Southwestward volcanic migration in the western Trans-Mexican Volcanic Belt during the last 2 Ma

Hugo Delgado Granados; Jaime Urrutia-Fucugauchi; Toshiaki Hasenaka; Masao Ban

doi:10.22201/igeof.00167169p.1995.34.3.728

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Published: Jul 1, 1995

DOI: https://doi.org/10.22201/igeof.00167169p.1995.34.3.728

Keywords:

Trans-Mexican Volcanic Belt, Michoacan-Guanajuato Volcanic Field, Chapala Rift, paleomagnetism, K-Ar dates, stratigraphy, magnetostratigraphy, volcanic migration

Hugo Delgado Granados

Universidad Nacional Autónoma de México, Instituto de Geofísica, Ciudad Universitaria, Delegación Coyoacán, 04510, Ciudad de México, Mexico.

Jaime Urrutia-Fucugauchi

Universidad Nacional Autónoma de México, Instituto de Geofísica, Ciudad Universitaria, Delegación Coyoacán, 04510, Ciudad de México, Mexico.

Toshiaki Hasenaka

Institute of Mineralogy, Petrology and Economic Geology, Faculty of Science, Tohoku University, Japan

Masao Ban

Department of Earth Sciences, Yamagata University, Japan.

Abstract

K-Ar dating and paleomagnetic results for the Chapala region provide age estimates for the Tizapan Group (Late Miocene-Early Pliocene), Chapala Group (Late Miocene-Early Pliocene), Travesaño Group (Early Pliocene), Grande Group, Palo Verde Group and Zacoalco Group (Late Pliocene-Early Pleistocene), Santa Cruz Group, and Acatlan Group(Early Pleistocene). For the Michoacan-Guanajuato Volcanic Field (MGVF), magnetostratigraphic studies led to. an improved understanding of time and spatial patterns of volcanis. Trends of volcanism in the MGVF suggest a 90 km trenchward migration of volcanic activity around the Brunhes-Matuyama boundary (0.78 Ma). In the Chapala region a transitional and smaller spatial migration occurred around the Pliocene-Pleistocene boundary. This migration implied a change in magmatic evolution as shown by a decrease in size of volcanic edifices.

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Academic society: Geofísica Internacional
Publisher: Universidad Nacional Autónoma de México. Instituto de Geofísica

How to Cite

Delgado Granados, H., Urrutia-Fucugauchi, J., Hasenaka, T., & Ban, M. (1995). Southwestward volcanic migration in the western Trans-Mexican Volcanic Belt during the last 2 Ma. Geofisica Internacional, 34(3), 341–352. https://doi.org/10.22201/igeof.00167169p.1995.34.3.728