Detection of the pedogenic magnetic fraction in volcanic soils developed on basalts using frequency-dependent magnetic susceptibility: comparison of two instruments

0470216 - GFÚ 2018 RIV GB eng J - Článek v odborném periodiku
Grison, Hana - Petrovský, Eduard - Kapička, Aleš - Hanzlíková, Hana
Detection of the pedogenic magnetic fraction in volcanic soils developed on basalts using frequency-dependent magnetic susceptibility: comparison of two instruments.
Geophysical Journal International. Roč. 209, č. 2 (2017), s. 654-660. ISSN 0956-540X. E-ISSN 1365-246X
Grant CEP: GA ČR GA13-10775S; GA MŠMT(CZ) LG15036
Institucionální podpora: RVO:67985530
Klíčová slova: magnetic properties * environmental magnetism * rock and mineral magnetism
Obor OECD: Physical geography
Impakt faktor: 2.528, rok: 2017

In studies of the magnetic properties of soils, the frequency-dependent magnetic susceptibility percentage (X-FD%) is often used for the identification of ultrafine magnetically superpara-magnetic/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 pH(H2O)). The values of X-FD% obtained with the MS2B varied from 2.4 to 5.9 per cent, and mass-specific magnetic susceptibility (X-LF) from 283 to 1688x10(-8) m(3) kg(-1), while values of X-FD% and X-LF obtained with the MFK1-FA varied from 2.7 to 8.2 per cent and from 299 to 1859 x 10(-8) m(3) kg(-1), respectively. Our results suggest that the detection of the SP/SSD magnetic fraction can be accomplished by comparing relative trends of X-FD% along the soil profile. Moreover, the discrimination between bio-pedogenic and lithogenic magnetic contributions in the SP/SSD fraction is possible by comparing the X-FD% and X-LF data determined in the fine earth (<2 mm) and the coarse fraction (4-10 mm) samples down the soil profile.
Trvalý link: http://hdl.handle.net/11104/0267924