HR: 0800h
AN: GP11B-0834 INVITED     [Abstracts]
TI: Microwave Palaeointensity Study of Jorullo Volcano (Central Mexico)
AU: * Gratton, M N
EM: gratton@liv.ac.uk
AF: Geomagnetism Laboratory, Univ. of Liverpool, Liverpool, L69 7ZE United Kingdom
AU: Goguitchaichvili, A
EM: avto@tonatiuh.igeofcu.unam.mx
AF: Instituto de Geofisica, UNAM, Ciudad Universitaria, Mexico City, 04510 Mexico
AU: Conte, G
EM: avto@tonatiuh.igeofcu.unam.mx
AF: Instituto de Geofisica, UNAM, Ciudad Universitaria, Mexico City, 04510 Mexico
AU: Shaw, J
EM: shaw@liv.ac.uk
AF: Geomagnetism Laboratory, Univ. of Liverpool, Liverpool, L69 7ZE United Kingdom
AU: Urrutia-Fucugauchi, J
EM: juf@tonatiuh.igeofcu.unam.mx
AF: Instituto de Geofisica, UNAM, Ciudad Universitaria, Mexico City, 04510 Mexico
AB: A single lava flow from the earliest eruption period (ca.1759-1774) of Jorullo Volcano, Michoac n-Guanajuato volcanic field, Mexico has been sampled to determine the palaeointensity of the magnetic field at the time of extrusion. Both conventional Thellier-Thellier experiments and two variants of the microwave palaeointensity technique (Coe variant of the Thellier-Thellier method (Coe, 1967) and the perpendicular applied field method (Kono & Ueno, 1977)) have been carried out. High quality palaeointensity results have been obtained, with both methods mostly in good agreement. This study presents further evidence of the equivalence of both microwave and thermal methods and adds to the database of palaeomagnetic data from the monogenetic volcanoes of Central America.
DE: 1521 Paleointensity
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2004 AGU Fall Meeting