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21 results on '"Wyatt, Michael B."'

1. Morphology and Composition of the Surface of Mars: Mars Odyssey THEMIS Results

Author

Christensen, Philip R., Bandfield, Joshua L., Bell, James F., Gorelick, Noel, Hamilton, Victoria E., Ivanov, Anton, Jakosky, Bruce M., Kieffer, Hugh H., Lane, Melissa D., Malin, Michael C., McConnochie, Timothy, McEwen, Alfred S., McSween, Harry Y., Mehall, Greg L., Moersch, Jeffery E., Nealson, Kenneth H., Rice, James W., Richardson, Mark I., Ruff, Steven W., Smith, Michael D., Titus, Timothy N., and Wyatt, Michael B.

Published
2003

2. Diviner Lunar Radiometer Observations of Cold Traps in the Moon's South Polar Region

Author

Paige, David A., Siegler, Matthew A., Zhang, Jo Ann, Hayne, Paul O., Foote, Emily J., Bennett, Kristen A., Vasavada, Ashwin R., Greenhagen, Benjamin T., Schofield, John T., McCleese, Daniel J., Foote, Marc C., DeJong, Eric, Bills, Bruce G., Hartford, Wayne, Murray, Bruce C., Allen, Carlton C., Snook, Kelly, Soderblom, Laurence A., Calcutt, Simon, Taylor, Fredric W., Bowles, Neil E., Bandfield, Joshua L., Elphic, Richard, Ghent, Rebecca, Glotch, Timothy D., Wyatt, Michael B., and Lucey, Paul G.

Published
2010

3. Highly Silicic Compositions on the Moon

Author

Glotch, Timothy D., Lucey, Paul G., Bandfield, Joshua L., Greenhagen, Benjamin T., Thomas, Ian R., Elphic, Richard, Bowles, Neil, Wyatt, Michael B., Allen, Carlton C., Hanna, Kerri Donaldson, and Paige, David A.

Published
2010

6. Global geologic context for rock types and surface alteration on Mars

Author

Wyatt, Michael B., McSween, Harry Y., Jr., Tanaka, Kenneth L., and Head, James W., III

Subjects
Mars (Planet) -- Discovery and exploration, Geology -- Research, Andesite, Earth sciences
Abstract

Petrologic interpretations of thermal emission spectra from Mars orbiting spacecraft indicate the widespread occurrence of surfaces having basaltic and either andesitic or partly altered basalt compositions. Global concentration of ice-rich mantle deposits and near-surface ice at middle to high latitudes and their spatial correlation with andesitic or partly altered basalt materials favor the alteration hypothesis. We propose the formation of these units through limited chemical weathering from basalt interactions with icy mantles deposited during periods of high obliquity. Alteration of sediments in the northern lowlands depocenter may have been enhanced by temporary standing bodies of water and ice. Keywords: Mars, crust, basalt, andesite, alteration, thermal emission spectroscopy.

Published
2004

7. Spectral evidence for weathered basalt as an alternative to andesite in the northern lowlands of Mars

Author

Wyatt, Michael B. and McSween, Jr, Harry Y.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Michael B. Wyatt (corresponding author); Harry Y. McSween, Jr Mineral abundances derived from the analysis of remotely sensed thermal emission data from Mars have been interpreted to indicate that [...]

Published
2002
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9. Constraints on the Composition and Petrogenesis of the Martian Crust

Author

McSween, Harry Y., Jr, Grove, Timothy L, and Wyatt, Michael B

Subjects
Lunar And Planetary Science And Exploration
Abstract

Spectral interpretation that silicic rocks are widespread on Mars implies that Earth's differentiated crust is not unique. Evaluation of observations bearing on the composition of the Martian crust (Martian meteorite petrology and a possible crustal assimilant, analysis of Mars Pathfinder rocks, composition of Martian fines, interpretation of spacecraft thermal emission spectra, and inferred crustal densities) indicates that the crust can be either basalt plus andesite or basalt plus weathering products. New calculated chemical compositions for Thermal Emission Spectrometer (TES) global surface units indicate that surface type 1 has basaltic andesite composition and surface type 2 has the composition of andesite. If these materials represent volcanic rocks, their calc-alkaline compositions on a FeO*/MgO versus silica diagram suggest formation by hydrous melting and fractional crystallization. On Earth, this petrogenesis requires subduction, and it may suggest an early period of plate tectonics on Mars. However, anorogenic production of andesite might have been possible if the primitive Martian mantle was wet. Alternatively, chemical weathering diagrams suggest that surface type 2 materials could have formed by partial weathering of surface type 1 rocks, leading to depletion in soluble cations and mobility of silica. A weathered crust model is consistent with the occurrence of surface type 2 materials as sediments in a depocenter and with the alpha proton X-ray spectrometer (APXS) analysis of excess oxygen suggesting weathering rinds on Pathfinder rocks. If surface type 1 materials are also weathered or mixed with weathered materials, this might eliminate the need for hydrous melting, consistent with a relatively dry Martian mantle without tectonics.

Published
2003
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12. Bounce Rock-A shergottite-like basalt encountered at Meridiani Planum, Mars

Author

ZIPFEL, Jutta, primary, SCHRÖDER, Christian, additional, JOLLIFF, Bradley L., additional, GELLERT, Ralf, additional, HERKENHOFF, Kenneth E., additional, RIEDER, Rudolf, additional, ANDERSON, Robert, additional, BELL III, James F., additional, BRÜCKNER, Johannes, additional, CRISP, Joy A., additional, CHRISTENSEN, Philip R., additional, CLARK, Benton C., additional, De SOUZA Jr., Paulo A., additional, DREIBUS, Gerlind, additional, D’USTON, Claude, additional, ECONOMOU, Thanasis, additional, GOREVAN, Steven P., additional, HAHN, Brian C., additional, KLINGELHÖFER, Göstar, additional, McCOY, Timothy J., additional, McSWEEN Jr., Harry Y., additional, MING, Douglas W., additional, MORRIS, Richard V., additional, RODIONOV, Daniel S., additional, SQUYRES, Steven W., additional, WÄNKE, Heinrich, additional, WRIGHT, Shawn P., additional, WYATT, Michael B., additional, and YEN, Albert S., additional

Published
2011
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15. Surface and subsurface composition of the Life in the Atacama field sites from rover data and orbital image analysis

Author

Piatek, Jennifer L., primary, Hardgrove, Craig, additional, Moersch, Jeffrey E., additional, Drake, Darrell M., additional, Wyatt, Michael B., additional, Rampey, Michael, additional, Carlisle, Orion, additional, Warren-Rhodes, Kim, additional, Dohm, James M., additional, Hock, Andrew N., additional, Cabrol, Nathalie A., additional, Wettergreen, David S., additional, Grin, Edmond A., additional, Diaz, Guillermo Chong, additional, Coppin, Peter, additional, Weinstein, Shmuel, additional, Cockell, Charles S., additional, Marinangeli, Lucia, additional, Ori, Gian Gabriele, additional, Smith, Trey, additional, Jonak, Dominic, additional, Wagner, Michael, additional, Stubbs, Kristen, additional, Thomas, Geb, additional, Pudenz, Erin, additional, and Glasgow, Justin, additional

Published
2007
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