Benvenuti nell'Anagrafe della Ricerca d'Ateneo
La valutazione delle attività di ricerca che si svolgono nelle università ha assunto un'importanza rilevante sia per l'intero sistema universitario sia all'interno di ogni singolo ateneo. Roma Tre si è quindi dotata di idonei strumenti informativi in grado di supportare al meglio le azioni di monitoraggio e di valutazione delle attività di ricerca svolte nei propri dipartimentied ha realizzato una Anagrafe della Ricerca di Ateneo.
EnglishThe Shallow Radar (SHARAD) on the Mars Reconnaissance Orbiter has imaged the internal stratigraphy of the north polar layered deposits of Mars. Radar reflections within the deposits reveal a laterally continuous deposition of layers, which typically consist of four packets of finely spaced reflectors separated by homogeneous interpacket regions of nearly pure ice. The packet/interpacket structure can be explained by approximately million-year periodicities in Mars’ obliquity or orbital eccentricity. The observed ~100-meter maximum deflection of the underlying substrate in response to the ice load implies that the present-day thickness of an equilibrium elastic lithosphere is greater than 300 kilometers. Alternatively, the response to the load may be in a transient state controlled by mantle viscosity. Both scenarios probably require that Mars has a subchondritic abundance of heat-producing elements.
PHILLIPS R. J, ZUBER M. T, SMREKAR S. E, MELLON M. T, HEAD J. W, TANAKA K. L, et al. (2008). Mars North Polar Deposits: Stratigraphy, Age, and Geodynamical Response. SCIENCE, 320, 1182-1185 [10.1126/science.1157546].
| Titolo: | Mars North Polar Deposits: Stratigraphy, Age, and Geodynamical Response | |
| Autori: | ||
| Data di pubblicazione: | 2008 | |
| Rivista: | ||
| Citazione: | PHILLIPS R. J, ZUBER M. T, SMREKAR S. E, MELLON M. T, HEAD J. W, TANAKA K. L, et al. (2008). Mars North Polar Deposits: Stratigraphy, Age, and Geodynamical Response. SCIENCE, 320, 1182-1185 [10.1126/science.1157546]. | |
| Abstract: | The Shallow Radar (SHARAD) on the Mars Reconnaissance Orbiter has imaged the internal stratigraphy of the north polar layered deposits of Mars. Radar reflections within the deposits reveal a laterally continuous deposition of layers, which typically consist of four packets of finely spaced reflectors separated by homogeneous interpacket regions of nearly pure ice. The packet/interpacket structure can be explained by approximately million-year periodicities in Mars’ obliquity or orbital eccentricity. The observed ~100-meter maximum deflection of the underlying substrate in response to the ice load implies that the present-day thickness of an equilibrium elastic lithosphere is greater than 300 kilometers. Alternatively, the response to the load may be in a transient state controlled by mantle viscosity. Both scenarios probably require that Mars has a subchondritic abundance of heat-producing elements. | |
| Handle: | http://hdl.handle.net/11590/139842 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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