| Texto completo | |
| Autor(es): |
Di Chiara, Anita
[1, 2, 3]
;
Speranza, Fabio
[1]
;
Porreca, Massimiliano
[1, 4]
;
Pimentel, Adriano
[4, 5]
;
Caracciolo, Francesca D'Ajello
[1]
;
Pacheco, Jose
[4]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Ist Nazl Geofis & Vulcanol Roma, I-00143 Rome - Italy
[2] Univ Bologna, Dipartimento Fis & Astron, I-40127 Bologna - Italy
[3] Geofis & Ciencias Atmosfer Univ Sao Paulo, Inst Astron, Dept Geofis, BR-05508090 Sao Paulo - Brazil
[4] Univ Acores, Ctr Vulcanol & Avaliacao Riscos Geol, P-9501801 Azores - Portugal
[5] Ctr Informacao & Vigilancia Sismovulcan Acores, P-9501801 Azores - Portugal
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | GEOLOGICAL SOCIETY OF AMERICA BULLETIN; v. 126, n. 9-10, p. 1164-1180, SEP-OCT 2014. |
| Citações Web of Science: | 16 |
| Resumo | |
Faial is one of the most volcanically active islands of the Azores Archipelago. Historical eruptions occurred on the Capelo Peninsula (westernmost sector of the island) during A. D. 1672-1673 and more recently in A. D. 1957-1958. The other exposed volcanic products of the peninsula are so far loosely dated within the Holocene. Here, we present a successful attempt to correlate scoria cones and lava flows yielded by the same eruption on the Capelo Peninsula using paleomagnetic data from 31 sites (10 basaltic scoriae, 21 basaltic lava flows). In the investigated products, we recognize at least six prehistoric clusters of volcanic activity, whereas 11 lava sites are correlated with four scoria cones. Dating was conducted by comparing our paleomagnetic directions with relocated Holocene reference curves of the paleosecular variation of the geomagnetic field from France and the UK. We find that the studied volcanic rocks exposed on the Capelo Peninsula are younger than previously believed, being entirely formed in the last 8 k.y., and that the activity intensified over the last 3 k.y. Our study confirms that paleomagnetism is a powerful tool for unraveling the chronology and characteristics of Holocene activity at volcanoes where geochronological age constraints are still lacking. (AU) | |
| Processo FAPESP: | 13/08938-8 - A intensidade do campo magnético terrestre no Precambriano a partir do estudo de rochas magmáticas da América do Sul |
| Beneficiário: | Anita Di Chiara |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |