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6 results on '"Mostefaoui, Smail"'

1. Pristine extraterrestrial material with unprecedented nitrogen isotopic variation

Author

Briani, Giacomo, Gounelle, Matthieu, Marrocchi, Yves, Mostefaoui, Smail, Leroux, Hugues, Quirico, Eric, and Meibom, Anders

Subjects
Isotope separation -- Methods, Isotope separation -- Usage, Mineralogy -- Research, Solar system -- Observations, Science and technology
Abstract

Pristine meteoritic materials carry light element isotopic fractionations that constrain physiochemical conditions during solar system formation. Here we report the discovery of a unique xenolith in the metal-rich chondrite Isheyevo. Its fine-grained, highly pristine mineralogy has similarity with interplanetary dust particles (IDPs), but the volume of the xenolith is more than 30,000 times that of a typical IDP. Furthermore, an extreme continuum of N isotopic variation is present in this xenolith: from very light N isotopic composition [[delta].sup.15][N.sub.AIR] = -310 [+ or -] 20 [per thousand]), similar to that inferred for the solar nebula, to the heaviest ratios measured in any solar system material ([[delta].sup.15][N.sub.AIR] = 4,900 [+ or -] 300 [per thousand]). At the same time, its hydrogen and carbon isotopic compositions exhibit very little variation. This object poses serious challenges for existing models for the origin of light element isotopic anomalies. isotopic fractionation | pristine meteorites | Solar System

Published
2009

2. Mineralogy and petrology of comet 81P/Wild 2 nucleus samples

Author

Zolensky, Michael E., Zega, Thomas J., Yano, Hajime, Wirick, Sue, Westphal, Andrew J., Weisberg, Mike K., Weber, Iris, Warren, Jack L., Velbel, Michael A., Tsuchiyama, Akira, Tsou, Peter, Toppani, Alice, Tomioka, Naotaka, Tomeoka, Kazushige, Teslich, Nick, Taheri, Mitra, Susini, Jean, Stroud, Rhonda, Stephan, Thomas, Stadermann, Frank J., Snead, Christopher J., Simon, Steven B., Simionovici, Alexandre, See, Thomas H., Robert, Francois, Rietmeijer, Frans J.M., Rao, William, Perronnet, Murielle C., Papanastassiou, Dimitri A., Okudaira, Kyoko, Ohsumi, Kazumasa, Ohnishi, Ichiro, Nakamura-Messenger, Keiko, Nakamura, Tomoki, Mostefaoui, Smail, Mikouchi, Takashi, Meibom, Anders, Matrajt, Graciela, Marcus, Matthew A., Leroux, Hugues, Lemelle, Laurence, Le, Loan, Lanzirotti, Antonio, Langenhorst, Falko, Krot, Alexander N., Keller, Lindsay P., Kearsley, Anton T., Joswiak, David, Jacob, Damien, Ishii, Hope, Harvey, Hagiya, Kenji, Grossman, Lawrence, Grossman, Jeffrey N., Graham, Giles A., Gounelle, Matthieu, Gillet, Philippe, Genge, Matthew J., Flynn, George, Ferroir, Tristan, Fallon, Stewart, Ebel, Denton S., Dai, Zu Rong, Cordier, Patrick, Clark, Benton, Chi, Miaofang, Butterworth, Anna L., Brownlee, Donald E., Bridges, John C., Brennan, Sean, Brearley, Adrian, Bradley, John P., Bleuet, Pierre, Bland, Phil A., and Bastien, Ron

Subjects
Mineralogy -- Research, Mineralogy -- Analysis, Petrology -- Analysis, Comets -- Composition, Comets -- Research, Comets -- Analysis
Published
2006

3. Comet 81P/Wild 2 Under a Microscope

Author

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

Subjects
United States. National Aeronautics and Space Administration, Astronomy -- Research, Comets -- Research
Published
2006

4. Organics captured from Comet 81P/Wild 2 by the Stardust Spacecraft

Author

Sandford, Scott A., Aleon, Jerome, Alexander, Conel M. O'D., Araki, Tohru, Bajt, Sasa, Baratta, Giuseppe A., Borg, Janet, Bradley, John P., Brownlee, Donald E., Brucato, John R., Burchell, Mark J., Busemann, Henner, Butterworth, Anna, Clemett, Simon J., Cody, George, Colangeli, Luigi, Cooper, George, D'Hendecourt, Louis, Djouadi, Zahia, Dworkin, Jason P., Ferrini, Gianluca, Fleckenstein, Holger, Flynn, George J., Franchi, Ian A., Fries, Marc, Gilles, Mary K., Glavin, Daniel P., Gounelle, Matthieu, Grossemy, Faustine, Jacobsen, Chris, Keller, Lindsay P., Kilcoyne, A.L. David, Leitner, Jan, Matrajt, Graciela, Meibom, Anders, Mennella, Vito, Mostefaoui, Smail, Nittler, Larry R., Palumbo, Maria E., Papanastassiou, Dimitri A., Robert, Francois, Rotundi, Alessandra, Snead, Christopher J., Spencer, Maegan K., Stadermann, Frank J., Steele, Andrew, Stephan, Thomas, Tsou, Peter, Tyliszczak, Tolek, Westphal, Andrew J., Wirick, Sue, Wopenka, Brigitte, Yabuta, Hikaru, Zare, Richard N., and Zolensky, Michael E.

Subjects
Comets -- Observations, Comets -- Structure, Comets -- Analysis
Published
2006

5. Isotopic compositions of cometary matter returned by Stardust

Author

McKeegan, Kevin D., Aleon, Jerome, Bradley, John, Brownlee, Donald, Busemann, Henner, Butterworth, Anna, Chaussidon, Marc, Fallon, Stewart, Floss, Christine, Gilmour, Jamie, Gounelle, Matthieu, Graham, Giles, Guan, Yunbin, Heck, Philipp R., Hoppe, Peter, Hutcheon, Ian D., Huth, Joachim, Ishii, Hope, Ito, Motoo, Jacobsen, Stein B., Kearsley, Anton, Leshin, Laurie A., Liu, Ming-Chang, Lyon, Ian, Marhas, Kuljeet, Marty, Bernard, Matrajt, Graciela, Meibom, Anders, Messenger, Scott, Mostefaoui, Smail, Mukhopadhyay, Sujoy, Nakamura-Messenger, Keiko, Nittler, Larry, Palma, Russ, Pepin, Robert O., Papanastassiou, Dimitri A., Robert, Francois, Schlutter, Dennis, Snead, Christopher J., Stadermann, Frank J., Stroud, Rhonda, Tsou, Peter, Westphal, Andrew, Young, Edward D., Ziegler, Karen, Zimmermann, Laurent, and Zinner, Ernst

Subjects
Isotopes -- Structure, Isotopes -- Research, Isotopes -- Analysis, Solar system -- Research, Solar system -- Analysis, Comets -- Structure, Comets -- Research, Comets -- Analysis
Published
2006

6. Trace element distribution between orthopyroxene and clinopyroxene in peridotites from the Gakkel Ridge: a SIMS and NanoSIMS study

Author

Hellebrand, Eric, Snow, Jonathan E., Mostefaoui, Smail, and Hoppe, Peter

Subjects
Earth sciences
Abstract

Byline: Eric Hellebrand (1), Jonathan E. Snow (1,2), Smail Mostefaoui (1,3), Peter Hoppe (1) Abstract: Clinopyroxenes (cpx) in abyssal and ophiolitic peridotites are commonly analyzed for lithophile trace element abundances in order to estimate degrees of melting and porosity conditions during melt extraction, assuming that these data reflect near-solidus conditions. During cooling, however, cpxs always exsolve into parallel lamellae of low-Ca enstatite and high-Ca diopside. This may potentially lead to redistribution of the initial trace element budget. Since orthopyroxene (opx) cannot significantly host most incompatible trace elements, exsolution will lead to an enrichment in the cpx lamellae. In order to address a possibly exsolution-controlled partitioning between cpx and opx, we have obtained major and trace element mineral compositions on 14 plagioclase-free ocean floor mantle rocks. They cover the entire abyssal peridotite compositional spectrum from very fertile to highly depleted compositions. The mean volume proportion of opx lamellae in cpx porphyroclasts lies around 15% of the original cpx. For the light to middle rare earth elements, the enrichment in the measured cpx exsolution is exclusively controlled by these phase proportions. Relative to these highly incompatible trace elements, solely Ti and Yb partition significantly into opx. Lamellar interpyroxene partition coefficients, estimated from NanoSIMS analyses, are around three times as high as the ones for near-solidus bulk pyroxene. The equilibration temperatures for the exsolution lamella are slightly higher than 800degC. The bulk cpx can be reconstructed using the lamellar proportions and their relative partitioning. The implication of such a reconstruction is that the cpx rare earth element patterns shift almost in parallel to lower values. These shifts, however, do not affect mantle melting models proposed thus far for mid-ocean ridges. Author Affiliation: (1) Max-Planck-Institut fur Chemie, 55020, Mainz, Germany (2) Department of Geosciences, University of Houston, 312 S&R, Houston, TX, 77204, USA (3) Laboratoire d'Etude de la Matiere Extraterrestre, Museum National d'Histoire Naturelle, Paris, France Article History: Registration Date: 16/09/2005 Received Date: 25/05/2005 Accepted Date: 05/09/2005 Online Date: 12/11/2005 Article note: Editorial Responsibility: J. Hoefs Electronic Supplementary Material Supplementary material is available for this article at http://dx.doi.org/10.1007/10.1007/s00410-005-0036-5 and is accessible for authorized users.

Published
2005

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