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Workshop on Early Solar System Impact Bombardment III :[B Program and Abstract Volume LPI Contribution No. 1826 Workshop on Early Solar System Impact Bombardment III February 4–5, 2015 • Houston, Texas Institutional Support Universities Space Research Association Lunar and Planetary Institute National Aeronautics and Space Administration NASA Solar System Exploration Research Virtual Institute (SSERVI) Conveners Dr. David Kring Lunar and Planetary Institute Dr. Robin Canup Southwest Research Institute Scientific Organizing Committee Simone Marchi Southwest Research Institute Kaveh Pahlevan Nice Observatory Ross Potter Lunar and Planetary Institute/Brown University Timothy Swindle University of Arizona Richard Walker University of Maryland Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 LPI Contribution No. 1826 Compiled in 2015 by Meeting and Publication Services Lunar and Planetary Institute USRA Houston 3600 Bay Area Boulevard, Houston TX 77058-1113 This material is based upon work supported by NASA under Award No. NNX08AC28A. Any opinions, findings, and conclusions or recommendations expressed in this volume are those of the author(s) and do not necessarily reflect the views of the National Aeronautics and Space Administration. The Lunar and Planetary Institute is operated by the Universities Space Research Association under a cooperative agreement with the Science Mission Directorate of the National Aeronautics and Space Administration. Material in this volume may be copied without restraint for library, abstract service, education, or personal research purposes; however, republication of any paper or portion thereof requires the written permission of the authors as well as the appropriate acknowledgment of this publication. Abstracts in this volume may be cited as Author A. B. (2014) Title of abstract. In Workshop on Early Solar System Impact Bombardment III, p. XX. LPI Contribution No. 1826, Lunar and Planetary Institute, Houston. ISSN No. 0161-5297 Preface This volume contains abstracts that have been accepted for presentation at the Workshop on Early Solar System Impact Bombardment III, February 4–5, 2015, Houston, Texas. Administration and publications support for this meeting were provided by the staff of the Meeting and Publication Services Department at the Lunar and Planetary Institute. Technical Guide to Sessions Wednesday, February 4, 2015 8:15 a.m. Lecture Hall Big Impacts and Their Chemical Consequences 1:15 p.m. Lecture Hall Chronology of Impacts 5:30 p.m. Great Room Poster Session: Early Solar System Bombardment Thursday, February 5, 2015 8:15 a.m. Lecture Hall Bombardment: Early and Late 1:30 p.m. Lecture Hall Consequences of Bombardment Early Solar System Impact Bombardment III v Contents Program ........................................................................................................................................................................ xi Lunar 40Ar/39Ar Step-Heating Data and the Late Heavy Bombardment P. Boehnke, M. T. Heizler, T. M. Harrison, O. M. Lovera, and P. H. Warren ................................................ 1 The Earliest Lunar Bombardment Produced by Moon-Forming Impact Ejecta W. F. Bottke, D. Vokrouhlicky, S. Marchi, A. Jackson, H. Levison, and T. Swindle ....................................... 3 Cosmochemical Fractionation by Collisional Erosion During the Earth’s Accretion A. Boujibar, D. Andrault, N. Bolfan-Casanova, and M. A. Bouhifd ................................................................ 5 Evolution of the Protolunar Disk: Dynamics, Cooling Timescale and Implantation of Volatiles into the Earth S. Charnoz and C. Michaut ............................................................................................................................. 7 What do Nectaris Basin Impact Melt Rocks Look Like and Where can We find Them? B. A. Cohen, N. E. Petro, and S. J. Lawrence ................................................................................................. 8 Lunar Zircons: What’s the Big Picture? C. A. Crow, K. D. McKeegan, and D. E. Moser ............................................................................................ 10 U-Pb Composition and Shock Microstructures of In-Situ Accessory Phases Across the Vredefort Impact Structure, South Africa: A Terrestrial Analogue for Dating the Lunar Surface and Other Planetary Bodies C. L. Davis and D. E. Moser ......................................................................................................................... 12 Impact Craters on Comets from a Granular Material Perspective D. de Niem and E. Kührt ............................................................................................................................... 14 Evidence Supporting an Early as Well as Late Heavy Bombardment of the Moon H. V. Frey ...................................................................................................................................................... 16 Reviewing “Terminal Cataclysm”: What Does it Mean? W. K. Hartmann ............................................................................................................................................ 18 Identifying the Geologic Context of Apollo 17 Aphanitic and Poikilitic Impact Melt Breccias D. Hurwitz and D. A. Kring ........................................................................................................................... 20 Potential Sample Sites for South Pole — Aitken Basin Impact Melt Within the Schrodinger Basin D. Hurwitz and D. A. Kring ........................................................................................................................... 22 Stop Hitting Yourself: Did most Terrestrial Impactors Originate from the Terrestrial Planets? A. P. Jackson, E. Asphaug, L. T. Elkins-Tanton, and D. A. Minton .............................................................. 24 Compositions of the Terrestrial Planets in the Grand Tack Model S. A. Jacobson, E. D. Young, D. C. Rubie, and A. Morbidelli ....................................................................... 25 The Density and Porosity of Lunar Impact Breccias and Impact Melt Rocks and Implications for Gravity Modeling of Impact Basin Structure W. S. Kiefer, R. J. Macke, D. T. Britt, A. J. Irving, and G. J. Consolmagno ................................................. 26 vi LPI Contribution No. 1826 Remnants of Early Archean Impact Events on Earth: New Studies on Spherule Layers from the Barberton Mountain Land, South Africa C. Koeberl, T. Schulz, S. Özdemir, T. Mohr-Westheide, W. U. Reimold, and A. Hofmann ........................... 28 Was an Epoch of Lunar Magmatism Triggered by the South Pole-Aitken Basin Impact? D. A. Kring, P. J. McGovern, R. W. K. Potter, G. S. Collins, M. L. Grange, and A. A. Nemchin ................................................................................................................. 30 The Terrestrial Record of an Extended Late Heavy Bombardment D. R. Lowe and G. R. Byerly ......................................................................................................................... 32 The Bombardment of the Earth During the Hadean and Early Archean Eras S. Marchi, W. F. Bottke, L. T. Elkins-Tanton, K. Wuennemann, A. Morbidelli, and D. A. Kring ...................................................................................................................... 34 Application of a New Method for Exploring the Copernican Cratering Record S. Mazrouei, R. R. Ghent, and W. F. Bottke .................................................................................................. 35 Pulses of Magma Movement Triggered by the South Pole-Aitken Impact P. J. McGovern, R. W. K. Potter, G. S. Collins, D. A. Kring, M. L. Grange, and A. A. Nemchin ................................................................................................................. 37 Debris from Borealis Basin Formation as the Primary Impactor Population of Late Heavy Bombardment D. A. Minton, A. P. Jackson, E. Asphaug, C. I. Fassett, and J. E. Richardson ............................................. 39 Zirconium Minerals from Mars, Moon and Earth Indicate Crustal ‘Refugia’ on Early Bombardment Surfaces D. E. Moser ................................................................................................................................................... 41 Destruction and Re-Accretion of Outer Solar System Satellites During the Late Heavy Bombardment N. Movshovitz, F. Nimmo, D. G. Korycansky, E. Asphaug, and J. M. Owen ................................................ 43 The Nature of the 4.2 Ga Impact Episode on the Moon: Evidence from North Ray Crater Breccias, Apollo 16 M. D. Norman................................................................................................................................................ 45 The Lunar Inclination as a Monitor of Late Stage Terrestrial Accretion K. Pahlevan and A. Morbidelli ...................................................................................................................... 47 Testing the Collisional Erosion Hypothesis for the Hadean Earth R. W. K. Potter and D. A. Kring .................................................................................................................... 49 Theian Orbital Evolution Amidst the Planetary Leftovers B. Quarles and J. J. Lissauer ........................................................................................................................ 51 Re-Evaluation of HSE Data in Light of High P-T Partitioning
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