Besse S. Boardman J. Combe J-Ph. Clark R. Dhingra D. Isaacson P. Klima R. Kramer G. Petro N. E. Pieters C. M. Staid M. Taylor L. A. Progress Toward A New Lunar Optical Maturity Measure Based on Moon Mineralogy Mapper (M3) Data [#2217] Efforts are ongoing to leverage the high spectral resolution and coverage of M3 data to produce a new optical maturity index that better estimates the effects of space weathering on lunar spectra.

4:30 p.m. Hendrix A. R. * Vilas F. Retherford K. D. Gladstone G. R. Ultraviolet Spectroscopy of the Moon: Clues About Composition and Weathering [#2451] We present results from a study combining several UV lunar data sets, including IUE, Galileo and LRO/LAMP, to investigate compositional variations and weathering effects across the surface of the Moon.

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