Astrogeology Science Center
Publications
Ice and debris in the fretted terrain, Mars
Viking moderate- and high-resolution images along the northern highland margin were studied monoscopically and stereoscopically to contribute to an understanding of the development of fretted terrain. Results support the hypothesis that the fretting process involved flow facilitated by interstitial ice. The process apparently continued for a long...
Lucchitta, Baerbel K. The Galilean satellite geological mapping program
The Galilean Satellite Geological Mapping Program was established to illuminate detailed geologic relations on the four large satellites of Jupiter. The program involves about 40 investigators from various universities, reseach institutes, and government offices in the United Sttes, England, Germany, and Italy. A total of 24 researchers have been...
Lucchitta, Baerbel K. Channels and valleys on Mars
The discovery of channels, valleys, and related features of aqueous origin on Mars is of profound importance in comparative planetology. Models of the evolution of planetary surfaces and atmospheres must be reconciled with the diversity, abundance, and origins of channels and valleys on Mars. The term “channel” is properly restricted to those...
Geology, past and future: Planetary geology
No abstract available.
Lucchitta, Baerbel K. Chryse Basin channels: low-gradients and ponded flows.
Gradients on the floors of the Martian outflow channels that are derived from radar-elevation profiles across Lunae Planum and Chryse Basin have much lower values than those obtained from the U.S. Geological Survey's topographic map. Whereas the gradients of Maja and Ares Valles are similar to those of the catastrophic flood channels in the...
Lucchitta, Baerbel K.; Ferguson, H.M. Ice sculpture in the Martian outflow channels
Many landforms in Martian outflow channels have characteristics that suggest sculpture by glaciers, ice streams, or ice sheets. Viking Orbiter and terrestrial satellite images were examined at similar resolution to compare features of the Martian outflow channels to features produced by the movement of ice on earth. Many resemblances were found....
Lucchitta, Baerbel K. Implementation of digital subtraction angiography with a synchrotron x-ray beam
The intense synchrotron radiation produced by wiggler magnets at electron storage rings provides a new source of x-rays highly suited to iodine K-edge digital subtraction angiography. The monochromaticity and tunability provide maximum sensitivity to intraarterial iodine and virtually eliminate contrast due to soft tissue and bone. Visualization...
Zeman, H.D.; Hughes, E.B.; Campbell, L.E.; Hofstadter, R.; Kirk, Randolph L.; Krolicki, T.J.; Rolfe, J.; Stone, J.P.; Wilson, S.; Rubenstein, E.; Thompson, A.C.; Walton, J.T. The geology of Europa
The map units and lineations of Europa are detailed, and the geologic processes, and history, and thick and thin ice models of the satellite are discussed. It is concluded that Europa lacks evidence of a horizontally stratified crust; the geology appears characterized by disruption of the crust and intrusions into an icy shell. The surface...
Lucchitta, Baerbel K.; Soderblom, Laurence A.
The geologic investigation of the Taurus-Littrow Valley; Apollo 17 landing site, with a section on Apollo 17 lunar surface photography
No abstract available.
Wolfe, Edward W.; Bailey, N.G.; Lucchitta, Baerbel K.; Muehlberger, W.R.; Scott, D.H.; Sutton, R.L.; Wilshire, H.G.; Batson, R.M.; Larson, K.B.; Tyner, R.L. Synchrotron radiation and its application to digital subtraction angiography
The intense synchrotron radiation produced at electron storage rings provides a new source of X-rays highly suited to iodine K-edge digital subtraction angiography. The high intensity and small angular divergence permit the radiation to be monochromatized by Bragg diffraction and made available in beams of small vertical size, of arbitrary...
Rubenstein, E.; Hughes, E.B.; Campbell, L.E.; Hofstadter, R.; Kirk, Randolph L.; Krolicki, T.J.; Stone, J.P.; Wilson, S.; Zeman, H.D.; Brody, W.R. Did ice streams carve martian outflow channels?
Outflow channels on Mars1 are long sinuous linear depressions that occur mostly in the equatorial area (±30° lat.). They differ from small valley networks2 by being larger and arising full born from chaotic terrains. Outflow channels resemble terrestrial stream beds, and their origin has generally been attributed to water3–5 in...
Lucchitta, Baerbel K.; Anderson, D.M.; Shoji, H. Mars and Earth: Comparison of cold-climate features
On Earth, glacial and periglacial features are common in areas of cold climate. On Mars, the temperature of the present-day surface is appropriate for permafrost, and the presence of water is suspected from data relating to the outgassing of the planet, from remote-sensing measurements over the polar caps and elsewhere on the Martian surface, and...
Lucchitta, Baerbel K.