Open AccessRock magnetic properties of recent soils from northeastern Bulgaria
Author(s) -
Jordanova Diana,
Petrovsky Eduard,
Jordanova Neli,
Evlogiev Jordan,
Butchvarova Vesselina
Publication year - 1997
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1997.tb01569.x
Subject(s) - pedogenesis , loess , maghemite , geology , soil water , concretion , environmental magnetism , superparamagnetism , geochemistry , single domain , silt , mineralogy , grain size , magnetic mineralogy , clay minerals , rock magnetism , carbonate , soil science , magnetite , remanence , magnetization , geomorphology , magnetic domain , materials science , paleontology , magnetic field , hematite , physics , quantum mechanics , metallurgy
Summary In this paper, basic rock magnetic studies of Holocene loess‐soil samples from northeastern Bulgaria are reported. The sites are related to the Danube river and located at different distances southwards, thus representing various pedogenic conditions. The study is primarily aimed at determining the main magnetic carrier(s) and their physical characteristics (grain‐size distribution, magnetic enhancement, etc.). Oxyhydroxides, maghemite and titanomagnetites of various oxidation degrees are assumed to be the main ferromagnetic minerals present. Our results suggest that the uppermost part of recent soil profiles is rich in stable, near‐single‐domain (SD) particles, while the illuvial horizons are characterized by a gradual decrease in grain sizes, from highly viscous to a true superparamagnetic (SP) domain state. The properties of samples from carbonate‐rich horizons of recent soils are basically controlled by detrital minerals, while those from sites with more intensive pedogenesis and especially grey forest soils are influenced by strongly magnetic minerals formed ‘ in situ ’.