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HR: 1340h
AN: GP23A-0167
TI: Magnetic Mineralogy in Oxidized Lava Flows
AU: * Kontny, A
EM: agnes.kontny@urz.uni-heidelberg.de
AF: Ruprecht-Karls University, Geological-Paleontological Institute, Heidelberg, D-69120 Germany
AU: Kletetschka, G
EM: gkletets@pop600.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code691, Greenbelt, 20771 United States
AU: Kletetschka, G
EM: gkletets@pop600.gsfc.nasa.gov
AF: Department of Physics, Catholic University of America, Department of Physics, Washington DC, 20064 United States
AU: Kletetschka, G
EM: gkletets@pop600.gsfc.nasa.gov
AF: Institute of Geology, Academy of Sciences, Institute of Geology, Prague, 16000 Czech Republic
AU: Wasilewski, P J
EM: u1pjw@lepvax.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code691, Greenbelt, 20771 United States
AB: Oxidized basaltic lava flows are common in terrestrial environment and magnetic mineralogy ranges from rhombohedral to spinel phases contributing to a complex overall magnetic behavior. Similar rock types are responsable for very intense magnetic anomalies on Earth and may be an equivalent to those on Mars. Therefore this research may identify the magnetic techniques that should be employed as part of instrumentation on board of remote control rover on surface of Mars. We obtained a large number of magnetic and mineralogic tests on a basaltic profile across a tree mold from Kilauea volcano, Hawaii, where the oxygen fugacity was presumably modified by the presence of combustible organic material within the lava flow. The lava flow cools down rapidly as it approaches much cooler organic material. This process results in contrasting contents of titanium in magnetic phases and different Fe-Ti oxide textures, which is important for the overall rock magnetic properties. We attempted to identify the contribution of all the magnetic phases within these rocks using different remanence and susceptibility measurement at very low-, low- and high-temperature as well as optical and electron microscope investigations. The phases within these rocks are titanohematite (self reversing composition), ferrian ilmenite and titanomagnetite, which contribute to the induced as well as to the remanent component of the magnetization.
DE: 1500 GEOMAGNETISM AND PALEOMAGNETISM
DE: 1519 Magnetic mineralogy and petrology
DE: 1540 Rock and mineral magnetism
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2004 AGU Fall Meeting