
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.
geomagnetism, Atmospheric Science, Paleomagnetism, Paleomagnetic Data, Geochronology, geochronology, Argentina, ROCK-MAGNETISM, Early Cretaceous, Magnetosome Formation in Prokaryotes, EARLY CRETACEOUS, Quantum mechanics, Cretaceous, rock-magnetism, https://purl.org/becyt/ford/1.5, Volcanic rock, Biochemistry, Genetics and Molecular Biology, volcanic rock, SOUTH AMERICA, rock property, PALEOINTENSITY, https://purl.org/becyt/ford/1, Geophysical Exploration and Monitoring Techniques, Molecular Biology, Volcano, Earth's magnetic field, Physics, Cordoba [Argentina], Magnetostratigraphy, paleomagnetism, Life Sciences, Paleontology, Geology, FOS: Earth and related environmental sciences, South America, magnetic intensity, Structural basin, Earth and Planetary Sciences, Geomagnetic reversal, Climate Change and Paleoclimatology, Geophysics, Magnetic field, Physical Sciences, Paleointensity, Mesozoic
geomagnetism, Atmospheric Science, Paleomagnetism, Paleomagnetic Data, Geochronology, geochronology, Argentina, ROCK-MAGNETISM, Early Cretaceous, Magnetosome Formation in Prokaryotes, EARLY CRETACEOUS, Quantum mechanics, Cretaceous, rock-magnetism, https://purl.org/becyt/ford/1.5, Volcanic rock, Biochemistry, Genetics and Molecular Biology, volcanic rock, SOUTH AMERICA, rock property, PALEOINTENSITY, https://purl.org/becyt/ford/1, Geophysical Exploration and Monitoring Techniques, Molecular Biology, Volcano, Earth's magnetic field, Physics, Cordoba [Argentina], Magnetostratigraphy, paleomagnetism, Life Sciences, Paleontology, Geology, FOS: Earth and related environmental sciences, South America, magnetic intensity, Structural basin, Earth and Planetary Sciences, Geomagnetic reversal, Climate Change and Paleoclimatology, Geophysics, Magnetic field, Physical Sciences, Paleointensity, Mesozoic
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