Diversity and peculiarities of soil formation in eolian landscapes – Insights from the mineral magnetic records
作者： Diana Jordanova , Neli Jordanova
DOI: 10.1016/J.EPSL.2019.115956
关键词:
摘要: Abstract Magnetic properties of loess-paleosol sequences are widely utilized as sensitive, easily-obtained and reliable proxy archives past climate change in continental settings. However, soil formation aeolian landscapes may occur under different changing conditions dust sedimentation, which will affect the growth development pedogenic magnetic component. This phenomenon is explored our study by analyzing depth variations following characteristics: frequency dependent susceptibility, anhysteretic susceptibility ratio between isothermal remanent magnetization acquired a 100 mT back field (χarm/IRM-100 mT), along three profiles from NE Bulgaria. A conceptual model for time evolution grain size fraction with proposed, build upon mechanism – accretional or stable land surfaces, combination two. Another remanence 300 divided low (IRM-300 mT/χ) changes silt to clay fractions, indicative sedimentation regimes during glacial-interglacial transitions. According proposed model, verified signature Holocene soils Bulgaria, discrimination developed without additions forming period can be done. Accretional characterized parallel sensitive proxies. Soils, at landscape show gradation depths maximum enhancement various proxies occurs deepest occurrence χfd, followed χarm χarm/IRM-100 mT. implication new that mean coercivity component higher than eolian input equal temperature because soils' thermal gradient depths, minerals form two The results revealed (So) has soil-forming paleosols same sites.
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