Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)

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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 mea...

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Autores principales: Ruiz, R.C., Goguitchaichvili, A., Geuna, S.E., Alva-Valdivia, L.M., Solé, J., Morales, J.
Formato: JOUR
Materias:
Early Cretaceous
Paleointensity
rock-magnetism
South America
Cretaceous
geochronology
geomagnetism
magnetic intensity
paleomagnetism
rock property
volcanic rock
Argentina
Cordoba [Argentina]
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1333_Ruiz
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_13438832_v58_n10_p1333_Ruiz
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spelling todo:paper_13438832_v58_n10_p1333_Ruiz2023-10-03T16:09:49Z Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina) Ruiz, R.C. Goguitchaichvili, A. Geuna, S.E. Alva-Valdivia, L.M. Solé, J. Morales, J. Early Cretaceous Paleointensity rock-magnetism South America Cretaceous geochronology geomagnetism magnetic intensity paleomagnetism rock property volcanic rock Argentina Cordoba [Argentina] South America 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. Fil:Geuna, S.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1333_Ruiz
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Early Cretaceous
Paleointensity
rock-magnetism
South America
Cretaceous
geochronology
geomagnetism
magnetic intensity
paleomagnetism
rock property
volcanic rock
Argentina
Cordoba [Argentina]
South America
spellingShingle Early Cretaceous
Paleointensity
rock-magnetism
South America
Cretaceous
geochronology
geomagnetism
magnetic intensity
paleomagnetism
rock property
volcanic rock
Argentina
Cordoba [Argentina]
South America
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)
topic_facet Early Cretaceous
Paleointensity
rock-magnetism
South America
Cretaceous
geochronology
geomagnetism
magnetic intensity
paleomagnetism
rock property
volcanic rock
Argentina
Cordoba [Argentina]
South America
description 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.
format JOUR
author Ruiz, R.C.
Goguitchaichvili, A.
Geuna, S.E.
Alva-Valdivia, L.M.
Solé, J.
Morales, J.
author_facet Ruiz, R.C.
Goguitchaichvili, A.
Geuna, S.E.
Alva-Valdivia, L.M.
Solé, J.
Morales, J.
author_sort Ruiz, R.C.
title Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)
title_short Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)
title_full Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)
title_fullStr Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)
title_full_unstemmed Early cretaceous absolute geomagnetic paleointensities from Cordoba Province (Argentina)
title_sort early cretaceous absolute geomagnetic paleointensities from cordoba province (argentina)
url http://hdl.handle.net/20.500.12110/paper_13438832_v58_n10_p1333_Ruiz
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AT geunase earlycretaceousabsolutegeomagneticpaleointensitiesfromcordobaprovinceargentina
AT alvavaldivialm earlycretaceousabsolutegeomagneticpaleointensitiesfromcordobaprovinceargentina
AT solej earlycretaceousabsolutegeomagneticpaleointensitiesfromcordobaprovinceargentina
AT moralesj earlycretaceousabsolutegeomagneticpaleointensitiesfromcordobaprovinceargentina
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