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Abstract:

The Early Cretaceous may be considered a key period for understanding the evolution of the Earth's magnetic field. Some still unsolved problems are related to the mode of paleosecular variation (PSV) of the Earth's magnetic field before and during the Cretaceous Normal Superchron. We report here a detailed rock-magnetic, paleomagnetic and paleointensity investigation from 28 lava flows (331 standard paleomagnetic cores) collected in the Argentinean part of the Parana Flood Basalts (Formation Posadas) in order to contribute to the study of PSV during the early Cretaceous and to obtain precise Cretaceous paleomagnetic pole positions for stable South America. The average paleofield direction is precisely determined from 26 sites, which show small within-site dispersion and high directional stability. Five sites show evidences for the self-reversal of thermoremanent magnetization. 23 sites yielded normal polarity magnetization and only 3 are reversely magnetized. Moving windows averages were used to analyze the sequential variation of virtual geomagnetic pole's (VGP) axial positions. Interestingly, the axial average VGP path traces an almost complete cycle around the geographical pole and passes near the location of all previously published Paraná Magmatic Province poles. Both paleomagnetic poles and average VGP paths are significantly different from the pole position suggested by fixed hotspot reconstructions, which may be due to true polar wander or the hotspot motion itself. Only 15 samples from 5 individual basaltic lava flows, yielded acceptable paleointensity estimates. The site mean paleointensities range from 25.2 ± 2.2 to 44.0 ± 2.2 μT. The virtual dipole moments (VDMs) range from 4.8 to 9.9 × 1022 Am2. This correspond to a mean value of 7.7 ± 2.1 × 1022 Am2 which is 96% of the present day geomagnetic field strength. These intensities agree with the relatively high values already reported for Early Cretaceous, which are consistent with some inferences from computer simulations previously published. © 2011 Institute of Geophysics of the ASCR, v.v.i.

Registro:

Documento: Artículo
Título:Paleosecular variation and absolute geomagnetic paleointensity records retrieved from the Early Cretaceous Posadas Formation (Misiones, Argentina)
Autor:Mena, M.; Goguitchaichvili, A.; Solano, M.C.; Vilas, J.F.
Filiación:Instituto de Geofísica Daniel Valencio, Dpto. Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica - Sede Michoacán, Universidad Nacional Autónoma de México, Campus Morelia, 58089 Morelia, Mexico
Palabras clave:Argentina; Early Cretaceous; paleomagnetic poles; paleosecular variation; Paraná Magmatic Province; Posadas Formation; Cretaceous; geomagnetic field; magnetic intensity; magnetic reversal; paleolatitude; paleomagnetism; secular variation; thermoremanent magnetization; virtual geomagnetic pole; Argentina; Misiones [Argentina]
Año:2011
Volumen:55
Número:2
Página de inicio:279
Página de fin:309
DOI: http://dx.doi.org/10.1007/s11200-011-0016-3
Título revista:Studia Geophysica et Geodaetica
Título revista abreviado:Stud. Geophys. Geod.
ISSN:00393169
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v55_n2_p279_Mena

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Citas:

---------- APA ----------
Mena, M., Goguitchaichvili, A., Solano, M.C. & Vilas, J.F. (2011) . Paleosecular variation and absolute geomagnetic paleointensity records retrieved from the Early Cretaceous Posadas Formation (Misiones, Argentina). Studia Geophysica et Geodaetica, 55(2), 279-309.
http://dx.doi.org/10.1007/s11200-011-0016-3
---------- CHICAGO ----------
Mena, M., Goguitchaichvili, A., Solano, M.C., Vilas, J.F. "Paleosecular variation and absolute geomagnetic paleointensity records retrieved from the Early Cretaceous Posadas Formation (Misiones, Argentina)" . Studia Geophysica et Geodaetica 55, no. 2 (2011) : 279-309.
http://dx.doi.org/10.1007/s11200-011-0016-3
---------- MLA ----------
Mena, M., Goguitchaichvili, A., Solano, M.C., Vilas, J.F. "Paleosecular variation and absolute geomagnetic paleointensity records retrieved from the Early Cretaceous Posadas Formation (Misiones, Argentina)" . Studia Geophysica et Geodaetica, vol. 55, no. 2, 2011, pp. 279-309.
http://dx.doi.org/10.1007/s11200-011-0016-3
---------- VANCOUVER ----------
Mena, M., Goguitchaichvili, A., Solano, M.C., Vilas, J.F. Paleosecular variation and absolute geomagnetic paleointensity records retrieved from the Early Cretaceous Posadas Formation (Misiones, Argentina). Stud. Geophys. Geod. 2011;55(2):279-309.
http://dx.doi.org/10.1007/s11200-011-0016-3