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Bacterial magnetite in Swedish varved lake-sediments: a potential bio-marker of environmental change

Snowball, Ian LU ; Zillén, Lovisa LU and Sandgren, Per LU (2002) In Quaternary International 88. p.13-19
Abstract
Detailed mineral magnetic measurements were carried out on three varved lake-sediment sequences in Sweden, which extend to ca. 7000 BC. The comparison of the magnetic properties of the organic rich varved lake-sediments with their respective catchment materials indicates that the magnetic properties of the sediments are dominated by relatively high concentrations of single-domain magnetite magnetosomes produced by magnetotactic bacteria. The dimictic nature of the lakes, which help form and preserve the varves due to the weakly oxic or suboxic environment, also appear to be suitable for a high degree of magnetosome preservation. The concentration of the magnetosomes in two of the sequences, as determined by mass specific magnetic... (More)
Detailed mineral magnetic measurements were carried out on three varved lake-sediment sequences in Sweden, which extend to ca. 7000 BC. The comparison of the magnetic properties of the organic rich varved lake-sediments with their respective catchment materials indicates that the magnetic properties of the sediments are dominated by relatively high concentrations of single-domain magnetite magnetosomes produced by magnetotactic bacteria. The dimictic nature of the lakes, which help form and preserve the varves due to the weakly oxic or suboxic environment, also appear to be suitable for a high degree of magnetosome preservation. The concentration of the magnetosomes in two of the sequences, as determined by mass specific magnetic measurements, exhibits a positive linear relationship with the total organic carbon content and suggests that magnetic remanence measurements reflect lake productivity, via processes of organic matter accumulation and decomposition. Further research should focus on the potential to use the fossil magnetosomes as proxy-climate/environmental change indicators and as recorders of geomagnetic field variations and behaviour. (C) 2002 Elsevier Science Ltd and INQUA. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Quaternary International
volume
88
pages
13 - 19
publisher
Elsevier
external identifiers
  • wos:000173520700003
  • scopus:0036149346
ISSN
1873-4553
DOI
10.1016/S1040-6182(01)00069-6
language
English
LU publication?
yes
id
727a1676-871c-4f22-ab71-f3975ea41c34 (old id 344058)
date added to LUP
2007-11-14 12:50:08
date last changed
2017-11-12 03:24:52
@article{727a1676-871c-4f22-ab71-f3975ea41c34,
  abstract     = {Detailed mineral magnetic measurements were carried out on three varved lake-sediment sequences in Sweden, which extend to ca. 7000 BC. The comparison of the magnetic properties of the organic rich varved lake-sediments with their respective catchment materials indicates that the magnetic properties of the sediments are dominated by relatively high concentrations of single-domain magnetite magnetosomes produced by magnetotactic bacteria. The dimictic nature of the lakes, which help form and preserve the varves due to the weakly oxic or suboxic environment, also appear to be suitable for a high degree of magnetosome preservation. The concentration of the magnetosomes in two of the sequences, as determined by mass specific magnetic measurements, exhibits a positive linear relationship with the total organic carbon content and suggests that magnetic remanence measurements reflect lake productivity, via processes of organic matter accumulation and decomposition. Further research should focus on the potential to use the fossil magnetosomes as proxy-climate/environmental change indicators and as recorders of geomagnetic field variations and behaviour. (C) 2002 Elsevier Science Ltd and INQUA. All rights reserved.},
  author       = {Snowball, Ian and Zillén, Lovisa and Sandgren, Per},
  issn         = {1873-4553},
  language     = {eng},
  pages        = {13--19},
  publisher    = {Elsevier},
  series       = {Quaternary International},
  title        = {Bacterial magnetite in Swedish varved lake-sediments: a potential bio-marker of environmental change},
  url          = {http://dx.doi.org/10.1016/S1040-6182(01)00069-6},
  volume       = {88},
  year         = {2002},
}