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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2494275
- author
- Bjork, Anders Anker
; Björck, Svante
LU
; Cronholm, Anders
LU
; Haile, James
; Ljung, Karl
LU
and Porter, Charles
- organization
- publishing date
- 2011
- 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
- Taylor & Francis
- external identifiers
-
- wos:000299035100004
- scopus:84859019847
- ISSN
- 2000-0863
- DOI
- 10.1080/11035897.2011.618275
- language
- English
- LU publication?
- yes
- id
- edf3cead-a7e4-4f1b-aba4-fbeb92f73aed (old id 2494275)
- date added to LUP
- 2016-04-01 11:06:00
- date last changed
- 2023-01-02 18:39:20
@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}},
keywords = {{South Atlantic; Nightingale Island; peat bogs; subsurface topography; (14)C dating; young volcanism}},
language = {{eng}},
number = {{3-4}},
pages = {{141--147}},
publisher = {{Taylor & Francis}},
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}},
doi = {{10.1080/11035897.2011.618275}},
volume = {{133}},
year = {{2011}},
}