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نمایش تعداد 1-10 از 30

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    Grain size parameters of aeolian deposits in Sarakhas area, Norteastern Iran 

    نوع: Conference Paper
    نویسنده : علیرضا کریمی; علی سودمند; Farhad Khormali; Alireza Karimi; ali soodmand
    سال: 2014
    خلاصه:

    of deposition and determining the provenance of aeolian deposits (Zhu et al., 2014).Loess and sand dunes are the two main aeolian deposits that are different regarding to their grain size distribution. Sand dunes occur in all climate conditions, but active sand...

    Magnetic susceptibility and free iron oxides (Fed) of a loesspaleosol section at Southweastern Sari (Northern Iran) 

    نوع: Conference Paper
    نویسنده : حامد نجفی کرسامی; علیرضا کریمی; Farhad Khormali; غلامحسین حق نیا; Shamsollah Ayoubi; Hossein Tazikeh; Hamed najafi; Alireza Karimi; Gholam Hosain Haghnia
    سال: 2017
    خلاصه:

    >
    and Fed variations in loess-paleosol sequence section ate Southweastern Sari in

    northern Iran....

    Distribution, lithology and provenance of peridesert loess deposits in northeastern Iran 

    نوع: Journal Paper
    نویسنده : علیرضا کریمی; Hossein Khademi; Martin Kehl; Ahmad Jalalian; Alireza Karimi
    سال: 2009
    خلاصه:

    as loess. They show a particle size distribution similar to that of typical loess deposits, containing more than 70% silt, mostly coarse silt (35–45%) and low quantities of clay and sand. Bulbous edges and evidence of wind transportation on quartz grains...

    Chronostratigraphy of loess deposits in northeast Iran 

    نوع: Journal Paper
    نویسنده : علیرضا کریمی; M. frechen; H. Khademi; M. Kehl; A. Jalalian; Alireza Karimi
    سال: 2011
    خلاصه:

    Little information is available on the paleoclimate evolution of northeast Iran relating to global cold and

    warm stages. The loess/paleosol sequences from southern Mashhad and Kalat-e Naderi areas were

    studied to determine...

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

    نوع: Conference Paper
    نویسنده : Ali Shahriari; Farhad Khormali; علیرضا کریمی; Maryam Mousavidastenaei; Eva Lehndorff; Martin Kehl; Alireza Karimi
    سال: 2014
    خلاصه:

    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...

    climate change in Northeast Iran based on the morphology of palygorskite and pedogenic carbonates in loess deposits 

    نوع: Conference Paper
    نویسنده : علیرضا کریمی; Hossein Khademi; Ahmad Jalalian; Alireza Karimi
    سال: 2008
    خلاصه:

    climate change in Northeast Iran based on the morphology of palygorskite and pedogenic carbonates in loess deposits...

    Stable isotope geochemistry of pedogenic carbonates in loess-derived soils of northeastern Iran: Paleoenvironmental implications and correlation across Eurasia 

    نوع: Journal Paper
    نویسنده : Omid Bayat; علیرضا کریمی; Hossein Khademi; Alireza Karimi
    سال: 2016
    خلاصه:

    Despite the occurrence of pedogenic carbonates in loess/paleosol sequences of northern and northeastern Iran, there is no information about stable isotope geochemistry of pedogenic carbonates in these regions. This paper presents thefirst stable...

    Engineering Geology Criteria for Evaluation and Classification of Loess in Golestan Province 

    نوع: Journal Paper
    نویسنده : حامد رضایی; غلامرضا لشکری پور; محمد غفوری; hamed rezaiy; Gholam Reza Lashkaripour; Mohammad Ghafoori
    سال: 2011
    خلاصه:

    What discriminates loess from other soil types is lack of stratification, as well as uniformity of

    their particles, which makes them to be easily identified in field. An area of approximately

    388,000 hectares of Golestan province...

    Discrimination of sand dunes and loess deposits using grain-size analysis in northeastern Iran 

    نوع: Journal Paper
    نویسنده : علیرضا کریمی; Farhad Khormali; Xin Wang; Alireza Karimi
    سال: 2017
    خلاصه:

    Identification and characterization of aeolian deposits in arid environments provide information on mechanisms of loess and sand accumulation. The objectives of this study were to (i) identify the distribution of aeolian deposits...

    Effect of slope aspects on variation of soil organic carbon in a loess hillslope of Toshan area, Golestan Province,Iran 

    نوع: Conference Paper
    نویسنده : S.Maleki; F.Khormali; F.Kiani; علیرضا کریمی; Alireza Karimi
    سال: 2012
    خلاصه:

    . The aim of this study is to characterize spatial patterns of the concentrations of topsoil SOC on different slope aspects in a loess hillslope of Toshan area in Golestan Province, Northen Iran. Therefore, 96 soil samples were collected at three aspects...

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