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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±1.7x1022 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 Cordoba lavas agree remarkably well with those obtained from the Parana Magmatic Province (133-132 Ma). This reinforces the hypothesis about the unreliability of ‘Mesozoic Dipole Low'. © 2006, The Seismological Society of Japan, Society of Geomagnetism and Earth, Planetary and Space Sciences, The Volcanological Society of Japan, The Geodetic Society of Japan, The Japanese Society for Planetary Sciences. All rights reserved.

Registro:

Documento: Artículo
Título:Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)
Autor:Ruiz, R.C.; Goguitchaichvili, A.; Geuna, S.E.; Alva-Valdivia, L.M.; Solé, J.; Morales, J.
Filiación:Laboratorio de Paleomagnetismo, Instituto de Geofiiica, UNAM, Ciudad Universitaria s/n, 04510 Mexico D.F., Mexico
Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofisica, UNAM, Coeneo, Michoacan, Mexico
Laboratorio 'Daniel Valencio', Departamento de Ciencias Geologicas, Facultad de Cs. Exactas y Naturales, Pab. 2(1428), Buenos Aires, Argentina
Instituto de Geologia, UNAM, Ciudad Universitaria s/n, 04510 Mexico, D.F., Mexico
Palabras clave:Early Cretaceous; Paleointensity; rock-magnetism; South America; Cretaceous; geochronology; geomagnetism; magnetic intensity; paleomagnetism; rock property; volcanic rock; Argentina; Cordoba [Argentina]; South America
Año:2006
Volumen:58
Número:10
Página de inicio:1333
Página de fin:1339
DOI: http://dx.doi.org/10.1186/BF03352629
Título revista:Earth, Planets and Space
Título revista abreviado:Earth Planets Space
ISSN:13438832
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_13438832_v58_n10_p1333_Ruiz.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13438832_v58_n10_p1333_Ruiz

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Citas:

---------- APA ----------
Ruiz, R.C., Goguitchaichvili, A., Geuna, S.E., Alva-Valdivia, L.M., Solé, J. & Morales, J. (2006) . Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina). Earth, Planets and Space, 58(10), 1333-1339.
http://dx.doi.org/10.1186/BF03352629
---------- CHICAGO ----------
Ruiz, R.C., Goguitchaichvili, A., Geuna, S.E., Alva-Valdivia, L.M., Solé, J., Morales, J. "Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)" . Earth, Planets and Space 58, no. 10 (2006) : 1333-1339.
http://dx.doi.org/10.1186/BF03352629
---------- MLA ----------
Ruiz, R.C., Goguitchaichvili, A., Geuna, S.E., Alva-Valdivia, L.M., Solé, J., Morales, J. "Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)" . Earth, Planets and Space, vol. 58, no. 10, 2006, pp. 1333-1339.
http://dx.doi.org/10.1186/BF03352629
---------- VANCOUVER ----------
Ruiz, R.C., Goguitchaichvili, A., Geuna, S.E., Alva-Valdivia, L.M., Solé, J., Morales, J. Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina). Earth Planets Space. 2006;58(10):1333-1339.
http://dx.doi.org/10.1186/BF03352629