| Literature DB >> 17170295 |
Michael E Zolensky1, Thomas J Zega, Hajime Yano, Sue Wirick, Andrew J Westphal, Mike K Weisberg, Iris Weber, Jack L Warren, Michael A Velbel, Akira Tsuchiyama, Peter Tsou, Alice Toppani, Naotaka Tomioka, Kazushige Tomeoka, Nick Teslich, Mitra Taheri, Jean Susini, Rhonda Stroud, Thomas Stephan, Frank J Stadermann, Christopher J Snead, Steven B Simon, Alexandre Simionovici, Thomas H See, François Robert, Frans J M Rietmeijer, William Rao, Murielle C Perronnet, Dimitri A Papanastassiou, Kyoko Okudaira, Kazumasa Ohsumi, Ichiro Ohnishi, Keiko Nakamura-Messenger, Tomoki Nakamura, Smail Mostefaoui, Takashi Mikouchi, Anders Meibom, Graciela Matrajt, Matthew A Marcus, Hugues Leroux, Laurence Lemelle, Loan Le, Antonio Lanzirotti, Falko Langenhorst, Alexander N Krot, Lindsay P Keller, Anton T Kearsley, David Joswiak, Damien Jacob, Hope Ishii, Ralph Harvey, Kenji Hagiya, Lawrence Grossman, Jeffrey N Grossman, Giles A Graham, Matthieu Gounelle, Philippe Gillet, Matthew J Genge, George Flynn, Tristan Ferroir, Stewart Fallon, Sirine Fakra, Denton S Ebel, Zu Rong Dai, Patrick Cordier, Benton Clark, Miaofang Chi, Anna L Butterworth, Donald E Brownlee, John C Bridges, Sean Brennan, Adrian Brearley, John P Bradley, Pierre Bleuet, Phil A Bland, Ron Bastien.
Abstract
The bulk of the comet 81P/Wild 2 (hereafter Wild 2) samples returned to Earth by the Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains, with occasional much larger (over 1 micrometer) ferromagnesian silicates, Fe-Ni sulfides, Fe-Ni metal, and accessory phases. The very wide range of olivine and low-Ca pyroxene compositions in comet Wild 2 requires a wide range of formation conditions, probably reflecting very different formation locations in the protoplanetary disk. The restricted compositional ranges of Fe-Ni sulfides, the wide range for silicates, and the absence of hydrous phases indicate that comet Wild 2 experienced little or no aqueous alteration. Less abundant Wild 2 materials include a refractory particle, whose presence appears to require radial transport in the early protoplanetary disk.Entities:
Year: 2006 PMID： 17170295 DOI： 10.1126/science.1135842
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728