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Chapter 11 The older volcanic complexes of São Miguel, Azores: Nordeste and Povoação

A. M. Duncan, J. E. Guest, N. Wallenstein and D. K. Chester
Geological Society, London, Memoirs, 44, 147-153, 16 September 2015, https://doi.org/10.1144/M44.11
A. M. Duncan
1Institute of Biological, Environmental Science and Technology, University of Bedfordshire, Park Square, Luton LU1 3JU, UK
2Department of Geography and Planning, University of Liverpool, Liverpool L69 3BX, UK
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  • For correspondence: A.M.Duncan@liverpool.ac.uk
J. E. Guest
3Department of Earth Sciences, University College London, London WC1E 6BT, UK
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N. Wallenstein
4Centro de Vulcanologia e Avaliação de Riscos Geológicos, Universidade dos Açores, Rua Mãe de Deus, 9501-801, Ponta Delgada, Portugal
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D. K. Chester
2Department of Geography and Planning, University of Liverpool, Liverpool L69 3BX, UK
5Department of Geography and Environmental Science, Liverpool Hope University, L16 9JD, UK
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Abstract

The oldest part of São Miguel is to the east of Furnas. Previous research argued that these volcanics belong to a construct called the Nordeste Volcano, a heavily eroded shield which not only extends to the east coast of the island but also underlies Furnas Volcano in the west. On the basis of geomorphological mapping, we argue that Nordeste comprises two volcanic systems: an older Nordeste construct (the Nordeste Volcanic System) and the younger Povoação Volcano that straddles the Nordeste shield on its western margin. The Nordeste Volcanic System consists of the Lower Basalts which constitute the overwhelming majority of its subaerial products that are exposed in coastal cliff sections. Above the Lower Basalts is a surficial drape of ankaramites and the Upper Basalts. There is no evidence of large explosive trachytic eruptions from Nordeste Volcanic System. Povoação Volcano comprises an early shield construct, after which the volcano experienced caldera collapse. Post-caldera deposits are poorly exposed, but include basaltic, mugearitic and trachytic lavas intercalated by cut-and-fill sequences. Radiometric dating has yet to resolve fully the absolute ages of the Nordeste and Povoação volcanic systems, but morphology indicates that the former is much older than the latter.

  • © 2015 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Memoirs: 44 (1)
Geological Society, London, Memoirs
Volume 44
2015
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Chapter 11 The older volcanic complexes of São Miguel, Azores: Nordeste and Povoação

A. M. Duncan, J. E. Guest, N. Wallenstein and D. K. Chester
Geological Society, London, Memoirs, 44, 147-153, 16 September 2015, https://doi.org/10.1144/M44.11
A. M. Duncan
1Institute of Biological, Environmental Science and Technology, University of Bedfordshire, Park Square, Luton LU1 3JU, UK
2Department of Geography and Planning, University of Liverpool, Liverpool L69 3BX, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: A.M.Duncan@liverpool.ac.uk
J. E. Guest
3Department of Earth Sciences, University College London, London WC1E 6BT, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
N. Wallenstein
4Centro de Vulcanologia e Avaliação de Riscos Geológicos, Universidade dos Açores, Rua Mãe de Deus, 9501-801, Ponta Delgada, Portugal
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
D. K. Chester
2Department of Geography and Planning, University of Liverpool, Liverpool L69 3BX, UK
5Department of Geography and Environmental Science, Liverpool Hope University, L16 9JD, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Chapter 11 The older volcanic complexes of São Miguel, Azores: Nordeste and Povoação

A. M. Duncan, J. E. Guest, N. Wallenstein and D. K. Chester
Geological Society, London, Memoirs, 44, 147-153, 16 September 2015, https://doi.org/10.1144/M44.11
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