New perspectives on ancient Mars |
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Authors: | Solomon Sean C Aharonson Oded Aurnou Jonathan M Banerdt W Bruce Carr Michael H Dombard Andrew J Frey Herbert V Golombek Matthew P Hauck Steven A Head James W Jakosky Bruce M Johnson Catherine L McGovern Patrick J Neumann Gregory A Phillips Roger J Smith David E Zuber Maria T |
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Institution: | Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA. scs@dtm.ciw.edu |
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Abstract: | Mars was most active during its first billion years. The core, mantle, and crust formed within approximately 50 million years of solar system formation. A magnetic dynamo in a convecting fluid core magnetized the crust, and the global field shielded a more massive early atmosphere against solar wind stripping. The Tharsis province became a focus for volcanism, deformation, and outgassing of water and carbon dioxide in quantities possibly sufficient to induce episodes of climate warming. Surficial and near-surface water contributed to regionally extensive erosion, sediment transport, and chemical alteration. Deep hydrothermal circulation accelerated crustal cooling, preserved variations in crustal thickness, and modified patterns of crustal magnetization. |
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