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HR: 1340h
AN: GP43A-0884
TI: Magnetic coercivity and intensity
of Mars crust: Dichotomy formation via unicellular convection mechanism
AU: * Kletetschka, G
EM: gunther.kletetschka@gsfc.nasa.gov
AF: Catholic University of America,
Cardinal Station, Washington, DC 20064 United States
AU: * Kletetschka, G
EM: gunther.kletetschka@gsfc.nasa.gov
AF: Institute of Geology, Rozvojova 36,
Prague, 11150 Czech Republic
AU: * Kletetschka, G
EM: gunther.kletetschka@gsfc.nasa.gov
AF: NASA, Code 691, Greenbelt, MD 20771
United States
AU: Acuna, M H
EM: mario.acuna@nasa.gov
AF: NASA, Code 691, Greenbelt, MD 20771
United States
AU: Connerney, J E
EM: Jack.Connerney@nasa.gov
AF: NASA, Code 691, Greenbelt, MD 20771
United States
AU: Wasilewski, P J
EM: u1pjw@lepvax.gsfc.nasa.gov
AF: NASA, Code 691, Greenbelt, MD 20771
United States
AU: Ness, N F
EM: nfnudel@yahoo.com
AF: Bartol Research Institute,
University of Delaware, Newark, DE 19713 United States
AB:
Intense magnetic anomalies over the Mars surface indicate that during
the early history of Mars large portions of Mars crust
formed in the presence of global magnetic field. Distribution of the
magnetic anomalies can be divided into three zones. Zone 1 is where the
magnetic signature is negligible or of low intensity. Zone 2 is the
region of intermediate crustal anomalies
and Zone 3 is where there are magnetic anomalies of extreme magnetic
intensity. Crater demagnetization behavior suggests that at least part
of the Zone 3 located near the South Pole is generated by rocks with
large magnetic coercivity. TRM analyses
with terrestrial rocks suggest that compositional banding significantly
enhances the TRM intensity. Both magnetic coercivity
and intensity values near the South pole suggest presence of a
deformation and compositional zoning of the rock in the Mars
crust. This can be most simply explained by contractional deformation
due to density contrasts above the down welling zone at the South Pole
and formation of new crust above the upwelling zone at the North pole.
DE: 1517 Magnetic anomalies: modeling
and interpretation
DE: 1518 Magnetic fabrics and anisotropy
DE: 1519 Magnetic mineralogy and
petrology
DE: 5440 Magnetic fields and magnetism
DE: 5499 General or miscellaneous
SC: Geomagnetism and Paleomagnetism [GP]
MN: Fall Meeting 2005
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