An estimate of post-depositional remanent magnetization lock-in depth in organic rich varved lake sediments
Snowball, Ian LU ; Mellström, Anette LU ; Ahlstrand, Emelie ; Haltia-Hovi, Eeva LU ; Nilsson, Andreas LU ; Ning, Wenxin LU ; Muscheler, Raimund LU
and Brauer, Achim
(2013)
In Global and Planetary Change
110.
p.264-277
- Abstract
- We studied the paleomagnetic properties of relatively organic rich, annually laminated (varved) sediments of Holocene age in Gyltigesjon, which is a lake in southern Sweden. An age-depth model was based on a regional lead pollution isochron and Bayesian modelling of radiocarbon ages of bulk sediments and terrestrial macrofossils, which included a radiocarbon wiggle-matched series of 873 varves that accumulated between 3000 and 2000 Cal a BP (Mellstrom et al., 2013). Mineral magnetic data and first order reversal curves suggest that the natural remanent magnetization is carried by stable single-domain grains of magnetite, probably of magnetosomal origin. Discrete samples taken from overlapping piston cores were used to produce smoothed... (More)
- We studied the paleomagnetic properties of relatively organic rich, annually laminated (varved) sediments of Holocene age in Gyltigesjon, which is a lake in southern Sweden. An age-depth model was based on a regional lead pollution isochron and Bayesian modelling of radiocarbon ages of bulk sediments and terrestrial macrofossils, which included a radiocarbon wiggle-matched series of 873 varves that accumulated between 3000 and 2000 Cal a BP (Mellstrom et al., 2013). Mineral magnetic data and first order reversal curves suggest that the natural remanent magnetization is carried by stable single-domain grains of magnetite, probably of magnetosomal origin. Discrete samples taken from overlapping piston cores were used to produce smoothed paleomagnetic secular variation (inclination and declination) and relative paleointensity data sets. Alternative temporal trends in the paleomagnetic data were obtained by correcting for paleomagnetic lock-in depths between 0 and 70 cm and taking into account changes in sediment accumulation rate. These temporal trends were regressed against reference curves for the same region (FENNOSTACK and FENNORPIS; Snowball et al., 2007). The best statistical matches to the reference curves are obtained when we apply lock-in depths of 21-34 cm to the Gyltigesjon paleomagnetic data, although these are most likely minimum estimates. Our study suggests that a significant paleomagnetic lock-in depth can affect the acquisition of post-depositional remanent magnetization even where bioturbation is absent and no mixed sediment surface layer exists. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4330081
- author
- Snowball, Ian
LU
; Mellström, Anette
LU
; Ahlstrand, Emelie
; Haltia-Hovi, Eeva
LU
; Nilsson, Andreas
LU
; Ning, Wenxin
LU
; Muscheler, Raimund
LU
and Brauer, Achim
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Paleomagnetic secular variation, Post-depositional remanent, magnetization, Lock-in depth, Varves
- in
- Global and Planetary Change
- volume
- 110
- pages
- 264 - 277
- publisher
- Elsevier
- external identifiers
-
- wos:000329333400002
- scopus:84888847647
- ISSN
- 1872-6364
- DOI
- 10.1016/j.gloplacha.2013.10.005
- language
- English
- LU publication?
- yes
- id
- 023eec96-964d-4102-bc89-a1704bd36b23 (old id 4330081)
- date added to LUP
- 2016-04-01 10:00:21
- date last changed
- 2022-02-24 21:25:57
@article{023eec96-964d-4102-bc89-a1704bd36b23,
abstract = {{We studied the paleomagnetic properties of relatively organic rich, annually laminated (varved) sediments of Holocene age in Gyltigesjon, which is a lake in southern Sweden. An age-depth model was based on a regional lead pollution isochron and Bayesian modelling of radiocarbon ages of bulk sediments and terrestrial macrofossils, which included a radiocarbon wiggle-matched series of 873 varves that accumulated between 3000 and 2000 Cal a BP (Mellstrom et al., 2013). Mineral magnetic data and first order reversal curves suggest that the natural remanent magnetization is carried by stable single-domain grains of magnetite, probably of magnetosomal origin. Discrete samples taken from overlapping piston cores were used to produce smoothed paleomagnetic secular variation (inclination and declination) and relative paleointensity data sets. Alternative temporal trends in the paleomagnetic data were obtained by correcting for paleomagnetic lock-in depths between 0 and 70 cm and taking into account changes in sediment accumulation rate. These temporal trends were regressed against reference curves for the same region (FENNOSTACK and FENNORPIS; Snowball et al., 2007). The best statistical matches to the reference curves are obtained when we apply lock-in depths of 21-34 cm to the Gyltigesjon paleomagnetic data, although these are most likely minimum estimates. Our study suggests that a significant paleomagnetic lock-in depth can affect the acquisition of post-depositional remanent magnetization even where bioturbation is absent and no mixed sediment surface layer exists. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.}},
author = {{Snowball, Ian and Mellström, Anette and Ahlstrand, Emelie and Haltia-Hovi, Eeva and Nilsson, Andreas and Ning, Wenxin and Muscheler, Raimund and Brauer, Achim}},
issn = {{1872-6364}},
keywords = {{Paleomagnetic secular variation; Post-depositional remanent; magnetization; Lock-in depth; Varves}},
language = {{eng}},
pages = {{264--277}},
publisher = {{Elsevier}},
series = {{Global and Planetary Change}},
title = {{An estimate of post-depositional remanent magnetization lock-in depth in organic rich varved lake sediments}},
url = {{http://dx.doi.org/10.1016/j.gloplacha.2013.10.005}},
doi = {{10.1016/j.gloplacha.2013.10.005}},
volume = {{110}},
year = {{2013}},
}