New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic–phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean)
International audience The Trindade Island is located in the South Atlantic Ocean, 1170 km from the Brazilian coast and represents the eastern end of the submarine E–W Vitória–Trindade Chain. This is interpreted as the Trindade plume track beneath the South American plate during the Cenozoic. Almeid...
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Online Access: | https://hal.science/hal-01527342 https://doi.org/10.1016/j.jvolgeores.2016.09.020 |
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ftunivcotedazur:oai:HAL:hal-01527342v1 2023-12-03T10:30:19+01:00 New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic–phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean) Pires, C. Bongiolo, E.M. Geraldes, C. Renac, C. Santos, A.C. Jourdan, F. Neumann, R. programa de pos-graduacao em geologia insituto de geociencias, universidade federal do rio de janeiro Universidade do Estado do Rio de Janeiro - Faculdade de Geologia Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) Western Australian Argon Isotope Facility (WAAIF) The Institute for Geoscience Research Perth (TIGeR) School of Earth and Planetary Science Perth - Curtin university Curtin University Perth -Curtin University Perth -School of Earth and Planetary Science Perth - Curtin university Curtin University Perth -Curtin University Perth Centre for Mineral Technology (CETEM) Ministère de la Science et Technologie 2016-11-15 https://hal.science/hal-01527342 https://doi.org/10.1016/j.jvolgeores.2016.09.020 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jvolgeores.2016.09.020 hal-01527342 https://hal.science/hal-01527342 doi:10.1016/j.jvolgeores.2016.09.020 ISSN: 0377-0273 Journal of Volcanology and Geothermal Research https://hal.science/hal-01527342 Journal of Volcanology and Geothermal Research, 2016, 327, pp.531 - 538. ⟨10.1016/j.jvolgeores.2016.09.020⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2016 ftunivcotedazur https://doi.org/10.1016/j.jvolgeores.2016.09.020 2023-11-07T23:45:02Z International audience The Trindade Island is located in the South Atlantic Ocean, 1170 km from the Brazilian coast and represents the eastern end of the submarine E–W Vitória–Trindade Chain. This is interpreted as the Trindade plume track beneath the South American plate during the Cenozoic. Almeida (1961) recognized five volcanogenic successions at Trindade in decreasing age: the Trindade Complex (TC) and the Desejado (DF), Morro Vermelho (MV), Valado (VF) and Paredão (PF) formations, composed of nephelinitic to phonolitic effusive-pyroclastic deposits, dykes and necks. Here, we present new 40Ar/39Ar ages and re-evaluation of available 40K/40Ar* data that, coupled with previous petrological information, allowed us to reconstruct the volcanic history of the island (i.e., 3.9–0.25 Ma) distinguishing near synchronous volcanic episodes and solving several stratigraphic uncertainties reported in the literature.The geochronological dataset show that the nephelinitic–phonolitic volcanism at Trindade was discontinuous throught time, being marked by periods of high volcanic activity and periods of quiescence, which suggests variable melt production and eruption rates. The peak of the volcanic activity occurred between 3.9 and 2.5 Ma (i.e., Lower Pliocene to Lower Pleistocene) that is represented by the TC, which correspond to the largest volume of volcanic deposits preserved in the island. The volcanic activity slows down progressively from 2.5 Ma to cease at ca. 1.6 Ma, period that is represented by the DF. This volcanism was followed by a quiescent period that lasted until the ephemeral nephelinitic volcanism of the MV (no age), VA (no age) and PF (ca. 0.25 Ma). Thus, the volcanic activity in Trindade was ceased completely at ca. 0.25 Ma, event registered in the uppermost volcanic deposits of the PF and that represents the last volcanic activity in the Brazilian territory. Article in Journal/Newspaper South Atlantic Ocean HAL Université Côte d'Azur Morro ENVELOPE(-57.500,-57.500,-63.833,-63.833) Journal of Volcanology and Geothermal Research 327 531 538 |
institution |
Open Polar |
collection |
HAL Université Côte d'Azur |
op_collection_id |
ftunivcotedazur |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Pires, C. Bongiolo, E.M. Geraldes, C. Renac, C. Santos, A.C. Jourdan, F. Neumann, R. New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic–phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean) |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Trindade Island is located in the South Atlantic Ocean, 1170 km from the Brazilian coast and represents the eastern end of the submarine E–W Vitória–Trindade Chain. This is interpreted as the Trindade plume track beneath the South American plate during the Cenozoic. Almeida (1961) recognized five volcanogenic successions at Trindade in decreasing age: the Trindade Complex (TC) and the Desejado (DF), Morro Vermelho (MV), Valado (VF) and Paredão (PF) formations, composed of nephelinitic to phonolitic effusive-pyroclastic deposits, dykes and necks. Here, we present new 40Ar/39Ar ages and re-evaluation of available 40K/40Ar* data that, coupled with previous petrological information, allowed us to reconstruct the volcanic history of the island (i.e., 3.9–0.25 Ma) distinguishing near synchronous volcanic episodes and solving several stratigraphic uncertainties reported in the literature.The geochronological dataset show that the nephelinitic–phonolitic volcanism at Trindade was discontinuous throught time, being marked by periods of high volcanic activity and periods of quiescence, which suggests variable melt production and eruption rates. The peak of the volcanic activity occurred between 3.9 and 2.5 Ma (i.e., Lower Pliocene to Lower Pleistocene) that is represented by the TC, which correspond to the largest volume of volcanic deposits preserved in the island. The volcanic activity slows down progressively from 2.5 Ma to cease at ca. 1.6 Ma, period that is represented by the DF. This volcanism was followed by a quiescent period that lasted until the ephemeral nephelinitic volcanism of the MV (no age), VA (no age) and PF (ca. 0.25 Ma). Thus, the volcanic activity in Trindade was ceased completely at ca. 0.25 Ma, event registered in the uppermost volcanic deposits of the PF and that represents the last volcanic activity in the Brazilian territory. |
author2 |
programa de pos-graduacao em geologia insituto de geociencias, universidade federal do rio de janeiro Universidade do Estado do Rio de Janeiro - Faculdade de Geologia Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) Western Australian Argon Isotope Facility (WAAIF) The Institute for Geoscience Research Perth (TIGeR) School of Earth and Planetary Science Perth - Curtin university Curtin University Perth -Curtin University Perth -School of Earth and Planetary Science Perth - Curtin university Curtin University Perth -Curtin University Perth Centre for Mineral Technology (CETEM) Ministère de la Science et Technologie |
format |
Article in Journal/Newspaper |
author |
Pires, C. Bongiolo, E.M. Geraldes, C. Renac, C. Santos, A.C. Jourdan, F. Neumann, R. |
author_facet |
Pires, C. Bongiolo, E.M. Geraldes, C. Renac, C. Santos, A.C. Jourdan, F. Neumann, R. |
author_sort |
Pires, C. |
title |
New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic–phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean) |
title_short |
New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic–phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean) |
title_full |
New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic–phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean) |
title_fullStr |
New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic–phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean) |
title_full_unstemmed |
New 40Ar/39Ar ages and revised 40K/40Ar* data from nephelinitic–phonolitic volcanic successions of the Trindade Island (South Atlantic Ocean) |
title_sort |
new 40ar/39ar ages and revised 40k/40ar* data from nephelinitic–phonolitic volcanic successions of the trindade island (south atlantic ocean) |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01527342 https://doi.org/10.1016/j.jvolgeores.2016.09.020 |
long_lat |
ENVELOPE(-57.500,-57.500,-63.833,-63.833) |
geographic |
Morro |
geographic_facet |
Morro |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
ISSN: 0377-0273 Journal of Volcanology and Geothermal Research https://hal.science/hal-01527342 Journal of Volcanology and Geothermal Research, 2016, 327, pp.531 - 538. ⟨10.1016/j.jvolgeores.2016.09.020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jvolgeores.2016.09.020 hal-01527342 https://hal.science/hal-01527342 doi:10.1016/j.jvolgeores.2016.09.020 |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2016.09.020 |
container_title |
Journal of Volcanology and Geothermal Research |
container_volume |
327 |
container_start_page |
531 |
op_container_end_page |
538 |
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1784256092322136064 |