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An integrated palaeoenvironmental investigation of a 6200 year old peat sequence from Ile de la Possession, Iles Crozet, sub-Antarctica

Van der Putten, Nathalie LU ; Hebrard, J. -P.; Verbruggen, C.; de Vijver, B. Van; Disnar, J. -R.; Spassov, S.; de Beaulieu, J-L; De Dapper, M.; Keravis, D. and Hus, J., et al. (2008) In Palaeogeography, Palaeoclimatology, Palaeoecology 270(1-2). p.179-195
Abstract
A 6200 year old peat sequence, cored in a volcanic crater on the sub-Antarctic Ile de la Possession (Iles Crozet), has been investigated, based on a multi-proxy approach. The methods applied are macrobotanical (mosses, seeds and fruits) and diatom analyses, complemented by geochemical (Rock-Eval6) and rock magnetic measurements. The chronology of the core is based on 5 radiocarbon dates. When combining all the proxy data the following changes could be inferred. From the onset of the peat formation (6200 cal yr BP) until ca. 5550 cal yr BR biological production was high and climatic conditions must have been relatively warm. At ca. 5550 cal yr BP a shift to low biological production occurred, lasting until ca. 4600 cal yr BR During this... (More)
A 6200 year old peat sequence, cored in a volcanic crater on the sub-Antarctic Ile de la Possession (Iles Crozet), has been investigated, based on a multi-proxy approach. The methods applied are macrobotanical (mosses, seeds and fruits) and diatom analyses, complemented by geochemical (Rock-Eval6) and rock magnetic measurements. The chronology of the core is based on 5 radiocarbon dates. When combining all the proxy data the following changes could be inferred. From the onset of the peat formation (6200 cal yr BP) until ca. 5550 cal yr BR biological production was high and climatic conditions must have been relatively warm. At ca. 5550 cal yr BP a shift to low biological production occurred, lasting until ca. 4600 cal yr BR During this period the organic matter is well preserved, pointing to a cold and/or wet environment. At ca. 4600 cal yr BP, biological production increased again. From ca. 4600 cal yr BP until ca. 4100 cal yr BP a "hollow and hummock" micro topography developed at the peat surface, resulting in the presence of a mixture of wetter and drier species in the macrobotanical record. After ca. 4100 cal yr BP, the wet species disappear and a generally drier, acidic bog came into existence. A major shift in all the proxy data is observed at ca. 2800 cal yr BR pointing to wetter and especially windier climatic conditions on the island probably caused by an intensification and/or latitudinal shift of the southern westerly belt. Caused by a stronger wind regime, erosion of the peat surface occurred at that time and a lake was formed in the peat deposits of the crater, which is still present today. (C) 2008 Elsevier B.V. All rights reserved. (Less)
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subject
keywords
Diatoms, Geochemical analysis, Rock magnetism, Macrofossil record, Palaeoecology, Palaeoclimate, Holocene, Sub-Antarctic, Iles Crozet
in
Palaeogeography, Palaeoclimatology, Palaeoecology
volume
270
issue
1-2
pages
179 - 195
publisher
Elsevier
external identifiers
  • wos:000261853800015
  • scopus:56249109727
ISSN
1872-616X
DOI
10.1016/j.palaeo.2008.09.014
language
English
LU publication?
no
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1f9af624-cbfd-4561-8e33-99692e3e8539 (old id 1969770)
date added to LUP
2011-05-26 07:38:10
date last changed
2017-07-23 03:46:19
@article{1f9af624-cbfd-4561-8e33-99692e3e8539,
  abstract     = {A 6200 year old peat sequence, cored in a volcanic crater on the sub-Antarctic Ile de la Possession (Iles Crozet), has been investigated, based on a multi-proxy approach. The methods applied are macrobotanical (mosses, seeds and fruits) and diatom analyses, complemented by geochemical (Rock-Eval6) and rock magnetic measurements. The chronology of the core is based on 5 radiocarbon dates. When combining all the proxy data the following changes could be inferred. From the onset of the peat formation (6200 cal yr BP) until ca. 5550 cal yr BR biological production was high and climatic conditions must have been relatively warm. At ca. 5550 cal yr BP a shift to low biological production occurred, lasting until ca. 4600 cal yr BR During this period the organic matter is well preserved, pointing to a cold and/or wet environment. At ca. 4600 cal yr BP, biological production increased again. From ca. 4600 cal yr BP until ca. 4100 cal yr BP a "hollow and hummock" micro topography developed at the peat surface, resulting in the presence of a mixture of wetter and drier species in the macrobotanical record. After ca. 4100 cal yr BP, the wet species disappear and a generally drier, acidic bog came into existence. A major shift in all the proxy data is observed at ca. 2800 cal yr BR pointing to wetter and especially windier climatic conditions on the island probably caused by an intensification and/or latitudinal shift of the southern westerly belt. Caused by a stronger wind regime, erosion of the peat surface occurred at that time and a lake was formed in the peat deposits of the crater, which is still present today. (C) 2008 Elsevier B.V. All rights reserved.},
  author       = {Van der Putten, Nathalie and Hebrard, J. -P. and Verbruggen, C. and de Vijver, B. Van and Disnar, J. -R. and Spassov, S. and de Beaulieu, J-L and De Dapper, M. and Keravis, D. and Hus, J. and Thouveny, N. and Frenot, Y.},
  issn         = {1872-616X},
  keyword      = {Diatoms,Geochemical analysis,Rock magnetism,Macrofossil record,Palaeoecology,Palaeoclimate,Holocene,Sub-Antarctic,Iles Crozet},
  language     = {eng},
  number       = {1-2},
  pages        = {179--195},
  publisher    = {Elsevier},
  series       = {Palaeogeography, Palaeoclimatology, Palaeoecology},
  title        = {An integrated palaeoenvironmental investigation of a 6200 year old peat sequence from Ile de la Possession, Iles Crozet, sub-Antarctica},
  url          = {http://dx.doi.org/10.1016/j.palaeo.2008.09.014},
  volume       = {270},
  year         = {2008},
}