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

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 sho...

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Bibliographic Details
Main Authors: Silva, Pedro, Henry, Bernard, Hildenbrand, Anthony, Marques, Fernando, Madureira, Pedro
Format: Book Part
Language:English
Published: Sersilito; Edição a cargo de C. Sousa Oliveira; Aníbal Costa; João C. Nunes 2008
Subjects:
Paeomagnetismo
Ilha do Faial
North Atlantic
Online Access:http://hdl.handle.net/10174/2592
Description
Summary: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.

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