HR: 11:20h
AN: GP22A-05 INVITED     [Abstracts]
TI: A new three-axis vibrating sample magnetometer for continuous high-temperature magnetization measurements: Applications to paleo- and archeointensity determinations
AU: * GALLET, Y
EM: gallet@ipgp.jussieu.fr
AF: IPG Paris, 4 Place Jussieu, Paris, 75005 France
AU: Le Goff, M
EM: legoff@ipgp.jussieu.fr
AF: IPG Paris, 4 Place Jussieu, Paris, 75005 France
AB: We have developed a new three-axis vibrating sample magnetometer (Triaxe) which allows continuous high-temperature magnetization measurements of individual cylindrical 0.75 cm3 samples up to 650øC, and the acquisition of thermoremanent magnetization (TRM) in any direction with a field of up to 200 microT. This equipment offers many possibilities for investigating rock magnetic properties at high temperature. As a first application, we propose a fast (2 hours) automated experimental procedure based on a modified version of the Thellier and Thellier (1959) method revised by Coe (1967) which provides continuous intensity determinations over a large (typically 300øC) temperature interval for each sample. This procedure takes into account both the cooling rate dependence of the TRM acquisition and the anisotropy of TRM. Analyses of numerous pottery and baked brick fragments from Mesopotamia demonstrate the quality and the reliability of the data, and illustrate the potential of this new instrument for paleo- and archeomagnetism.
DE: 1512 Environmental magnetism
DE: 1519 Magnetic mineralogy and petrology
DE: 1521 Paleointensity
DE: 1540 Rock and mineral magnetism
DE: 1594 Instruments and techniques
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2004 AGU Fall Meeting