Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating
Tristan da Cunha is a volcanic island group situated in the central South Atlantic. The oldest of these islands, Nightingale Island, has an age of about 18Ma. In the interior of the island, there are several wetlands situated in topographic depressions. The ages of these basins have been unknown, an...
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ftcopenhagenunip:oai:pure.atira.dk:publications/78d6f31f-bfff-4b66-a202-bd5be73ae68b 2023-08-27T04:11:59+02:00 Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating Bjørk, Anders Anker Björck, Svante Cronholm, Anders Haile, James Seymour Ljung, Karl Porter, Charles 2011 https://curis.ku.dk/portal/da/publications/possible-late-pleistocene-volcanic-activity-on-nightingale-island-south-atlantic-ocean-based-on-geoelectrical-resistivity-measurements-sediment-corings-and-14c-dating(78d6f31f-bfff-4b66-a202-bd5be73ae68b).html https://doi.org/10.1080/11035897.2011.618275 eng eng info:eu-repo/semantics/closedAccess Bjørk , A A , Björck , S , Cronholm , A , Haile , J S , Ljung , K & Porter , C 2011 , ' Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating ' , GFF , vol. 133 , no. 3-4 , pp. 141-147 . https://doi.org/10.1080/11035897.2011.618275 article 2011 ftcopenhagenunip https://doi.org/10.1080/11035897.2011.618275 2023-08-02T23:01:02Z Tristan da Cunha is a volcanic island group situated in the central South Atlantic. The oldest of these islands, Nightingale Island, has an age of about 18Ma. In the interior of the island, there are several wetlands situated in topographic depressions. The ages of these basins have been unknown, and their genesis has been debated. Aiming towards the reconstruction of the geomorphological history of these basins, we conducted geoelectrical resistivity measurements to map the subsurface topography, extracted peat and sediment cores and dated the onset of sedimentation applying the radiocarbon method. The irregular shapes of the basins and the lack of clear erosional features indicate that they are not eruption craters and were not formed by erosion. Instead, we regard them as morphological depressions formed between ridges of trachytic lava flows and domes at a late stage of the formation of the volcanic edifice. The onset of sedimentation within these basins appears to have occurred between 24 and 37 ka with the highest situated wetland yielding the highest ages. These ages are very young compared to the timing of the main phase of the formation of the island, implying volcanic activity on the island during the Late Pleistocene. Article in Journal/Newspaper South Atlantic Ocean University of Copenhagen: Research Tristan ENVELOPE(140.900,140.900,-66.735,-66.735) GFF 133 3-4 141 147 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
Tristan da Cunha is a volcanic island group situated in the central South Atlantic. The oldest of these islands, Nightingale Island, has an age of about 18Ma. In the interior of the island, there are several wetlands situated in topographic depressions. The ages of these basins have been unknown, and their genesis has been debated. Aiming towards the reconstruction of the geomorphological history of these basins, we conducted geoelectrical resistivity measurements to map the subsurface topography, extracted peat and sediment cores and dated the onset of sedimentation applying the radiocarbon method. The irregular shapes of the basins and the lack of clear erosional features indicate that they are not eruption craters and were not formed by erosion. Instead, we regard them as morphological depressions formed between ridges of trachytic lava flows and domes at a late stage of the formation of the volcanic edifice. The onset of sedimentation within these basins appears to have occurred between 24 and 37 ka with the highest situated wetland yielding the highest ages. These ages are very young compared to the timing of the main phase of the formation of the island, implying volcanic activity on the island during the Late Pleistocene. |
format |
Article in Journal/Newspaper |
author |
Bjørk, Anders Anker Björck, Svante Cronholm, Anders Haile, James Seymour Ljung, Karl Porter, Charles |
spellingShingle |
Bjørk, Anders Anker Björck, Svante Cronholm, Anders Haile, James Seymour Ljung, Karl Porter, Charles Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating |
author_facet |
Bjørk, Anders Anker Björck, Svante Cronholm, Anders Haile, James Seymour Ljung, Karl Porter, Charles |
author_sort |
Bjørk, Anders Anker |
title |
Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating |
title_short |
Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating |
title_full |
Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating |
title_fullStr |
Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating |
title_full_unstemmed |
Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating |
title_sort |
possible late pleistocene volcanic activity on nightingale island, south atlantic ocean, based on geoelectrical resistivity measurements, sediment corings and 14 c dating |
publishDate |
2011 |
url |
https://curis.ku.dk/portal/da/publications/possible-late-pleistocene-volcanic-activity-on-nightingale-island-south-atlantic-ocean-based-on-geoelectrical-resistivity-measurements-sediment-corings-and-14c-dating(78d6f31f-bfff-4b66-a202-bd5be73ae68b).html https://doi.org/10.1080/11035897.2011.618275 |
long_lat |
ENVELOPE(140.900,140.900,-66.735,-66.735) |
geographic |
Tristan |
geographic_facet |
Tristan |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Bjørk , A A , Björck , S , Cronholm , A , Haile , J S , Ljung , K & Porter , C 2011 , ' Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and 14 C dating ' , GFF , vol. 133 , no. 3-4 , pp. 141-147 . https://doi.org/10.1080/11035897.2011.618275 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1080/11035897.2011.618275 |
container_title |
GFF |
container_volume |
133 |
container_issue |
3-4 |
container_start_page |
141 |
op_container_end_page |
147 |
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1775355716364664832 |