On the reliability of some transitional paleomagnetic records along the Transmexican Volcanic Belt;
Por:
Cervantes-Solano M., Díaz-Ortega U., García-Ruiz R., Goguitchaichvili A., López-Loera H., Rosas-Elguera J., Urrutia-Fucugauchi J., Maciel-Peña R., Morales J.
Publicada:
1 ene 2024
Resumen:
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. © (2024), (Instituto de Geology Universidad Nacional Autonoma de Mexico). All Rights Reserved.
Filiaciones:
Cervantes-Solano M.:
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, Michoacán, Morelia, C.P. 58190, Mexico
Díaz-Ortega U.:
Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Unidad de Posgrado, Ciudad Universitaria, C.P. 04510, Mexico
García-Ruiz R.:
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, Michoacán, Morelia, C.P. 58190, Mexico
Goguitchaichvili A.:
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, Michoacán, Morelia, C.P. 58190, Mexico
López-Loera H.:
División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica A.C., Cam. a la Presa de San José 2055, Lomas 4ta Secc, San Luis Potosí, 78216, Mexico
Rosas-Elguera J.:
Centro Universitario de los Valles, Universidad de Guadalajara, Carr. a Guadalajara Supermanzana El Km. 45.5, Jalisco, Caimanero, 46708, Mexico
Urrutia-Fucugauchi J.:
Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito de la investigación Científica s/n, Delegación Coyoacán, C.P. 04150, Mexico
Maciel-Peña R.:
Instituto Tecnológico Superior de Tacámbaro, Av. Tecnológico No. 201, Zona El Gigante, Michoacán, Tacambaro, 61650, Mexico
Morales J.:
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, Michoacán, Morelia, C.P. 58190, Mexico
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