Computer Science – Sound
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6702s&link_type=abstract
American Astronomical Society, DPS meeting #38, #67.02; Bulletin of the American Astronomical Society, Vol. 38, p.618
Computer Science
Sound
Scientific paper
Mars was at its most active during the Noachian (prior to 3.7 Ga), and interior and surface processes were strongly interlinked. On the basis of short- and long-lived radionuclides in the source regions of the Martian meteorites, global differentiation of core, mantle, and crust on Mars occurred within a few tens of millions of years of solar system formation. Impact structures buried beneath the northern plains of Mars and discernible from radar sounding and topography support the view that the northern hemisphere crust, and by implication the crustal thickness dichotomy, are as ancient as the crust in the southern hemisphere, although the late heavy bombardment complicates the assignment of crater retention ages in the Noachian. The large areas of coherently magnetized Noachian crust imply the presence of a magnetic dynamo, presumably generated in an actively convecting fluid core. By Late Noachian the Tharsis province had become a major focus for volcanism, deformation, and outgassing of water and carbon dioxide, possibly in quantities sufficient to induce episodes of global climate warming. A substantial early water budget contributed to widespread erosion, sediment transport, and chemical alteration of crustal material. A more massive early atmosphere was shielded against solar wind stripping by the planetary magnetic field. Deep hydrothermal circulation of water in the Martian crust likely accelerated crustal cooling and the preservation of variations in crustal thickness. Such circulation could have chemically altered the carriers of earliest crustal magnetization, rendering any residual crustal magnetization beneath the northern plains and the lowest areas of other major drainage basins undetectable from orbit, an inference that permits a Martian dynamo to have persisted to the end of the Noachian. Cessation of the dynamo, widespread reduction in the crustal field, and waning of interior outgassing allowed the early atmosphere to dissipate and the planet's surface to cool.
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