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6 results on '"Franchi, I"'

1. Comet 81P/Wild 2 Under a Microscope

Author

Brownlee, Don, Tsou, Peter, Aleon, Jerome, Alexander, Conel M O'D, Araki, Tohrú, Bajt, Sasa, Baratta, Gisuseppe A, Bastien, Ron, Bland, Phil, Bleuet, Pierre, Ziegler, Karen, Zimmerman, Laurent, Zinner, Ernst, Zolensky, Michael, Bullock, E, Burchell, Mark J, Busemann, Henner, Butterworth, Anna, Chaussidon, Marc, Cheuvront, Allan, Lyon, Ian, Chi, Miaofang, Cintala, Mark J, Clark, B. C., Clemett, Simon J, Cody, George, Colangeli, Luigi, Cooper, George, Cordier, Patrick, Daghlian, C, Dai, Zurong, MacPherson, Glen, D'Hendecourt, Louis, Djouadi, Zahia, Dominguez, Gerardo, Duxbury, Tom, Dworking, Jason P, Ebel, Denton S, Economou, Thanasis E, Fakra, Sirine, Fairey, Sam A J, Fallon, Stewart, Marcus, Matthew A, Ferrini, Gianluca, Ferroir, T, Fleckenstein , Holger, Floss, Christine, Flynn, George, Franchi, I., Fries, Marc, Gainsforth, Z, Gallien, J P, Genge, Matt, Marhas, Kukjeet, Gilles, Mary K, Gillet, Phillipe, Glavin, Daniel P, Gounelle, Matthieu, Grady, Monica M, Graham, Giles A, Grant, P.G., Green, Simon F, Grossemy, Faustine, Grossman, L, Marty, Bernard, Grossman, Jeffrey N, Guan, Yunbin, Hagiya, Kenji, Harvey, Ralph, Heck, Philipp, Herzog, Gregory F, Hoppe, Peter, Horz, Friedrich, Huth, Joachim, Hutcheon, Ian D, Matrajt, Graciela, Ignatyev, Konstantin, Ishii, Hope, Ito, Motoo, Jacob, Damien, Jacobsen, Chris, Jacobsen, Stein, Jones, Steven B, Joswiak, David, Jurewicz, Amy, Kearsley, Anton T, McKeegan, Kevin D, Keller, Lindsay P, Khodja, H, Kilcoyne, A.L. David, Kissel, Jochen, Krot, Alexander, Langenhorst, F, Lanzirotti, A, Le, Loan, Leshin, Laurie A, Leitner, J, Meibom, Anders, Lemelle, Laurence, Leroux, Hughues, Liu, Ming-chang, Luening, K, Mennella, Vito, Messenger, Keiko, Borg, Janet, Messenger, Scott, Mikouchi, Takashi, Mostefaoui, Smail, Nakamura, Tomoki, Nakano, T, Newville, Matthew, Nittler, Larry R, Ohnishi, Ichiro, Ohsumi, Kazumasa, Okudaira, Kyoko, Bradley, John P, Papanastassiou, Dimitri, Palma, Russ, Palumbo, Maria, Pepin, Robert, Perkins, David, Perronnet, Murielle, Pianetta, P, Rao, William, Rietmeijer, Frans J M, Robert, Francois, Brearley, Adrian, Rost, D, Rotundi, Alessandra, Ryan, Robert, Sandford, Scott A, Schwandt, Craig S, See, Thomas H, Schlutter, Dennis, Sheffield-Parker, J, Simionovici, Alexandre, Simon, Steven B, Brenker, F, Sitnitsky, I, Snead, Christopher J, Gilmour, Jamie, Spencer, Meagan K, Stadermann, Frank J, Steele, Andrew, Stephan, Thomas, Stroud, Rhonda, Susini, Jean, Sutton, Stephen, Suzuki, Y, Brennan, Sean, Taheri, Mitra, Taylor, Susan, Teslich, Nick, Tomeoka, Kazu, Tomioka, Naotaka, Toppani, Alice, Trigo-Rodriquez, Josep M, Trodec, David, Tsuchiyama, Akira, Tuzzolino, Anthony J, Bridges, John C, Tyliszczak, Tolek, Uesugi, K, Velbel, Michael, Vellenga, Joe, Vicenzi, E, Vincze, L, Warren, Jack, Weber, Iris, Weisberg, Mike, Westphal, Andrew J, Browning, Nigel D, Wirick, Sue, Wooden, Diane, Wopenka, Brigitte, Wozniakiewicz, Penelope, Wright, Ian, Yabuta, Hikaru, Yano, Hajime, Young, Edward D, Zare, Richard N, Zega, Thomas, Brucato, John R, Brownlee, Don, Tsou, Peter, Aleon, Jerome, Alexander, Conel M O'D, Araki, Tohrú, Bajt, Sasa, Baratta, Gisuseppe A, Bastien, Ron, Bland, Phil, Bleuet, Pierre, Ziegler, Karen, Zimmerman, Laurent, Zinner, Ernst, Zolensky, Michael, Bullock, E, Burchell, Mark J, Busemann, Henner, Butterworth, Anna, Chaussidon, Marc, Cheuvront, Allan, Lyon, Ian, Chi, Miaofang, Cintala, Mark J, Clark, B. C., Clemett, Simon J, Cody, George, Colangeli, Luigi, Cooper, George, Cordier, Patrick, Daghlian, C, Dai, Zurong, MacPherson, Glen, D'Hendecourt, Louis, Djouadi, Zahia, Dominguez, Gerardo, Duxbury, Tom, Dworking, Jason P, Ebel, Denton S, Economou, Thanasis E, Fakra, Sirine, Fairey, Sam A J, Fallon, Stewart, Marcus, Matthew A, Ferrini, Gianluca, Ferroir, T, Fleckenstein , Holger, Floss, Christine, Flynn, George, Franchi, I., Fries, Marc, Gainsforth, Z, Gallien, J P, Genge, Matt, Marhas, Kukjeet, Gilles, Mary K, Gillet, Phillipe, Glavin, Daniel P, Gounelle, Matthieu, Grady, Monica M, Graham, Giles A, Grant, P.G., Green, Simon F, Grossemy, Faustine, Grossman, L, Marty, Bernard, Grossman, Jeffrey N, Guan, Yunbin, Hagiya, Kenji, Harvey, Ralph, Heck, Philipp, Herzog, Gregory F, Hoppe, Peter, Horz, Friedrich, Huth, Joachim, Hutcheon, Ian D, Matrajt, Graciela, Ignatyev, Konstantin, Ishii, Hope, Ito, Motoo, Jacob, Damien, Jacobsen, Chris, Jacobsen, Stein, Jones, Steven B, Joswiak, David, Jurewicz, Amy, Kearsley, Anton T, McKeegan, Kevin D, Keller, Lindsay P, Khodja, H, Kilcoyne, A.L. David, Kissel, Jochen, Krot, Alexander, Langenhorst, F, Lanzirotti, A, Le, Loan, Leshin, Laurie A, Leitner, J, Meibom, Anders, Lemelle, Laurence, Leroux, Hughues, Liu, Ming-chang, Luening, K, Mennella, Vito, Messenger, Keiko, Borg, Janet, Messenger, Scott, Mikouchi, Takashi, Mostefaoui, Smail, Nakamura, Tomoki, Nakano, T, Newville, Matthew, Nittler, Larry R, Ohnishi, Ichiro, Ohsumi, Kazumasa, Okudaira, Kyoko, Bradley, John P, Papanastassiou, Dimitri, Palma, Russ, Palumbo, Maria, Pepin, Robert, Perkins, David, Perronnet, Murielle, Pianetta, P, Rao, William, Rietmeijer, Frans J M, Robert, Francois, Brearley, Adrian, Rost, D, Rotundi, Alessandra, Ryan, Robert, Sandford, Scott A, Schwandt, Craig S, See, Thomas H, Schlutter, Dennis, Sheffield-Parker, J, Simionovici, Alexandre, Simon, Steven B, Brenker, F, Sitnitsky, I, Snead, Christopher J, Gilmour, Jamie, Spencer, Meagan K, Stadermann, Frank J, Steele, Andrew, Stephan, Thomas, Stroud, Rhonda, Susini, Jean, Sutton, Stephen, Suzuki, Y, Brennan, Sean, Taheri, Mitra, Taylor, Susan, Teslich, Nick, Tomeoka, Kazu, Tomioka, Naotaka, Toppani, Alice, Trigo-Rodriquez, Josep M, Trodec, David, Tsuchiyama, Akira, Tuzzolino, Anthony J, Bridges, John C, Tyliszczak, Tolek, Uesugi, K, Velbel, Michael, Vellenga, Joe, Vicenzi, E, Vincze, L, Warren, Jack, Weber, Iris, Weisberg, Mike, Westphal, Andrew J, Browning, Nigel D, Wirick, Sue, Wooden, Diane, Wopenka, Brigitte, Wozniakiewicz, Penelope, Wright, Ian, Yabuta, Hikaru, Yano, Hajime, Young, Edward D, Zare, Richard N, Zega, Thomas, and Brucato, John R

Abstract

The Stardust spacecraft collected thousands of particles from comet 81P/Wild 2 and returned them to Earth for laboratory study. The preliminary examination of these samples shows that the nonvolatile portion of the comet is an unequilibrated assortment of materials that have both presolar and solar system origin. The comet contains an abundance of silicate grains that are much larger than predictions of interstellar grain models, and many of these are high-temperature minerals that appear to have formed in the inner regions of the solar nebula. Their presence in a comet proves that the formation of the solar system included mixing on the grandest scales.

Published
2006

2. Pinpointing the source of a lunar meteorite: implications for the evolution of the moon

Author

Gnos, E, Hofmann, B, al Kathiri, A, Lorenzetti, S, Eugster, O, Whitehouse, M, Villa, I, Jull, A, Eikenberg, J, Spettel, B, Krähenbühl, U, Franchi, I, Greenwood, R, Gnos E, Hofmann, BA, Whitehouse, MJ, Jull, AJT, Franchi, IA, Greenwood, RC, VILLA, IGOR MARIA, Gnos, E, Hofmann, B, al Kathiri, A, Lorenzetti, S, Eugster, O, Whitehouse, M, Villa, I, Jull, A, Eikenberg, J, Spettel, B, Krähenbühl, U, Franchi, I, Greenwood, R, Gnos E, Hofmann, BA, Whitehouse, MJ, Jull, AJT, Franchi, IA, Greenwood, RC, and VILLA, IGOR MARIA

Abstract

The lunar meteorite Sayh at Uhaymir 169 consists of an impact melt breccia extremely enriched with potassium, rare earth elements, and phosphorus [thorium, 32.7 parts per million (ppm); uranium, 8.6 ppm; potassium oxide, 0.54 weight percent], and adherent regolith. The isotope systematics of the meteorite record four lunar impact events at 3909 ± 13 million years ago (Ma), ∼2800 Ma, ∼200 Ma, and <0.34 Ma, and collision with Earth sometime after 9.7 ± 1.3 thousand years ago. With these data, we can link the impact-melt breccia to Imbrium and pinpoint the source region of the meteorite to the Lalande impact crater.

Published
2004

3. Oxygen Isotope Variation in Stony-Iron Meteorites.

Author

Greenwood, R. C., Franchi, I. A., Jambon, A., Barrat, J. A., and Burbine, T. H.

Subjects
*METEORS, *METEORITES, *ASTEROIDS, *VESTA (Asteroid), *ISOTOPES, *SOLAR system, *ASTRONOMY, *PHYSICAL sciences, *SPACE sciences
Abstract

Asteroidal material, delivered to Earth as meteorites, preserves a record of the earliest stages of planetary formation. High-precision oxygen isotope analyses for the two major groups of stony-iron meteorites (main-group pallasites and mesosiderites) demonstrate that each group is from a distinct asteroidal source. Mesosiderites are isotopically identical to the howardite-eucrite-diogenite clan and, like them, are probably derived from the asteroid 4 Vesta. Main-group pallasites represent intermixed core-mantle material from a single disrupted asteroid and have no known equivalents among the basaltic meteorites. The stony-iron meteorites demonstrate that intense asteroidal deformation accompanied planetary accretion in the early Solar System. [ABSTRACT FROM AUTHOR]

Published
2006
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4. Tissint Martian Meteorite: A Fresh Look at the Interior, Surface, and Atmosphere of Mars.

Author

Aoudjehane, H. Chennaoui, Avice, G., Barrat, J.-A., Boudouma, O., Chen, G., Duke, M. J. M., Franchi, I. A., Gattacceca, J., Grady, M. M., Greenwood, R. C., Herd, C. D. K., Hewins, R., Jambon, A., Marty, B., Rochette, P., Smith, C. L., Sautter, V., Verchovsky, A., Weber, P., and Zanda, B.

Subjects
*MARTIAN meteorites, *OLIVINE, *BASALT, *WEATHERING, *AGE of meteorites, *COSMIC rays, *ASTROMINERALOGY, *ANALYTICAL geochemistry, *MARTIAN atmosphere, *MARTIAN surface, *INTERNAL structure of Mars, *MARS (Planet)
Abstract

The article looks at an investigation of the planet Mars through the mineralogical, petrological, and geochemical analysis of the martian meteorite Tissint, which was discovered in Morocco in July 2011. Analysis of the meteorite revealed it to be a depleted picritic shergottite comprised of olivine-rich martian basaltic rock. Tissint also contained magnesian olivine and glass from the atmosphere of Mars and trace elements, sulfur, and fluorine from the planet surface. Other topics discussed include evidence of martian weathering, cosmic radiation exposure, and estimation of the meteorite's age and ejection from Mars.

Published
2012
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5. The nucleosynthetic fingerprint of the outermost protoplanetary disk and early Solar System dynamics.

Author

van Kooten E, Zhao X, Franchi I, Tung PY, Fairclough S, Walmsley J, Onyett I, Schiller M, and Bizzarro M

Abstract

Knowledge of the nucleosynthetic isotope composition of the outermost protoplanetary disk is critical to understand the formation and early dynamical evolution of the Solar System. We report the discovery of outer disk material preserved in a pristine meteorite based on its chemical composition, organic-rich petrology, and 15 N-rich, deuterium-rich, and 16 O-poor isotope signatures. We infer that this outer disk material originated in the comet-forming region. The nucleosynthetic Fe, Mg, Si, and Cr compositions of this material reveal that, contrary to current belief, the isotope signature of the comet-forming region is ubiquitous among outer Solar System bodies, possibly reflecting an important planetary building block in the outer Solar System. This nucleosynthetic component represents fresh material added to the outer disk by late accretion streamers connected to the ambient molecular cloud. Our results show that most Solar System carbonaceous asteroids accreted material from the comet-forming region, a signature lacking in the terrestrial planet region.

Published
2024
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6. Terrestrial carbon and nitrogen isotopic ratios from cretaceous-tertiary boundary nanodiamonds.

Author

Gilmour I, Russell SS, Arden JW, Lee MR, Franchi IA, and Pillinger CT

Abstract

One hypothesis for the origin of the nanometer-size diamonds found at the Cretaceous-Tertiary (K-T) boundary is that they are relict interstellar diamond grains carried by a postulated asteroid. The (13)C/(12)C and (15)N/(14)N ratios of the diamonds from two sites in North America, however, show that the diamonds are two component mixtures differing in carbon and nitrogen isotopic composition and nitrogen abundance. Samples from a site from Italy show no evidence for either diamond component. All the isotopic signatures obtained from the K-T boundary are material well distinguished from known meteoritic diamonds, particularly the fine-grain interstellar diamonds that are abundant in primitive chondrites. The K-T diamonds were most likely produced during the impact of the asteroid with Earth or in a plasma resulting from the associated fireball.

Published
1992
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