V41D:
Physical and Chemical Constraints on the Moon-Forming Impact I

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Session ID#: 18118

Session Description:
Recent hydrodynamic simulations of the Moon-forming impact have indicated that the mass of the impactor may not have been close to the “canonical” 0.15 ME but could have been, depending on initial conditions, between 0.05 and 0.5 ME. At the same time, geochemical and isotopic measurements increasingly show that Earth and Moon are virtually identical in a range of elemental isotopic compositions and trace element ratios. The outstanding problem now is how these different models and constraints can be reconciled to provide a coherent view of lunar formation. This may require post-impact vapor-phase equilibration of moon and protoEarth, or, alternatively, a narrow range of protoEarth and impactor compositions. The aim of this session is to bring together researchers concerned with the reconciliation of physical and chemical models of lunar origin. We are particularly interested in contributions which provide new data or which propose possible new constraints on the process.
Primary Convener:  Bernard J Wood, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Conveners:  Jon Wade, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, Rita Parai, Washington University in St Louis, Earth, Environmental, and Planetary Sciences, St. Louis, MO, United States and Stephen M Elardo, Carnegie Institution for Science Washington, Washington, DC, United States
Chairs:  Rita Parai, Washington University in St Louis, Earth, Environmental, and Planetary Sciences, St. Louis, MO, United States, Jon Wade, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom and Stephen M Elardo, Carnegie Institution for Science Washington, Washington, DC, United States
OSPA Liaison:  Jon Wade, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Index Terms:

1026 Composition of the moon [GEOCHEMISTRY]
1060 Planetary geochemistry [GEOCHEMISTRY]
5455 Origin and evolution [PLANETARY SCIENCES: SOLID SURFACE PLANETS]
6250 Moon [PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS]

Abstracts Submitted to this Session:

Accretion of the Moon after a High-Energy, High-Angular Momentum Giant Impact (Invited) (118833)
Sarah T Stewart1, Simon James Lock2, Michail I Petaev3, Zoë M Leinhardt4, Mia Mace4, Stein B Jacobsen5 and Matija Cuk6, (1)University of California, Earth and Planetary Sciences, Davis, United States, (2)Harvard University, Cambridge, MA, United States, (3)Harvard University, Department of Earth and Planetary Sciences, Cambridge, United States, (4)University of Bristol, Bristol, United Kingdom, (5)Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States, (6)SETI Institute Mountain View, Mountain View, CA, United States
The Age of the Moon (131799)
Melanie Barboni1, Patrick Boehnke1, C. Brenhin Keller2, Issaku E Kohl1, Kevin D McKeegan1, Blair Schoene2 and Edward D Young3, (1)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (2)Princeton University, Department of Geosciences, Princeton, NJ, United States, (3)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, United States
Pb-Pb systematics of lunar rocks: differentiation, magmatic and impact history of the Moon (Invited) (122457)
Alexander Nemchin1, Martin J Whitehouse2, Marc D Norman3, Joshua Snape2, Jeremy J Bellucci2 and Marion Grange1, (1)Curtin University, Perth, WA, Australia, (2)Swedish Museum of Natural History, Stockholm, Sweden, (3)Australian National University, Canberra, Australia
The Moon’s Slow Solidification: Reference Events and Timeline (Invited) (122103)
Linda T Elkins-Tanton, Arizona State University, School of Earth and Space Exploration, Tempe, AZ, United States
New K Isotopes Support the Moon Formed by a High Energy Giant Impact (136724)
Kun Wang, Washington University in St Louis, St. Louis, MO, United States and Stein B Jacobsen, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States
Volatile Loss from the Proto-Lunar Disk (139417)
Francis Albarede, Ecole Normale Supérieure Lyon, Laboratoire de Géologie de Lyon, Lyon, France
Siderophile Element Constraints on the Origin of the Moon (Invited) (119426)
Richard J Walker, University of Maryland College Park, Geology, College Park, MD, United States and James M Day, University of California San Diego, La Jolla, United States
Rubidium Isotope Composition of the Earth and the Moon: Evidence for the Origin of Volatile Loss During Planetary Accretion (171935)
Emily A Pringle and Frederic Moynier, Institut de Physique du Globe de Paris, Paris, France

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