NEW DETAILED HOLOCENE PALEOMAGNETIC RECORDS WITH ANOMALOUS GEOMAGNETIC FIELD BEHAVIOR IN ARGENTINA

Hugo Gabriel Nami

Resumen


Detailed palaeomagnetic studies were performed in several archaeological and geological sections dated with diverse relative and absolute methods. Data from 360 cores obtained in eight sites across eastern Argentina are reported. Characteristic remanence magnetization directions was determined by progressive alternating field demagnetization. Remanence directions showed anomalous geomagnetic field behavior far removed from the present magnetic field showing oblique normal, oblique reverse and reverse polarities during the latest Pleistocene and Holocene with evidence of a possible field excursions were recorded in several stratigraphic sections spanning ~11-0.5 kya. Computed virtual geomagnetic poles from those directions tend to be concentrated over North America, Europe, Eastern Asia, Africa and Australia. The hypothesis of the anomalous geomagnetic field directions is probably related with 14C fluctuations and solar activity is discussed.

 


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Los trabajos publicados en esta revista están bajo la licencia Creative Commons Atribución-NoComercial 2.5 Argentina.

Geoacta Publicación de la Asociación Argentina de Geofísicos y Geodestas. ISSN 1852-7744 (en linea) ISSN 0326-7237 (impreso).

ASOCIACIÓN ARGENTINA DE GEOFISICOS Y GEODESTAS
Instituto Geográfico Nacional
Departamento de Relaciones Institucionales
Avenida Cabildo 381 (CP 1426)
Ciudad Autónoma de Buenos Aires
Argentina

http://www.aagg.org.ar