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

doi:10.1111/j.1365-246X.1997.tb01867.x

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

College of Engineering, Environment & Science

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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 language	English
Pages (from-to)	727-736
Journal	Geophysical Journal International
Volume	130
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-246X.1997.tb01867.x
Publication status	Published - 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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10.1111/j.1365-246X.1997.tb01867.x

Secondary ferrimagnetic mineralsFinal published version, 0.99 MB

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

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",

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note = "This article has been accepted for publication in Geophysical Journal International {\textcopyright}: 1997 RAS. Published by Oxford University Press [on behalf of The Royal Astronomical Society]. All rights reserved.",

year = "1997",

doi = "10.1111/j.1365-246X.1997.tb01867.x",

language = "English",

volume = "130",

pages = "727--736",

journal = "Geophysical Journal International",

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T1 - Secondary ferrimagnetic minerals in Welsh soils: a comparison of mineral magnetic detection methods and implications for mineral formation

AU - Dearing, J.A.

AU - Bird, P.M.

AU - Dann, R.J.L.

AU - Benjamin, Stephen F.

N1 - 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.

PY - 1997

Y1 - 1997

N2 - 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

AB - 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

KW - frequency-dependent susceptibility

KW - low-temperature remanence

KW - soil magnetism

U2 - 10.1111/j.1365-246X.1997.tb01867.x

DO - 10.1111/j.1365-246X.1997.tb01867.x

M3 - Article

SN - 0956-540X

SN - 1365-246X

VL - 130

SP - 727

EP - 736

JO - Geophysical Journal International

JF - Geophysical Journal International

IS - 3

ER -

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

Abstract

Bibliographical note

Keywords

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