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Reply to the comment by Quartau and Mitchell on “Reconstructing the architectur...
Hildenbrand, Anthony; Marques, Fernando; Costa, A.; Sibrant, A.; Silva, Pedro; Henry, Bernard; Miranda, Jorge Miguel; Madureira, PedroReply to the comment by Quartau and Mitchell on “Reconstructing the architectural evolution of volcanic islands from combined K/Ar, morphologic, tectonic, and magnetic data: The Faial Island example (Azores)”, J. Volcanol. Geotherm. Res. 241–242, 39–48, by Hildenbrand et al. (2012)
Palaeomagnetic study of a subaerial volcanic ridge (S˜ao Jorge Island, Azores) ...
Silva, Pedro; Henry, Bernard; Marques, Fernando; Hildenbrand, Anthony; Madureira, Pedro; Mériaux, Catherine; Kratinová, ZusanaWe present a palaeomagnetic study on 38 lava flows and 20 dykes encompassing the past 1.3 Myr on S. Jorge Island (Azores Archipelago—North Atlantic Ocean). The sections sampled in the southeastern and central/western parts of the island record reversed and normal polarities, respectively. They indicate a mean palaeomagnetic pole (81.3◦N, 160.7◦E, K = 33 and A95 = 3.4◦) with a latitude shallower than that expect...
Reconstructing the architectural evolution of volcanic islands from combined K/...
Hildenbrand, Anthony; Marques, Fernando; Costa, A.; Sibrant, A.L.R.; Silva, Pedro; Henry, Bernard; Miranda, Jorge; Madureira, PedroThe morpho-structural evolution of oceanic islands results from competition between volcano growth and partial destruction by mass-wasting processes. We present here a multi-disciplinary study of the successive stages of development of Faial (Azores) during the last 1 Myr. Using high-resolution digital elevation model (DEM), and new K/Ar, tectonic, and magnetic data, we reconstruct the rapidly evolving topograp...
Reconstructing the architectural evolution of volcanic islands from combined K/...
Hildenbrand, Anthony; Marques, Fernando; Costa, A.C.G.; Sibrant, A.L.R.; SIlva, Pedro; Henry, Bernard; Miranda, Miguel; Madureira, PedroThe morpho-structural evolution of oceanic islands results from competition between volcano growth and partial destruction by mass-wasting processes. We present here a multi-disciplinary study of the successive stages of development of Faial (Azores) during the last 1 Myr. Using high-resolution digital elevation model (DEM), and new K/Ar, tectonic, and magnetic data, we reconstruct the rapidly evolving topograp...
Multi-stage evolution of a sub-aerial volcanic ridge over the last 1.3 Myr: S. ...
Hildenbrand, Anthony; Madureira, Pedro; Marques, Fernando; Cruz, Inês; Henry, Bernard; Silva, PedroNew K/Ar dating and geochemical analyses have been carried out on the WNW-ESE elongated oceanic island of S. Jorge (central Azores) to reconstruct the volcanic evolution of a linear ridge developed close to the triple junction between the American, the Eurasian and the Nubian lithospheric plates. We show that S. Jorge sub-aerial edification encompasses the last 1.3 Myr, a time interval far much longer than prev...
Multi-stage evolution of a sub-aerial volcanic ridge over the last 1.3 Myr: S. ...
Hildenbrand, Anthony; Madureira, Pedro; Marques, Fernando; Cruz, Inês; Henry, Bernard; Silva, PedroNew K/Ar dating and geochemical analyses have been carried out on the WNW–ESE elongated oceanic island of S. Jorge to reconstruct the volcanic evolution of a linear ridge developed close to the Azores triple junction. We show that S. Jorge sub-aerial construction encompasses the last 1.3 Myr, a time interval far much longer than previously reported. The early development of the ridge involved a sub-aerial build...
Resultados preliminares de um estudo paleomagnético da ilha do Faial (Arquipéla...
Silva, Pedro; Henry, Bernard; Hildenbrand, Anthony; Marques, Fernando; Madureira, PedroWe 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...
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