Variação dos parâmetros paleomagnéticos em perfis dos Tufos de Condeixa (Baixo Mondego, Portugal)

Abstract

Key words: Tufos de Condeixa; paleomagnetism; Brunhes Chron; lonian; magnetic properties; paleoclimatic changes; Lower Mondego; Portugal. Paleomagnetic parameters measured in 4 outcrops of the Tufos de Condeixa are presented. The directional signatures allow the admission of the Reversed Polarity Criptchron C1n-1 in the Condeixa-a-Velha outcrop. II was possible to discuss the magnetic properties, origin of the magnetic grains and paleoclimatic variation relationships. The downward of the initial magnetization and magnetic susceptibility values in the Condeixa-a-Velha outcrop coincide wilh the C1n- 1 (504-493 Ka) occurrence and may represent a paleoclimatic variation. The Tufos de Condeixa were formed during lhe lonian-Tarentian(?).