International Symposium on Loess, Soils and Climate Change in Southern Eurasia , 2014-10-15

Title : ( Clay mineralogical changes in loess-soils sequences along an ecological gradient in northern Iran: Implications for palaeoenvironment )

Authors: Ali Shahriari , Farhad Khormali , Alireza Karimi Karouyeh , Maryam Mousavidastenaei , Eva Lehndorff , Martin Kehl ,

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Loess–palaeosol sequences can be evaluated in a number of ways and provide many different kinds of palaeoenvironmental proxy data (Schaetzl & Anderson, 2005). The correlation of soil clay mineralogy with climate conditions has been reviewed in numerous studies and it was suggested that clay mineralogy in soils may follow a weathering pattern, from hot and humid to cool and dry, in the order kaolinite→smectite→vermiculite→chlorite and mixed-layer phyllosilicates→ilite and mica (Sheldon & Tabor, 2009). The northern footslopes of the Alborz Mountains and an extensive hill area in northern Iran are covered by loess deposits divided by different types of interstadial and interglacial palaeosols (e.g., Khormali & Kehl, 2011). We hypothesized that climate has affected on soil formation processes and clay mineralogy. Therefore, changes in clay mineralogical composition were investigated in four loess-palaeosol sequences (Agh Band, Now Deh, Mobarak Abad and Neka sections) located along an ecological gradient for reconstruction of palaeoenvironment. Results of soil texture analysis showed silt particles were dominant particle (more than 50 % percentages) in the loess-palaeosol sequences and modern soils which confirmed aeolian source of loess deposit. Clay content increased from driest part to moist part of studied area while silt content decrease in more strongly developed palaeosol and modern soils horizons which it may reflected weathering processes of clay and/or its translocation and the distance from loess source. The loess-soils sequences contain illite, chlorite, kaolinite and smectite. Smectite, illite-smectite and vermiculite minerals were dominant mineral in more strongly developed modern soils and palaeosol horizons indicating to high precipitation and good vegetation cover (e.g., forest). Clay mineralogy changes and degree of soil development increase from dry to moist conditions reflecting the climate controlled degree of soil formation.

Keywords

, Loess-palaesol sequences, palaeoclimate,
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@inproceedings{paperid:1045160,
author = {Ali Shahriari and Farhad Khormali and Karimi Karouyeh, Alireza and Maryam Mousavidastenaei and Eva Lehndorff and Martin Kehl},
title = {Clay mineralogical changes in loess-soils sequences along an ecological gradient in northern Iran: Implications for palaeoenvironment},
booktitle = {International Symposium on Loess, Soils and Climate Change in Southern Eurasia},
year = {2014},
location = {گرگان, IRAN},
keywords = {Loess-palaesol sequences; palaeoclimate; palaeovegetation},
}

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%0 Conference Proceedings
%T Clay mineralogical changes in loess-soils sequences along an ecological gradient in northern Iran: Implications for palaeoenvironment
%A Ali Shahriari
%A Farhad Khormali
%A Karimi Karouyeh, Alireza
%A Maryam Mousavidastenaei
%A Eva Lehndorff
%A Martin Kehl
%J International Symposium on Loess, Soils and Climate Change in Southern Eurasia
%D 2014

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