HR: 1400h
AN: V43A-03    [Abstracts]
TI: Aeromagnetic Anomalies and Structure of the Colima Volcanic Complex, Western Mexico.
AU: * Lopez-Loera, H
EM: hlopezl@ipicyt.edu.mx
AF: UMG, Camino a la Presa de San Jose 2045, Lomas 4a Sección, San Luis Potosi, SLP 78216, Mexico
AU: Urrutia-Fucugauchi, J
EM: juf@geofisica.unam.mx
AF: AGU, Instituto de Geofísica, Ciudad Universitaria, UNAM, Mexico, DF 04510, Mexico
AU: Alva-Valdivia, L M
EM: lalva@tonatiuh.igofcu.unam.mx
AF: SEG, Instituto de Geofísica, Ciudad Universitaria, UNAM, Mexico, DF 04510, Mexico
AU: Ramos-Leal, J A
EM: jalfredo@ipicyt.edu.mx
AF: UMG, Camino a la Presa de San Jose 2045, Lomas 4a Sección, San Luis Potosi, SLP 78216, Mexico
AU: Alvarez, R
EM: ralva@prodigy.com.mx
AF: SEG, Instituto de Geofísica, Ciudad Universitaria, UNAM, Mexico, DF 04510, Mexico
AB: Results of an aeromagnetic study of the region of the Colima Volcanic Complex (CVC) are presented. CVC is constituted by a N-S range with Cántaro, Nevado and Colima volcanoes, which developed by southward migration of activity inside the Colima rift and related to plate subduction along the Middle America trench. Cantaro volcano does not show isolated defined anomalies associated with the summit; Nevado de Colima volcano presents magnetic anomalies of monopolar characteristics and Colima shows a high-amplitude dipolar anomaly normally polarized and centered on the summit cone. The aeromagnetometric survey over the adjacent regions shows the occurrence of monopolar anomalies associated with intrusive bodies to the NW of the CVC. The survey also reflects the shallow surface and deep geological features with high-amplitude, high-frecuency anomalies over the volcanic units and low-amplitude, long-wavelength anomalies over the volcano-sedimentary deposits. Our study distinguished aeromagnetic trends that have been interpreted associated to faults and/or lithological contacts of regional characteristics that had not been reported previously. We estimate that the magmatic chamber of the active Colima volcano is about two kilometers. Results illustrate the potential of aeromagnetic surveys to investigate active volcanic structures with abrupt topography and difficult access.
UR: http:www.ipicyt.edu.mx
DE: 0370 Volcanic effects (8409)
DE: 8409 Atmospheric effects (0370)
SC: Volcanology, Geochemistry, and Petrology [V]
MN: 2007 Joint Assembly