Resultados preliminares de um estudo paleomagnético da ilha do Faial (Arquipélago dos Açores)

Abstract

We present preliminary paleomagnetic results dor Faial Island (central group of Azores Archipelago, North Atlantic Ocean). Our sampling strategy was focused on a collection of samples from lava flows that represent a large temporal window according to previous geochronological data. Main results show that: (i) onshore volcanic activity began during the Matuyama geomagnetic chron; (ii) the southern branch of the Faial graben probably corresponds to an oldest volcano; (iii) paleomagnetic results from the northern branch strongly suggest that all lava sequence from this site was erupted durong Brunhes Geochron; (iv) paleomagnetic results yeld a first paleomagnetic pole for Faial Island defined by φ = 133.8º, λ = 80.2ºN.