Secondary ferrimagnetic minerals in Welsh soils: a comparison of mineral magnetic detection methods and implications for mineral formation

J.A. Dearing, P.M. Bird, R.J.L. Dann, Stephen F. Benjamin

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Abstract

A range of low-temperature and isothermal magnetic measurements are used to identify the secondary ferrimagnetic mineral (SFM) grain sizes in 10 representative soil samples from Wales. A comparison of percentage frequency-dependent susceptibility (χFD percentage) and low-temperature remanence measurements shows that they are sensitive to different ranges of superparamagnetic (SP) grains. The relative distributions of SP grains and stable single domain (SSD) grains are similar in nine of the samples. Typical distributions for soils dominated by SFMs are ±±20-30 per cent SSD and 70–80 per cent SP. Multidomain (MD) grains were not detected in the samples studied. There is evidence that some soils contain significant numbers of ultrafine SP grains
Original languageEnglish
Pages (from-to)727-736
JournalGeophysical Journal International
Volume130
Issue number3
DOIs
Publication statusPublished - 1997

Bibliographical note

This article has been accepted for publication in Geophysical Journal International ©: 1997 RAS. Published by Oxford University Press [on behalf of The Royal Astronomical Society]. All rights reserved.

Keywords

  • frequency-dependent susceptibility
  • low-temperature remanence
  • soil magnetism

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