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Testing competing hypotheses for soil magnetic susceptibility using a new chemical kinetic model

Testing competing hypotheses for soil magnetic susceptibility using a new chemical kinetic model
Testing competing hypotheses for soil magnetic susceptibility using a new chemical kinetic model
A chemical kinetic model is presented for the formation and accumulation of secondary ferrimagnetic minerals (SFMs) in soil constructed using experimentally determined rate constants and validated against field data. The primary objective is to critically assess the significance of competing causal mechanisms and disputed environmental controls under temperate conditions. Four findings are important in relation to current application of soil magnetic susceptibility data. First, transformation of hydrous ferric oxide to magnetite should dominate SFM formation, controlled primarily by parent material ferrous silicate concentration and climate. Second, abiotic reactions should account for most of the SFM production; the most significant impact of high Fe2+ concentrations created by dissimilatory iron-reducing bacteria is enhanced export of iron from the soil in runoff. Third, the model predicts a correlation between hematite and magnetite concentrations, weakening field support for direct transformation of hydrous ferric oxide to maghemite. Fourth, magnetic susceptibility enhancement should increase strongly with weathering duration.

0091-7613
1059-1062
Boyle, John F.
a7e2d8f4-a38f-4719-8f8e-aafd12b3e8a1
Dearing, John A.
dff37300-b8a6-4406-ad84-89aa01de03d7
Blundell, Antony
e29b943e-9e1d-45c0-8c02-de306943e697
Hannam, Jacqueline A.
cc5031bc-1fc7-4f00-8fb4-8d0dfb412e89
Boyle, John F.
a7e2d8f4-a38f-4719-8f8e-aafd12b3e8a1
Dearing, John A.
dff37300-b8a6-4406-ad84-89aa01de03d7
Blundell, Antony
e29b943e-9e1d-45c0-8c02-de306943e697
Hannam, Jacqueline A.
cc5031bc-1fc7-4f00-8fb4-8d0dfb412e89

Boyle, John F., Dearing, John A., Blundell, Antony and Hannam, Jacqueline A. (2010) Testing competing hypotheses for soil magnetic susceptibility using a new chemical kinetic model. Geology, 38 (12), 1059-1062. (doi:10.1130/G31514.1).

Record type: Article

Abstract

A chemical kinetic model is presented for the formation and accumulation of secondary ferrimagnetic minerals (SFMs) in soil constructed using experimentally determined rate constants and validated against field data. The primary objective is to critically assess the significance of competing causal mechanisms and disputed environmental controls under temperate conditions. Four findings are important in relation to current application of soil magnetic susceptibility data. First, transformation of hydrous ferric oxide to magnetite should dominate SFM formation, controlled primarily by parent material ferrous silicate concentration and climate. Second, abiotic reactions should account for most of the SFM production; the most significant impact of high Fe2+ concentrations created by dissimilatory iron-reducing bacteria is enhanced export of iron from the soil in runoff. Third, the model predicts a correlation between hematite and magnetite concentrations, weakening field support for direct transformation of hydrous ferric oxide to maghemite. Fourth, magnetic susceptibility enhancement should increase strongly with weathering duration.

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More information

Published date: 1 December 2010

Identifiers

Local EPrints ID: 169173
URI: https://eprints.soton.ac.uk/id/eprint/169173
ISSN: 0091-7613
PURE UUID: 425060aa-de55-419a-ba3d-06255479d042
ORCID for John A. Dearing: ORCID iD orcid.org/0000-0002-1466-9640

Catalogue record

Date deposited: 13 Dec 2010 09:48
Last modified: 19 Jul 2019 00:56

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