^1,2Aaron Z. Goldberg, ^1,3James E. Owen,^1,4Emmanuel Jacquet
¹Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto M5S 3H8, Canada
²Department of Physics and Astronomy, McMaster University, 1280 Main Street W., Hamilton, Ontario L8S 4M1, Canada
³Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA
⁴Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Muséum National d’Histoire Naturelle, CP52, 57 rue Buffon, F-75005 Paris, France

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Reference
Goldberg AZ, Owen JE, Jacquet E (2015) Chondrule transport in protoplanetary discs. Monthly Notices of the Royal Astronomical Society 452, 4054-4069.
Link to Article [doi: 10.1093/mnras/stv1610]

^1,2Alan E. Rubin, ³John P. Breen, ^1,2,3John T. Wasson, ⁴Darryl Pitt
¹Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California, USA
²Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California, USA
³Department of Chemistry and Biochemistry, University of California, Los Angeles, California, USA
⁴Macovich Collection of Meteorites, New York City, New York, USA

A slab of the Willamette ungrouped iron contains elongated troilite nodules (up to ~2 × 10 cm) that were crushed and penetrated by wedges of crushed metal during a major impact event. What makes this sample unique is the contrast between the large amount of shock damage and the very small (~1%) amounts of shock melting in the large troilite nodules. The postshock temperature was low, probably ≾960 °C. The Widmanstätten pattern has been largely obscured by an episode of postshock annealing that caused recrystallization of the kamacite. The shock and thermal history of Willamette includes (1) initial crystallization and formation of multicentimeter-size troilite nodules from trapped melt, (2) impact-induced melting of metal-sulfide assemblages to form lobate taenite masses a few hundred micrometers in size, (3) impact-crushing of the nodules and jamming of metal wedges into them, (4) simultaneous crushing of metal grains adjacent to sulfide throughout the meteorite, (5) postshock annealing causing minor recrystallization of metal and troilite, and (6) a late-stage shock event (and additional annealing) producing Neumann lines in the kamacite.

Reference
Rubin AE, Breen JP, Wasson JT, Pitt D (2015) Shock effects in the Willamette ungrouped iron Meteorite. Meteoritics & Planetary Science (in Press)
Link to Article [DOI: 10.1111/maps.12569]
Published by arrangement with John Wiley & Sons