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Magnetic susceptibility as a pedogenic proxy for grouping of geochemical transects in landscapes

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Magnetic susceptibility as a pedogenic proxy for grouping of geochemical transects in landscapes. / Cervi, E.C.; Maher, B.; Poliseli, P.C. et al.
In: Journal of Applied Geophysics, Vol. 169, 01.10.2019, p. 109-117.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Cervi, EC, Maher, B, Poliseli, PC, de Souza Junior, IG & da Costa, ACS 2019, 'Magnetic susceptibility as a pedogenic proxy for grouping of geochemical transects in landscapes', Journal of Applied Geophysics, vol. 169, pp. 109-117. https://doi.org/10.1016/j.jappgeo.2019.06.017

APA

Cervi, E. C., Maher, B., Poliseli, P. C., de Souza Junior, I. G., & da Costa, A. C. S. (2019). Magnetic susceptibility as a pedogenic proxy for grouping of geochemical transects in landscapes. Journal of Applied Geophysics, 169, 109-117. https://doi.org/10.1016/j.jappgeo.2019.06.017

Vancouver

Cervi EC, Maher B, Poliseli PC, de Souza Junior IG, da Costa ACS. Magnetic susceptibility as a pedogenic proxy for grouping of geochemical transects in landscapes. Journal of Applied Geophysics. 2019 Oct 1;169:109-117. Epub 2019 Jun 29. doi: 10.1016/j.jappgeo.2019.06.017

Author

Cervi, E.C. ; Maher, B. ; Poliseli, P.C. et al. / Magnetic susceptibility as a pedogenic proxy for grouping of geochemical transects in landscapes. In: Journal of Applied Geophysics. 2019 ; Vol. 169. pp. 109-117.

Bibtex

@article{d234816062254af89e2f54e87b9b50f8,
title = "Magnetic susceptibility as a pedogenic proxy for grouping of geochemical transects in landscapes",
abstract = "Magnetic susceptibility (χ lf) is a sensitive, fast, and accurate technique to detect soil pedogenic processes and features, and can improve understanding of soil-forming factors. The aim of this study was to determine catenary groupings of geochemical segments by identifying the relationship between magnetic susceptibility and the soil-forming factors within and along the landscape. Soil physical and chemical properties, as well as soil mineralogy were evaluated in twenty-two topsoil samples from three different landscapes in southern Brazil. The bulk χ lf and frequency-dependent susceptibility (χ fd) were also measured, represented by i) air-dried fine earth (< n μm, χ lf ADFE) ii) after dithionite-citrate-bicarbonate treatment (χ lf CBD), and iii) the parent material (χ lf ROCK). Geochemical segments were grouped using multivariate analysis. Our results indicate that soil parent material and climate, are first order factors for the pedogenic enhancement of magnetic minerals. Magnetic susceptibility of air-dried fine earth (χ lf ADFE) is widely variable, from 11.00 to 2.075 × 10 −8 m 3 kg −1. χ lf was higher in soils developed on basalt, and much lower for soils developed on sandstone. χ lf ADFE also reveals a strong positive linear correlation with χ lf CBD (r = 0.96) and a moderate positive linear correlation with “free” and total Fe content (r = 0.49 and 0.69, respectively). The χ fd (< 2%) indicates samples in which either non-SP grains dominate the assemblage or where the SP fraction is <0.03 nm. After CBD dissolution there is an increase in χ lf values. The rate of iron weathering and iron release, driven by hydrolysis and oxidation, and reductive dissolution of magnetite affect the formation and/or persistence of secondary iron oxides in some of the soil transects. Both principal component analysis (PCA) and cluster analysis group soils from a) crest and upper slope locations, b) down slope and sandstone areas, and c) valley floors, indicating that magnetic susceptibility is an effective proxy for soil properties for grouping and identifying pedogenic/geochemical segments along a landscape of 360 km 2. ",
keywords = "Catena, Geochemical landscape, Iron oxide, Magnetite, Multivariate analysis, Pedogenesis, Analytical geochemistry, Cluster analysis, Dissolution, Iron oxides, Magnetic susceptibility, Magnetism, Minerals, Multivariant analysis, Principal component analysis, Sandstone, Weathering, Frequency dependent susceptibility, Linear correlation, Multi variate analysis, Reductive dissolution, Soil physical and chemical properties, Soils",
author = "E.C. Cervi and B. Maher and P.C. Poliseli and {de Souza Junior}, I.G. and {da Costa}, A.C.S.",
year = "2019",
month = oct,
day = "1",
doi = "10.1016/j.jappgeo.2019.06.017",
language = "English",
volume = "169",
pages = "109--117",
journal = "Journal of Applied Geophysics",
issn = "0926-9851",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Magnetic susceptibility as a pedogenic proxy for grouping of geochemical transects in landscapes

AU - Cervi, E.C.

AU - Maher, B.

AU - Poliseli, P.C.

AU - de Souza Junior, I.G.

AU - da Costa, A.C.S.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - Magnetic susceptibility (χ lf) is a sensitive, fast, and accurate technique to detect soil pedogenic processes and features, and can improve understanding of soil-forming factors. The aim of this study was to determine catenary groupings of geochemical segments by identifying the relationship between magnetic susceptibility and the soil-forming factors within and along the landscape. Soil physical and chemical properties, as well as soil mineralogy were evaluated in twenty-two topsoil samples from three different landscapes in southern Brazil. The bulk χ lf and frequency-dependent susceptibility (χ fd) were also measured, represented by i) air-dried fine earth (< n μm, χ lf ADFE) ii) after dithionite-citrate-bicarbonate treatment (χ lf CBD), and iii) the parent material (χ lf ROCK). Geochemical segments were grouped using multivariate analysis. Our results indicate that soil parent material and climate, are first order factors for the pedogenic enhancement of magnetic minerals. Magnetic susceptibility of air-dried fine earth (χ lf ADFE) is widely variable, from 11.00 to 2.075 × 10 −8 m 3 kg −1. χ lf was higher in soils developed on basalt, and much lower for soils developed on sandstone. χ lf ADFE also reveals a strong positive linear correlation with χ lf CBD (r = 0.96) and a moderate positive linear correlation with “free” and total Fe content (r = 0.49 and 0.69, respectively). The χ fd (< 2%) indicates samples in which either non-SP grains dominate the assemblage or where the SP fraction is <0.03 nm. After CBD dissolution there is an increase in χ lf values. The rate of iron weathering and iron release, driven by hydrolysis and oxidation, and reductive dissolution of magnetite affect the formation and/or persistence of secondary iron oxides in some of the soil transects. Both principal component analysis (PCA) and cluster analysis group soils from a) crest and upper slope locations, b) down slope and sandstone areas, and c) valley floors, indicating that magnetic susceptibility is an effective proxy for soil properties for grouping and identifying pedogenic/geochemical segments along a landscape of 360 km 2.

AB - Magnetic susceptibility (χ lf) is a sensitive, fast, and accurate technique to detect soil pedogenic processes and features, and can improve understanding of soil-forming factors. The aim of this study was to determine catenary groupings of geochemical segments by identifying the relationship between magnetic susceptibility and the soil-forming factors within and along the landscape. Soil physical and chemical properties, as well as soil mineralogy were evaluated in twenty-two topsoil samples from three different landscapes in southern Brazil. The bulk χ lf and frequency-dependent susceptibility (χ fd) were also measured, represented by i) air-dried fine earth (< n μm, χ lf ADFE) ii) after dithionite-citrate-bicarbonate treatment (χ lf CBD), and iii) the parent material (χ lf ROCK). Geochemical segments were grouped using multivariate analysis. Our results indicate that soil parent material and climate, are first order factors for the pedogenic enhancement of magnetic minerals. Magnetic susceptibility of air-dried fine earth (χ lf ADFE) is widely variable, from 11.00 to 2.075 × 10 −8 m 3 kg −1. χ lf was higher in soils developed on basalt, and much lower for soils developed on sandstone. χ lf ADFE also reveals a strong positive linear correlation with χ lf CBD (r = 0.96) and a moderate positive linear correlation with “free” and total Fe content (r = 0.49 and 0.69, respectively). The χ fd (< 2%) indicates samples in which either non-SP grains dominate the assemblage or where the SP fraction is <0.03 nm. After CBD dissolution there is an increase in χ lf values. The rate of iron weathering and iron release, driven by hydrolysis and oxidation, and reductive dissolution of magnetite affect the formation and/or persistence of secondary iron oxides in some of the soil transects. Both principal component analysis (PCA) and cluster analysis group soils from a) crest and upper slope locations, b) down slope and sandstone areas, and c) valley floors, indicating that magnetic susceptibility is an effective proxy for soil properties for grouping and identifying pedogenic/geochemical segments along a landscape of 360 km 2.

KW - Catena

KW - Geochemical landscape

KW - Iron oxide

KW - Magnetite

KW - Multivariate analysis

KW - Pedogenesis

KW - Analytical geochemistry

KW - Cluster analysis

KW - Dissolution

KW - Iron oxides

KW - Magnetic susceptibility

KW - Magnetism

KW - Minerals

KW - Multivariant analysis

KW - Principal component analysis

KW - Sandstone

KW - Weathering

KW - Frequency dependent susceptibility

KW - Linear correlation

KW - Multi variate analysis

KW - Reductive dissolution

KW - Soil physical and chemical properties

KW - Soils

U2 - 10.1016/j.jappgeo.2019.06.017

DO - 10.1016/j.jappgeo.2019.06.017

M3 - Journal article

VL - 169

SP - 109

EP - 117

JO - Journal of Applied Geophysics

JF - Journal of Applied Geophysics

SN - 0926-9851

ER -