Detection of the pedogenic magnetic fraction in volcanic soils developed on basalts using frequency-dependent magnetic susceptibility: comparison of two instruments
| Autor: | Aleš Kapička, Hana Hanzlikova, Hana Grison, Eduard Petrovsky |
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| Rok vydání: | 2017 |
| Předmět: |
Basalt
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Environmental magnetism Geochemistry 010502 geochemistry & geophysics 01 natural sciences Magnetic susceptibility Geophysics Nuclear magnetic resonance Pedogenesis Volcano Geochemistry and Petrology Soil water Magnetic fraction Geology 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Journal International. 209:654-660 |
| ISSN: | 1365-246X 0956-540X |
| DOI: | 10.1093/gji/ggx037 |
| Popis: | In studies of the magnetic properties of soils, the frequency-dependent magnetic susceptibility percentage (χFD%) is often used for the identification of ultrafine magnetically superparamagnetic/stable single-domain (SP/SSD) particles. This parameter is commonly used as an indicator for increased pedogenesis. In strongly magnetic soils, the SP/SSD magnetic signal (mostly bio-pedogenic) may be masked by lithological signals; making pedogenesis hard to detect. In this study, we compare results for the detection of ultrafine SP/SSD magnetic particles in andic soils using two instruments: a Bartington MS2B dual-frequency meter and an AGICO Kappabridge MFK1-FA. In particular, the study focuses on the effect of pedogenesis by investigating the relationship between specific soil magnetic and chemical properties (soil organic carbon and pHH2O). The values of χFD% obtained with the MS2B varied from 2.4 to 5.9 per cent, and mass-specific magnetic susceptibility (χLF) from 283 to 1688 × 10−8 m3 kg−1, while values of χFD% and χLF obtained with the MFK1-FA varied from 2.7 to 8.2 per cent and from 299 to 1859 × 10−8 m3 kg−1, respectively. Our results suggest that the detection of the SP/SSD magnetic fraction can be accomplished by comparing relative trends of χFD% along the soil profile. Moreover, the discrimination between bio-pedogenic and lithogenic magnetic contributions in the SP/SSD fraction is possible by comparing the χFD% and χLF data determined in the fine earth ( |
| Databáze: | OpenAIRE |
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