Resultados preliminares de um estudo paleomagnético da ilha do Faial (Arquipéla...

• Author(s): Silva, Pedro ; Henry, Bernard ; Hildenbrand, Anthony ; Marques, Fernando ; Madureira, Pedro
• Date: 2008
• Persistent ID: http://hdl.handle.net/10174/2592
• Origin: Repositório Científico da Universidade de Évora
• Subject(s): Paeomagnetismo; Ilha do Faial
• Document Type: Part of book or chapter of book
• Language: English
• Editor(s): Sersilito; Edição a cargo de C. Sousa Oliveira; Aníbal Costa; João C. Nunes

Description

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.