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10 results on '"Leshin, Laurie"'

6. Comet 81p/Wild 2 under a Microscope

Author

Brownlee, Don, Tsou, Peter, Aléon, Jérôme, 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, Hörz, 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, Leuning, 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, Takeshi, 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, François, 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-Rodríguez, 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

Published
2006
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7. Isotopic Compositions of Cometary Matter Returned by Stardust

Author

McKeegan, Kevin D., Aléon, 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, François, Schlutter, Dennis, Snead, Christopher J., Stadermann, Frank J., Stroud, Rhonda, Tsou, Peter, Westphal, Andrew, Young, Edward D., Ziegler, Karen, Zimmermann, Laurent, and Zinner, Ernst

Published
2006
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9. Insights into the formation of Fe- and Mg-rich aqueous solutions on early Mars provided by the ALH 84001 carbonates

Author

Niles, Paul B., Zolotov, Mikhail Yu., and Leshin, Laurie A.

Subjects
*GEOLOGICAL formations, *SOLUTION (Chemistry), *IRON, *MAGNESIUM, *CARBONATES, *METEORITES, *WATER-rock interaction, *CHEMICAL equilibrium, *MARTIAN geology, *MARS (Planet)
Abstract

Abstract: The chemical and isotopic pattern of the zoned carbonate globules in the ALH 84001 meteorite reveals a unique aqueous environment on early Mars. If the evolution of the fluid composition was dictated primarily by carbonate precipitation, the zoning pattern of the carbonates can constrain the fluid to have had an Mg/Ca mole ratio>~5.3 and a Fe/Ca mole ratio>~1 prior to the formation of the carbonates. Chemical equilibrium modeling of water–rock interactions indicates that low temperatures and low pH favor the formation of an aqueous solution with elevated Mg and Fe concentrations. The modeling shows that a sufficiently Fe- and Mg-rich fluid could have formed through low-temperature (<100 °C) subsurface aqueous alteration of an ALH 84001-type rock at pH 5–7. This range of pH corresponds to an elevated CO2 fugacity (~0.1–1 bar). Formation of ALH 84001 carbonates could have been driven by degassing of CO2 and corresponding pH increase in near-surface environments during an upwelling of subsurface CO2-rich solutions. This scenario is consistent with the unaltered nature of the ALH 84001 rock and with chemical and isotopic composition of its carbonates. [Copyright &y& Elsevier]

Published
2009
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10. The origin of water on Mars

Author

Lunine, Jonathan I., Chambers, John, Morbidelli, Alessandro, and Leshin, Laurie A.

Subjects
*WATER, *MARS (Planet), *ASTEROIDS, *METEORITES
Abstract

This paper considers the origin of water on Mars, in the context of a dynamical model that accounts for most of the Earth''s water as a product of collisions between the growing Earth and planet-sized “embryos” from the asteroid belt. Mars'' history is found to be different; to explain the present mass of Mars requires that it suffer essentially no giant collisions and the bulk of its growth is through addition of smaller bodies. Asteroids and comets from beyond 2.5 AU provide the source of Mars'' water, which totals 6–27% of the Earth''s present ocean (1 Earth ocean≡1.5×1021 kg), equivalent to 600–2700-m depth on the martian surface. The D/H ratio of this material is 1.2–1.6 times Standard Mean Ocean Water, the smaller value obtaining for the larger amount of water accreted. The upper half of the range of total water accreted, while many times less than that acquired by the Earth, is consistent with geological data on Mars, and the D/H value is that derived for martian magmatic water from SNC meteorites. Both together are consistent with published interpretations of the high D/H in present-day martian atmospheric water in terms of water loss through atmospheric escape. [Copyright &y& Elsevier]

Published
2003
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