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Climatic interpretation of loess-paleosol sequences at Mobarakabad and Aghband, Northern Iran

Published online by Cambridge University Press:  20 January 2017

Amin Ghafarpour ,
Farhad Khormali ,
William Balsam ,
Alireza Karimi  and
Shamsollah Ayoubi
Amin Ghafarpour
Affiliation:
Department of Soil Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Farhad Khormali*
Affiliation:
Department of Soil Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
William Balsam
Affiliation:
Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, USA
Alireza Karimi
Affiliation:
Department of Soil Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
Shamsollah Ayoubi
Affiliation:
Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran, 84156-83111
*
* Hezar Peach Blvd. (Pardis), Dept. of Soil Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. Khormali@yahoo.com, fkhormali@gau.ac.ir (F. Khormali)
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Abstract

Loess accumulation and paleosol formation are important Quaternary geoarchives in northern Iran. Two loess-paleosol sequences at Mobarakabad and Aghband were examined using soil morphology and micromorphology, mineralogy, magnetic susceptibility (MS), free Fe oxides and calcium carbonate equivalent. The loess-paleosol sequences provide a record of changes in paleo-rainfall in the northern Iran. Micromorphological and MS differences between the loess and paleosols in the sections reflect changes in climate. The different behaviors of magnetic susceptibility between Aghband and Mobar-akabad loess are mainly produced by their different pedogenic environments, topography and climatic conditions. As a result, the MS at the Mobarakabad section is much higher than at Aghband. Paleoeco-logical reconstructions coupled with magnetic depletion in paleosols at Mobarakabad suggest a wetter climate dominating during the formation of the paleosols.

Keywords

LoessPaleosolMagnetic susceptibilityMicromorphologyQuaternaryNorthern Iran
Type
Research Article
Information
Quaternary Research , Volume 86 , Issue 1 , July 2016 , pp. 95 - 109
Copyright
Copyright © American Quaternary Association 2016 

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