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Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and (14)C dating

Bjork, Anders Anker; Björck, Svante LU ; Cronholm, Anders LU ; Haile, James; Ljung, Karl LU and Porter, Charles (2011) In GFF 133(3-4). p.141-147
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
South Atlantic, Nightingale Island, peat bogs, subsurface topography, (14)C dating, young volcanism
in
GFF
volume
133
issue
3-4
pages
141 - 147
publisher
Geological Society of Sweden
external identifiers
  • wos:000299035100004
  • scopus:84859019847
ISSN
2000-0863
DOI
10.1080/11035897.2011.618275
project
MERGE
language
English
LU publication?
yes
id
edf3cead-a7e4-4f1b-aba4-fbeb92f73aed (old id 2494275)
date added to LUP
2012-06-04 14:24:39
date last changed
2017-01-01 04:09:43
@article{edf3cead-a7e4-4f1b-aba4-fbeb92f73aed,
  abstract     = {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.},
  author       = {Bjork, Anders Anker and Björck, Svante and Cronholm, Anders and Haile, James and Ljung, Karl and Porter, Charles},
  issn         = {2000-0863},
  keyword      = {South Atlantic,Nightingale Island,peat bogs,subsurface topography,(14)C dating,young volcanism},
  language     = {eng},
  number       = {3-4},
  pages        = {141--147},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {Possible Late Pleistocene volcanic activity on Nightingale Island, South Atlantic Ocean, based on geoelectrical resistivity measurements, sediment corings and (14)C dating},
  url          = {http://dx.doi.org/10.1080/11035897.2011.618275},
  volume       = {133},
  year         = {2011},
}