Title: New
perspectives on ancient Mars
Author(s): Solomon
SC, Aharonson O, Aurnou JM, Banerdt WB, Carr MH, Dombard AJ, Frey HV,
Golombek MP, Hauck SA, Head JW, Jakosky BM, Johnson CL, McGovern PJ,
Neumann GA, Phillips RJ, Smith DE, Zuber MT
Source: SCIENCE
307 (5713): 1214-1220 FEB 25 2005
Document Type: Review
Language: English
Abstract: Mars
was most active during its first billion years. The core, mantle, and
crust formed within similar to50 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.
KeyWords Plus: MARTIAN
HYDROTHERMAL SYSTEMS; HF-W CHRONOMETRY; THERMAL EVOLUTION;
MAGNETIC-FIELD; TERRESTRIAL PLANETS; GLOBAL DISTRIBUTION; NORTHERN
PLAINS; CRUSTAL MAGNETIZATION; EARLY DIFFERENTIATION; MANTLE CONVECTION
Addresses: Solomon
SC (reprint author), Carnegie Inst Washington, Dept Terr Magnetism,
5241 Broad Branch Rd NW, Washington, DC 20015 USA
Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA
CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA
90095 USA
CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
US Geol Survey, Menlo Pk, CA 94025 USA
Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA
NASA, Terr Phys Lab, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Case Western Reserve Univ, Dept Geol Sci, Cleveland, OH 44106 USA
Brown Univ, Dept Geol Sci, Providence, RI 02912 USA
Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80309 USA
Univ Colorado, Dept Geol Sci, Boulder, CO 80309 USA
Univ Calif San Diego, Scripps Inst Oceanog, Inst Geophys &
Planetary Phys, La Jolla, CA 92093 USA
Lunar & Planetary Inst, Houston, TX 77058 USA
MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
Publisher: AMER
ASSOC ADVANCEMENT SCIENCE, 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005
USA
Subject Category: MULTIDISCIPLINARY
SCIENCES
IDS Number: 901WP
ISSN: 0036-8075
