Possible Holocene excursion of the Earth's magnetic field in southern South America: New records from archaeological sites in Argentina

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  • Nami Hugo G.
    Laboratorio de Paleomagnetismo“Daniel A. Valencio”, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas, Físicas y Naturales, Ciudad Universitaria Programa de Estudios Prehistóricos (CONICET)

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Description

Palaeomagnetic studies were carried out in several archaeological and palaeontological sites across Argentina and Chile. Remanence directions far removed from the present magnetic field, probably corresponding to a field excursion were recorded in several stratigraphic sections spaning -11 to 2 ky bp. Detailed palaeomagnetic data from 235 cores obtained in six sections from archaeological sites in Argentina are reported. Stability of the NRM was analyzed by progressive thermal and alternating field demagnetization and ChRM directions determined in most cases. Computed VGPs from those directions tend to be concentrated over North America, Europe, Eastern Asia and Africa. Using 275 VGPs a palaeomagnetic pole that is -20°apart from the Earth's rotation's axis was obtained.

Journal

  • Earth, Planets and Space

    Earth, Planets and Space 51 (3), 175-191, 1999

    Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences

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