45th Lunar and Planetary Science Conference (2014) sess614.pdf Tuesday, March 18, 2014 [T614] POSTER SESSION: THE CRATERING PROCESS: MECHANICS AND SCALING 6:00 p.m. Town Center Exhibit Area Hagerty J. J. Gaither T. A. POSTER LOCATION #138 Compositional Contradictions Recorded Within Impact-Generated Materials from Meteor Crater, Arizona: Implications for Crater Formation [#2397] Compositional analyses of impact-derived materials demonstrate that Meteor Crater is compositionally complex and therefore is far from a “simple” impact crater. Sommer F. D. Winkler R. Poelchau M. H. Deutsch A. Kenkmann T. POSTER LOCATION #139 Jetting in Experimental Impacts [#1804] The remnants of the jetting process of experimental impacts were collected. Glass-like spherules of micrometer size with varying composition were detected. Runyon K. D. Barnouin O. S. POSTER LOCATION #140 Experimental Ejecta Emplacement: Early Results [#1071] Initial experimental ejecta curtains and deposits appear similar to natural ejectas. Early results show high potential for erosion via ejecta emplacement. Anderson J. L. B. Cintala M. J. Johnson M. K. POSTER LOCATION #141 A Comparison of Crater-Size Scaling and Ejection-Speed Scaling During Experimental Impacts in Sand [#2668] We compare the results of crater-size scaling and ejection-speed scaling relationships as the projectile size and average grain size of the target are varied. Wasem J. V. Schill W. Owen J. M. POSTER LOCATION #142 A Combined Computational/Theoretical Approach to Extending Impact Scaling Formulas [#2557] We examine a combination of fundamental theory approaches and direct numerical simulation of impact events to extend impact scaling laws beyond leading order. Holsapple K. A. Housen K. R. POSTER LOCATION #143 Cratering in Blocky Regoliths [#2538] Craters in small bodies are largely unaffected by the presence of large blocky regoliths, even when the blocks are many times the impactor size. Housen K. R. Holsapple K. A. POSTER LOCATION #144 Momentum Transfer During Impacts into Rocky Rubble-Pile Asteroids [#2528] Impact experiments in granular materials determine the momentum delivered to the target. Momentum transfer is insensitive to the “coarseness” of the material. Krüger T. Sturm S. Kenkmann T. POSTER LOCATION #145 The Lunar Craters Bessel and Euler — Calculation of Ejecta Thickness and Structural Uplift for Complex Crater Rims [#1834] We investigated the lunar complex craters Euler and Bessel and calculated the ejecta thickness and structural uplift at their crater rims. Milbury C. Johnson B. C. Melosh H. J. Blair D. M. Collins G. S. POSTER LOCATION #146 The Effects of Porosity on Lunar Crater Formation and the Transition from Complex Crater to Peak Ring Basin Morphology [#2270] We model the transition from complex to peak-ring basin morphology using the iSALE hydrocode and report the effect of porosity on results of the simulations. 45th Lunar and Planetary Science Conference (2014) sess614.pdf Huang Y. H. Minton D. A. Richardson J. E. POSTER LOCATION #147 Modeling Topographic Changes by Ballistic Sedimentation from Orientale Ejecta [#2551] Energetic ejecta emplacement would alter lunar terrain significantly. A quantitative modeling of sedimentation process will help understanding this process. Vaughan W. M. Head J. W. POSTER LOCATION #148 Compositional Criteria for Identifying Impact Melt Sheets: Assessing the Bushveld Igneous Complex and the South Pole-Aitken Basin Floor [#2014] Compositional criteria (bulk composition, isotopic heterogeneity) can be used to identify impact melt sheets (IMS). The Bushveld Igneous Complex is not an IMS. Michael G. G. Basilevsky A. T. Kneissl T. Neukum G. POSTER LOCATION #149 Evolution of the Presence of Impact Melt at the Near-Surface of the Moon [#2410] We examine the long-term effect of the impact gardening process on the presence of impact melt of different ages at the near-surface of the Moon. Brown J. J. Thompson L. M. Spray J. G. POSTER LOCATION #150 Modification-Stage Tectonics Prior to Melt Sheet Emplacement: Constraints from the Manicouagan Impact Structure [#2255] Presence of a sedimentary cover to Precambrian metamorphic basement at the time of impact at Manicouagan allows us to constrain modification-stage tectonics. .