Chip Shearer Institute of Meteoritics University of New Mexico

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Rationale for Workshop . Planetary differentiation is a fundamental early solar system process that in part dictates the evolutionary pathway followed by a planet. The last 15 years have seen a dramatic refinement of our understanding of the early evolution of planetary bodies.timescales over which differentiation occurred. increase in the sophistication of our understanding of orbital dynamics, accretion, and mechanisms of the differentiation process.a broader perspective of planetary diffe32255

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Chip Shearer Institute of Meteoritics University of New Mexico

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1. Chip Shearer Institute of Meteoritics University of New Mexico

2. Rationale for Workshop Planetary differentiation is a fundamental early solar system process that in part dictates the evolutionary pathway followed by a planet. The last 15 years have seen a dramatic refinement of our understanding of the early evolution of planetary bodies. timescales over which differentiation occurred. increase in the sophistication of our understanding of orbital dynamics, accretion, and mechanisms of the differentiation process. a broader perspective of planetary differentiation derived by contrasting planetary settings (Earth, Moon, Mars, asteroids). The goal of this workshop was to integrate these advances into a richer understanding of the earliest stages of planetary evolution. Important scientific theme for lunar exploration.

3. Conveners Chip Shearer Institute of Meteoritics, University of New Mexico Lars Borg Lawrence Livermore National Labs Kevin Righter Johnson Space Center.

4. Program Committee Craig Agnor University of California,Santa Cruz Linda Elkins-Tanton Brown University Walter Kiefer Lunar and Planetary Institute Jay Melosh University of Arizona Meenakshi Wadhwa,    Arizona State University Richard Walker,    University of Maryland

5. Workshop Sponsors Lunar and Planetary Institute NASA Mars Exploration Office  Curation and Analysis Planning Team for Extraterrestrial Materials (CAPTEM)

6. Summary of Workshop Doubletree Hotel Sonoma, Sonoma County California. December 7-10 2006 Reception December 7 5 Technical Sessions December 8-10 Evening poster session December 8 85 Registered Attendees. 10 Students Most from US, several from Europe and Asia.

7. Workshop Themes Early Differentiation, an overview from a planetary perspective. Accretion and the initial conditions of the terrestrial planets. Timescales of early planetary differentiation. Mechanisms of silicate differentiations. Dynamic, isotopic, and experimental constraints for core formation.

8. Invited Speakers I Early Differentiation, an overview from a planetary perspective. Dave Stevenson (Caltech) Early Planetary Differentiation. Mike Drake (University of Arizona) The Vesta-HED meteorite connection. Lars Borg (LLNL) The differentiation history of Mars inferred from the isotopic study of SNC meteorites. Chip Shearer (UNM) Remnants of a magma ocean, Insights into the differentiation of the Moon and relevance to the terrestrial planets. Accretion and the initial conditions of the terrestrial planets. Hal Levison (SWRI) Terrestrial planet formation, Timescales and modeling results. Francis Nimmo (University of California,Santa Cruz) Observational and theortical constraints on the initial temperature structure of the terrestrial planets.  

9. Invited Speakers II Timescales of early planetary differentiation. T Kleine (ETH Zurich) Tungsten isotope constraints on core formation in the terrestrial planets. Stein Jacobson (Harvard) Isotopic constraints on the time scales of Earth’s differentiation. Mark Harrison (UCLA) The Hadean Earth. Mechanisms of silicate differentiations. Rick Carlson (DTM) Early planetary differentiation: Unmixing and remixing planetary interiors. Mark Walter (University of Bristol) Exploring the geochemical consequences of magma ocean differentiation. Dynamic, isotopic, and experimental constraints for core formation. Nancy Chabot (JHU-APL) Experimental constraints on Planetary core formation in an early magma ocean.

10. Examples of Mars related presentations Differentiation of Mars The differentiation history of Mars inferred from the isotopic study of SNC meteorites. Timescales of the early differentiation of Mars. Water on Mars. Behavior of water during accretion and early differentiation. What controlled the rate of crustal differentiation on early Mars? New, geophysically constrianed martian mantle compositions. Siderphile element constraints on the depth and extent of melting on early Mars. Duration of lunar differentiation and similarities to early Mars.

11. Examples of Mars related presentations Comparisons between Mars and the other terrestrial planets Remnants of a magma ocean, Insights into the differentiation of the Moon and relevance to the terrestrial planets. Early Planetary differentiation: Comparative planetology. Redox control of S among the terrestrial planets. Observational and theortical constraints on the initial temperature structure of the terrestrial planets. Late accretional histories of the Earth, Moon, and Mars. Giant impacts and terrestrial planet evolution. Linked magma ocean solidification and atmospheric growth. Mars vs Moon. The effects of length scales and initial composition on Planetary differentiation.

12. Examples of important results Planetary differentiation is an early and rapid process. Perhaps contemporary with CAI and chondrule formation. Both the Moon, Mars, and EPB experienced differentiation through rapid crystallization of a magma ocean (10-50 my). Secondary crustal formation (granites) and stability of water on the Earth’s surface occurred early (4.45 Ga). Is this relevant to Mars?

13. Examples of important results Different styles of accretion (i.e. Moon vs Mars) will influence extent of melting and number of magma oceans. Considerable differences in W and Sm isotopic systematics between Mars and Moon.

14. Examples of important results P-T-H2O of magma ocean crystallization had a substantial effect on Nature of primary planetary crusts. Post-magma ocean additions to the mantle via late-stage accretion. Atmospheric evolution.

15. Future observations for a better understanding planetary differentiation. Develop further linkages between observations and models. Magma ocean crystallization. Giant impact models. Multiple magma oceans. Nature of planetary interiors (geophysical networks). Exploration and sampling of preserved primary planetary crusts. Moon = FANs 4 Vesta = basalts Mars = ancient terrains.

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