41st Lunar and Planetary Science Conference (2010) sess453.pdf
Wednesday, March 3, 2010 IMPACTS ON THE MOON, MARS, AND BEYOND 1:30 p.m. Waterway Ballroom 5
Chairs: Mark Burchell Jamie Kimberley
1:30 p.m. Richardson J. E. * Thomas P. C. Uncovering the Saturnian Impactor Population via Small Satellite Cratering Records [#1523] We utilize a detailed cratered terrain evolution model to determine the size-frequency distribution of a common impactor population for three of the small Saturnian satellites, based upon their current crater density distributions.
1:45 p.m. Schmedemann N. * Galuba G. Neukum G. Denk T. Wagner R. Hartmann O. Size-Frequency Distributions (SFD) of Impact Craters on Saturnian Satellites and of the Body Diameters of Possible Impactors [#1989] This presentation is about the relationships between impact cratering on saturnian satellites, saturnian irregular satellites, Kuiper Belt objects and asteroids.
2:00 p.m. Shimaki Y. * Arakawa M. Yasui M. Experimental Study on the Collisional Disruption of Sintered Snowball with Various Porosity [#1630] We did impact experiments of sintered snowball with various porosity to study the re-accumulation process of icy bodies. We found that sticking occurred at the porosity larger than 60% and re- accumulation condition did not change with porosity.
2:15 p.m. Housen K. R. * Holsapple K. A. Asteroids Without Ejecta [#2354] Laboratory measurements show that target porosity reduces ejecta velocities. As a result, large craters on porous bodies can form without ejecta blankets.
2:30 p.m. Boyce J. M. * Barlow N. Mouginis-Mark P. M. Stewart S. T. Rampart Craters on Ganymede Europa, Mars and Earth: Implications for Layered (Fluidized) Ejecta Emplacement [#1444] Analysis of rampart craters on Ganymede, Europa, Mars and Earth suggests that none of the simple models for ejecta fluidization entirely fit the observed data.
2:45 p.m. Damptz A. L. * Glaze L. S. Baloga S. M. A New Analysis of Rampart Crater Ejecta Thickness Profiles on Mars [#1241] We provide quantitative characterization of rampart crater deposits. A key new measurement is the radial rampart thickness profile and shape. Results indicate rampart size and shape may be influenced by the composition of the impact target material.
3:00 p.m. Baloga S. M. * Fagents S. A. Glaze L. S. Mouginis-Mark P. J. Shallow-Wave Approach to Emplacement of Layered Crater Ejecta on Mars [#2294] A shallow-wave model for the overland flow of ejecta from impact craters on Mars is presented. The model provides a unifying framework for the formation of single, double, and multiple layer ejecta deposits.
3:15 p.m. Mouginis-Mark P. J. * Garbeil H. Geologic and Topographic Mapping of Tooting Crater, Mars, from HiRISE and CTX Data: Rim Slumping Controls the Distribution of Impact Melt, Pitted Terrain, Mudflows and Cavity Dewatering [#1497] CTX and HiRISE data of Tooting crater, Mars, reveal a strong link between ejecta volume, rim slumping, and the distribution of pitted terrain and floor fractures. Tooting provides a benchmark against which fresh large craters on Mars can be studied.
41st Lunar and Planetary Science Conference (2010) sess453.pdf
3:30 p.m. Nycz J. C. * Hildebrand A. R. Using HiRISE Digital Elevation Models to Investigate the Peripheral Peak Ring Morphology in the Martian Impact Crater Tooting [#1982] HiRiSE DEM’s were generated which cover the collapsed rim in the impact crater Tooting. These were used to palinspastically restore the crater rim, develop a model of rim failure, and numerically model the strength properties of the near subsurface.
3:45 p.m. Schwenzer S. P. * Abramov O. Allen C. C. Clifford S. Filiberto J. Kring D. A. Lasue J. McGovern P. J. Newsom H. E. Treiman A. Vaniman D. T. Wiens R. C. Wittmann A. Exploring Martian Impact Craters: What They Can Reveal About the Subsurface and Why They are Important in the Search for Life [#1589] On Noachian Mars, impact craters were frequent, could have penetrated an existing cryosphere and potentially hosted hydrothermal systems. Therefore, they are important targets to explore the subsurface and potential habitats on Noachian terrain.
4:00 p.m. Andrews-Hanna J. C. * Arabia Terra, Mars: A Partial Ring Structure Around the Borealis Basin and Implications for the Mechanism of Multi-Ring Basin Formation [#2615] A comparison of the topography of Arabia Terra with lunar and martian multiring basins suggests that Arabia Terra is a partial ring structure around the Borealis impact basin in the lowlands, and provides insight into the mechanism of ring formation.
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.
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.