Magnetic properties of loess grain size fractions from the section at Paks (Hungary)
作者： M Sartori , F Heller , T Forster , M Borkovec , J Hammann
DOI: 10.1016/S0031-9201(99)00118-1
关键词: Particle-size distribution 、 Hysteresis 、 Ferromagnetism 、 Paramagnetism 、 Rock magnetism 、 Mineralogy 、 Loess 、 Grain size 、 Magnetization 、 Geology
摘要: Abstract The approximately 50-m thick loess/palaeosol sequence at Paks brickyard (Hungary) was deposited largely during the Brunhes normal polarity chron and its magnetic properties resemble those of similar sections in Europe, Central Asia China. In order to get information on grain size dependence some parameters, two loess palaeosol samples were separated into a number fractions. separation method employs consecutive sedimentation centrifugation steps performed bulk suspended water diluted with Calgon. Ten fractions obtained, ranging from 50 μm down 10 nm. Several parameters different have been measured, room temperature (low field susceptibility, hysteresis parameters) low (susceptibility thermoremanent magnetisation). They show strong for ferromagnetic minerals. Low measurements allow discrimination paramagnetic vs. signal give distribution very fine minerals mineral types carrying signal. Strong relationships between weathering processes, destruction possibly iron-hydroxides, enhancement are observed.
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