INVESTIGATION ON MICROMORPHOLOGICAL PROPERTIES OF A LOESS-PALEOSOL SEQUENCE IN NAHARKHORAN, GORGAN

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GHAZANCHAEI R.; PASHAEI AVAL A.; KHORMALI F.; AYOUBI SH.A.

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Journal: Journal of Agricultural Sciences and Natural Resources Year:2008 | Volume:15 | Issue:2 Page(s): 58-66

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Title

INVESTIGATION ON MICROMORPHOLOGICAL PROPERTIES OF A LOESS-PALEOSOL SEQUENCE IN NAHARKHORAN, GORGAN

Author(s)

GHAZANCHAEI R. | PASHAEI AVAL A. | KHORMALI F. | AYOUBI SH.A. | Issue Writer Certificate

Keywords

SOIL MICROMORPHOLOGYQ2

LOESS-PALEOSOLQ3

PALEOENVIRONMENTQ2

POLYGENETIC SOILSQ2

Abstract

Micromorphological properties of a LOESS-PALEOSOL sequence in Naharkhoran area, south of Gorgan were studied in order to assess the PALEOENVIRONMENTal conditions of the area. Seventeen soil successions were observed across Naharkhoran loess sequence and their morphological properties were described. The undisturbed samples for the preparation of thin sections were collected. The micromorphological observations revealed many evidences on the occurrence of pedogenic processes. The existence of hypocoatings and nodules of Fe and Mn oxides indicates that the studied sequence had periodic fluctuations of redox conditions. Other characteristics of this succession are evidences of biological activity such as faunal excrements, root residues in channels and bioturbation evidences as granular microstructure. The presence of gastropoda shells, possibly points to the dominance of drycool climatic conditions during loess accumulation. Biogenic calcite of cytomorphic and needleshaped types in paleosols is other indicators for favorable climatic conditions and the consequent decay of organic matter. Clay coating and hypocoating are present only in paleosols, which is the evidence for adequate rainfall and moist climatic conditions, enough for leaching and translocation of clay. The presence of compound pedofeaturs such as clay and carbonate and Fe and Mn oxides as juxtaposed and superimposed coatings or hypocoatings in paleosols, probably show that these soils are polygenetic. As a conclusion, Naharkhoran LOESS-PALEOSOL sequence is an indicator for periodic drycool and moist-warm conditions. The loess layers are representative of dry-cool climate, whereas the paleosols are indicators of the moist-warm conditions. Formation of the studied loess and paleosols, have probably taken place in glacial and interglacial cycles with different climatic conditions, respectively.

Cites

PALEOSOLS OF DEVONIAN PADEHA FORMATION IN THE ESTERN-ALBORZ ZONE, NE IRAN: TEXTURAL, MINERALOGICAL AND GEOCHEMICAL CHARACTERISTICS

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APA: Copy

GHAZANCHAEI, R., PASHAEI AVAL, A., KHORMALI, F., & AYOUBI, SH.A.. (2008). INVESTIGATION ON MICROMORPHOLOGICAL PROPERTIES OF A LOESS-PALEOSOL SEQUENCE IN NAHARKHORAN, GORGAN. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, 15(2), 58-66. SID. https://sid.ir/paper/9656/en

Vancouver: Copy

GHAZANCHAEI R., PASHAEI AVAL A., KHORMALI F., AYOUBI SH.A.. INVESTIGATION ON MICROMORPHOLOGICAL PROPERTIES OF A LOESS-PALEOSOL SEQUENCE IN NAHARKHORAN, GORGAN. JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES[Internet]. 2008;15(2):58-66. Available from: https://sid.ir/paper/9656/en

IEEE: Copy

R. GHAZANCHAEI, A. PASHAEI AVAL, F. KHORMALI, and SH.A. AYOUBI, “INVESTIGATION ON MICROMORPHOLOGICAL PROPERTIES OF A LOESS-PALEOSOL SEQUENCE IN NAHARKHORAN, GORGAN,” JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES, vol. 15, no. 2, pp. 58–66, 2008, [Online]. Available: https://sid.ir/paper/9656/en

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