Sobre la confiabilidad de algunos registros paleomagnéticos transicionales en la Faja Volcánica Transmexicana
On the reliability of some transitional paleomagnetic records along the Transmexican Volcanic Belt
Miguel Cervantes-Solano1,*, Ulises Díaz-Ortega2, Rafael García-Ruiz3, Avto Goguitchaichvili3, Héctor López-Loera4, José Rosas-Elguera5, Jaime Urrutia-Fucugauchi6, Rafael Maciel-Peña7, Juan Morales3
1 Escuela Nacional de Estudios Superiores Unidad Morelia, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro No. 8701 Col. Ex Hacienda de San José de la Huerta C.P. 58190 Morelia, Michoacán, México.
2 Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Unidad de Posgrado, Ciudad Universitaria C.P. 04510, México.
3 Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica Unidad Michoacán, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro No. 8701 Col. Ex Hacienda de San José de la Huerta C.P. 58190 Morelia, Michoacán, México.
4 División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica A.C., Cam. a la Presa de San José 2055, Lomas 4ta Secc, 78216 San Luis Potosí, México.
5 Centro Universitario de los Valles, Universidad de Guadalajara, Carr. a Guadalajara Supermanzana El Km. 45.5, 46708 Caimanero, Jalisco, México.
6 Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la investigación Científica s/n, Ciudad Universitaria, Delegación Coyoacán, C.P. 04150, México.
7 Instituto Tecnológico Superior de Tacámbaro, Av. Tecnológico No. 201, Zona El Gigante, 61650 Tacámbaro, Michoacán, México.
Autor para correspondencia: (M. Cervantes-Solano) This email address is being protected from spambots. You need JavaScript enabled to view it.
How to cite this article:
Cervantes-Solano,M., Díaz-Ortega, U., García-Ruiz, R., Goguitchaichvili, A., López-Loera, H. Rosas-Elguera, J.Urrutia-Fucugauchi, J., MacielPeña, J.M., 2024, Sobre la confiabilidad de algunos registros paleomagnéticos transicionales en la Faja Volcánica Transmexicana: Boletín de la Sociedad Geológica Mexicana, 76 (3), A140224. http://dx.doi.org/10.18268/BSGM2024v76n3a140224
Manuscript received: October 23, 2024; corrected manuscript received: February 5, 2024; manuscript accepted: February 13, 2024.
ABSTRACT
The Earth’s magnetic field experiences variations in both its essentially dipolar configuration and absolute intensity. Paleomagnetic records have shown that these variations can be so extreme that the field has reversed its polarity on multiple occasions in the geological past. Moreover, the geomagnetic field occasionally moves away from its most stable dipole position for relatively short periods, heading in the opposite direction without reaching total geomagnetic reversal. In this context, paleomagnetic studies carried out recently in the Trans Mexican Volcanic Belt have provided some new evidence about several potential geomagnetic excursions that occurred during the last million years. However, some of these results are controversial since sites with the same associated age yielded contradictory paleomagnetic directions. These differences have been attributed both to the precision in age determination and to methodological aspects during sampling, which makes their interpretation difficult from a geomagnetic point of view. Here we report, a detailed rock-magnetic, aeromagnetic and paleomagnetic study on nine independent cooling units belonging to the Michoacan Guanajuato Volcanic Field (Trans-Mexican Volcanic Belt) where these lava units have provided some contradictory results reported in previous studies.
Keywords: paleomagnetism, geomagnetic excursion, Michoacán-Guanajuato volcanic field.
