Estudio paleomagnético de variación secular sobre flujos de lava fechados por Ar-Ar del área de Tacámbaro (Michoacán, México): Primera evidencia volcánica de la excursión geomagnética Intra-Jaramilo

  1. Rafael Maciel Peña 1
  2. Avto Goguitchaichvili 24
  3. Marie-Noëlle Guilbaud 2
  4. Vicente Carlos Ruíz Martínez 3
  5. Manuel Calvo Rather 4
  6. Sánchez Leda 5
  7. Claus Siebe 2
  8. Bertha Aguilar Reyes 2
  9. Juan Morales 2
  1. 1 Laboratorio Interinstitucional de Magnetismo Natural, Sede Tacámbaro,Instituto Tecnológico Superior de Tacámbaro
  2. 2 Universidad Nacional Autónoma de México
    info

    Universidad Nacional Autónoma de México

    Ciudad de México, México

    ROR https://ror.org/01tmp8f25

  3. 3 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  4. 4 Universidad de Burgos
    info

    Universidad de Burgos

    Burgos, España

    ROR https://ror.org/049da5t36

  5. 5 Universidad La República
    info

    Universidad La República

    Santiago de Chile, Chile

    ROR https://ror.org/05xs36f43

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Journal:
Latinmag Letters

ISSN: 2007-9656

Year of publication: 2013

Volume: 3

Issue: OD05

Pages: 1-6

Type: Article

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More publications in: Latinmag Letters

Abstract

This study presents new paleomagnetic results from 37 independent cooling units in Michoacán-GuanajuatoVolcanic Field (MGVF) in western México). The available ages range from 32 Ma to < 5000 yrs BC(Guilbaud et al. 2012). The characteristic paleodirections are successfully isolated for 34 lava flows. Themean paleodirection obtained in this study is I = 33°, D = 353°, k = 57, a95 = 3.4°, N = 34. These directions arepractically undistinguishable from the expected Plio-Quaternary paleodirections. The paleosecular variation isestimated through the study of the scatter of virtual geomagnetic poles giving SF = 13.7 with SU = 16.5 andSL = 11.82 (upper and lower limits respectively) which reasonably agree with the model G of McFadden etal. (1988, 1991) fit to the Johnson et al. (2008) databases for the last 5 Ma.