IDENTIFICATION OF LOESS DERIVED SOILS AND THEIR DISTINCTION FROM OTHER SOILS IN SOUTHERN MASHHAD

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KARIMI ALI REZA; KHADEMI H.; JALALIAN A.

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Journal: Journal of Water and Soil Science Year:2008 | Volume:12 | Issue:44 Page(s): 185-201

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Title

IDENTIFICATION OF LOESS DERIVED SOILS AND THEIR DISTINCTION FROM OTHER SOILS IN SOUTHERN MASHHAD

Author(s)

KARIMI ALI REZA | KHADEMI H. | JALALIAN A. | Issue Writer Certificate

Keywords

LOESS DERIVED SOILSQ3

RESIDUAL SOILSQ2

SILT-ENRICHED SOILSQ3

LITHOLOGIC DISCONTINUITYQ4

CUMULATIVE PARTICLE SIZE DISTRIBUTION CURVESQ3

Abstract

Despite the existence of highly silty soils in southern Mashhad, there is no information about the aeolian and /or in situ formation of these soils. The main objective of this study was to determine the source of silt generation in this area. Granitic hilly lands in southern Mashhad have been covered by silty deposits. Based on the soil origin, four profiles including a residual soil covered by a silty layer, a residual soil with low amount of silt, a highly silty soil and an alluvial soil as well as a deep profile containing a succession of silty and alluvial materials were studied. Cumulative particle size distribution curve (CPSDC), depth distribution curves of silt/sand ratio (Si/S), Folk inclusive graphic standard deviation, Folk inclusive graphic skewness (SKI) and sand grain morphology analyzed by scanning electron microscopy (SEM) were determined and used to identify the source of the silty materials. Based on the results obtained, silty (L), residual-silty (R-L), residual (R), alluvial (A) and alluvial-silty (A-L) horizons were identified. CPSDC of L horizons is sigmoidal in shape and is easily distinguishable from that of the other horizons. In contrast, the CPSDC of alluvial and residual horizons is spherical in shape. CPSDCs for R-L and A-L horizons are neither sigmoidal nor spherical, but something in between. The L horizons have the highest SKI (very skewed to fine particles) and the lowest Folk inclusive graphic standard deviation (very badly sorted). In this regard, alluvial and residual horizons are intermediate. Because of the silt addition to R-L and A-Lhorizons, these horizons have a nearly zero SKI (symmetrical) and the highest Folk inclusive graphic standard deviation (very badly sorted). Particle size distribution histograms of RL and A-L horizons are bimodal, a mode for sand and a mode for silt, suggesting two different sources. Depth distribution of Si/S, SKI and Folk inclusive graphic standard deviation of highly silty and other horizonz show a drastic change between L horizons and the other horizons-an indication of LITHOLOGIC DISCONTINUITY and difference in origin. In conclusion, despite the possible contribution of granitic parent rocks to silt generation in the area, loess deposits recognized appear to have mostly been transported by aeolian movement.

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APA: Copy

KARIMI, ALI REZA, KHADEMI, H., & JALALIAN, A.. (2008). IDENTIFICATION OF LOESS DERIVED SOILS AND THEIR DISTINCTION FROM OTHER SOILS IN SOUTHERN MASHHAD. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), 12(44), 185-201. SID. https://sid.ir/paper/14916/en

Vancouver: Copy

KARIMI ALI REZA, KHADEMI H., JALALIAN A.. IDENTIFICATION OF LOESS DERIVED SOILS AND THEIR DISTINCTION FROM OTHER SOILS IN SOUTHERN MASHHAD. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES)[Internet]. 2008;12(44):185-201. Available from: https://sid.ir/paper/14916/en

IEEE: Copy

ALI REZA KARIMI, H. KHADEMI, and A. JALALIAN, “IDENTIFICATION OF LOESS DERIVED SOILS AND THEIR DISTINCTION FROM OTHER SOILS IN SOUTHERN MASHHAD,” WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), vol. 12, no. 44, pp. 185–201, 2008, [Online]. Available: https://sid.ir/paper/14916/en

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