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Volume 58 Supplement 10

Special Issue: Paleomagnetism and Tectonics in Latinamerica

Early cretaceous absolute geomagnetic paleointensities from Córdoba Province (Argentina)

Earth, Planets and Space volume 58, pages 1333–1339 (2006)Cite this article

Abstract

We present here new paleointensity and geochronology results from Early Cretaceous volcanic rocks of Sierra Chica de Cordoba (Argentina). The new K-Ar isotopic ages of 5 samples range from 136 to 122 Ma. Twenty five samples from 7 individual flows yielded acceptable paleointensity estimates. The mean paleointensity values per flow are ranging from 53.0 ± 1.9 to 25.4 ± 2.6 μT and the corresponding Virtual Dipole Moments (VDMs) are ranging from 9.3±1.3 to 4.6±0.5 (1022 Am2). This corresponds to the mean value of 7.3±1.7×1022 Am2, which is compatible to the present geomagnetic axial dipole. Currently available selected paleointensity data from 80 to 130 Ma suggest that geomagnetic field strength frequently fluctuated before and during the Cretaceous Normal Superchron while the magnetic polarity maintained stable. The mean paleointensities derived from Córdoba lavas agree remarkably well with those obtained from the Paraná Magmatic Province (133–132 Ma). This reinforces the hypothesis about the unreliability of ‘Mesozoic Dipole Low’. Key words: Paleointensity, rock-magnetism, Early Cretaceous, South America.

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Author notes

  1. Avto Goguitchaichvili

    Present address: sabbatical Departamento de Geologia y Mineralogía, Universidad Michoacana San Nicolas de Hidalgo, Mexico

Authors and Affiliations

  1. Laboratorio de Paleomagnetismo, Instituto de Geofïica, UNAM, Ciudad Universitaria s/n, 04510, Mexico, D.F., Mexico

    Ruben Cejudo Ruiz, Avto Goguitchaichvili, Luis M. Alva-Valdivia & Juan Morales

  2. Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofisica, UNAM, Coeneo, Michoacán, Mexico

    Avto Goguitchaichvili

  3. Laboratorio ‘Daniel Valencio’, Departamento de Ciencias Geologicas, Facultad de Cs. Exactas y Naturales, Pab. 2(1428), Buenos Aires, Argentina

    Silvana E. Geuna

  4. Instituto de Geologia, UNAM, Ciudad Universitaria s/n, 04510, Mexico, D.F., Mexico

    Jesus Solé

Authors
  1. Ruben Cejudo Ruiz
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Correspondence to Avto Goguitchaichvili.

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Ruiz, R.C., Goguitchaichvili, A., Geuna, S.E. et al. Early cretaceous absolute geomagnetic paleointensities from Córdoba Province (Argentina). Earth Planet Sp 58, 1333–1339 (2006). https://doi.org/10.1186/BF03352629

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Key words

  • Paleointensity
  • rock-magnetism
  • Early Cretaceous
  • South America