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Holocene 17 (8)
Title
The title of the publication or report
Title:
Holocene 17 (8)
Series
The series the publication or report is included in
Series:
The Holocene
Volume
Volume number and part
Volume:
17 (8)
Publication Type
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Publication Type:
Journal
Editor
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Editor:
John A Matthews
Publisher
The publisher of the publication or report
Publisher:
Sage Publications
Year of Publication
The year the book, article or report was published
Year of Publication:
2007
Source
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Source:
BIAB (The British & Irish Archaeological Bibliography (BIAB))
Relations
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Relations:
URI:
http://hol.sagepub.com/content/vol17/issue8/
Created Date
The date the record of the pubication was first entered
Created Date:
21 Aug 2008
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Article Title
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Abstract
Sources of fine-grained magnetic minerals in sediments: a problem revisited
Frank Oldfield
1265 - 1271
Progress in the discrimination of fine-grained magnetic minerals in sediments and sediment sources using measurements of magnetic susceptibility at two frequencies and of magnetic remanence generated by a combination of direct and alternating currents is summarized. The former measurements yield values for low field and frequency-dependent susceptibility (lf and fd, respectively). The latter generate an Anhysteretic Remanent Magnetisation (ARM) that, when normalized to the DC bias field, can be represented as the susceptibility of ARM (ARM). Using quotients derived from lf, fd and ARM to generate bi-logarithmic plots, it is possible to discriminate between assemblages dominated by magnetic minerals formed through pedogenesis and those arising from the presence of magnetotactic bacteria that use chains of magnetic particles to seek optimum environments in surface sediments. Sediments to which both types of magnetic mineral contribute occupy positions between the envelopes of values typical of soil-derived and magnetosome-derived assemblages. Fire also appears to give rise to a distinctive envelope of values indicative of smaller magnetic grain sizes, whilst the signature of extracellular magnetite is indicative of the finest grain sizes recorded.