Mode of gypsum deposition in southeastern Iranian soils as revealed by isotopic composition of crystallization water

Farpoor, Mohammad Hady; Khademi, Hossein; Eghbal, Mostafa Karimian; Krouse, H. R.

doi:10.1016/j.geoderma.2003.11.013

Cited by 31 publications

(18 citation statements)

References 21 publications

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“…Looking at sulfur isotope geochemistry of gypsiferous Aridisols from Isfahan region, central Iran, Khademi et al (1997a) found that lower Cretaceous sea sulfate was the source of sulfur in that area. The mode of gypsum deposition in the Rafsanjan area, southeastern Iran studied by Farpoor et al (2004) showed that gypsum has formed from the evaporation of SO 4 -rich solution, similar to the conclusion made by Khademi et al (1997b) for the Isfahan region of Iran.…”

Section: Introductionsupporting

confidence: 75%

“…Farpoor et al (2004) also came to the same conclusion in the Rafsanjan area, Iran. This confirms that the Loot Desert has also experienced the same geological history of central Iran.…”

Section: Stable Isotope Geochemistrysupporting

confidence: 62%

“…Looking at the different probable mechanisms of gypsum formation mentioned above, Khademi et al (1997b) and Farpoor et al (2004) found that evaporation from solutions saturated with SO4 − 2 was the major mechanism for gypsum accumulation in the soils of Isfahan and Rafsanjan (southeastern part of central Iran) regions. The area studied in this research is very close to Rafsanjan region (200 km), and the same trend in gypsum formation is expected, but the δD and δ 18 O values in Loot Desert are much lighter (Table 3) than the values reported for Isfahan and Rafsanjan regions.…”

Section: Stable Isotope Geochemistrymentioning

confidence: 99%

See 2 more Smart Citations

Stable isotope geochemistry of sulfur bearing minerals and clay mineralogy of some soils and sediments in Loot Desert, central Iran

Farpoor

Krouse

2008

Geoderma

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Section: Introductionsupporting

confidence: 75%

“…Farpoor et al (2004) also came to the same conclusion in the Rafsanjan area, Iran. This confirms that the Loot Desert has also experienced the same geological history of central Iran.…”

Section: Stable Isotope Geochemistrysupporting

confidence: 62%

Section: Stable Isotope Geochemistrymentioning

confidence: 99%

See 1 more Smart Citation

Stable isotope geochemistry of sulfur bearing minerals and clay mineralogy of some soils and sediments in Loot Desert, central Iran

Farpoor

Krouse

2008

Geoderma

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“…Based on geological and biological evidences, the climate change in Iran is documented (Mahmoudi, 1987;Krinsley, 1970;Khademi, et al 1997, Khademi andMermut, 2003;Farpoor, et al 2004). Most of them believe that during glacial stages climatic conditions were drier and colder than today.…”

Section: Discussionmentioning

confidence: 99%

“…Among the countries in arid and semiarid regions, Iran seems to have the largest area of gypsiferous soils in world, covering about 27 to 28 Mha (Mahmoodi, 1994, Farpoor et al, 2004. Saline soils comprise around 16 to 23 Mha of arable lands in Iran (Siadat et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran

Moghiseh

Heidari

2012

J. Soil Sci. Plant Nutr.

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Gypsiferous and saline soils are among the major soils of arid and semi-arid regions of the world. Although numerous studies on salic, gypsic and petrogypsic horizons have been carried out, the co-occurrence of gypsum and halite and their morphological expression are still poorly documented. Eight pedons located on a co-alluvial fan (Bam area, southeast Iran) were described, sampled and analyzed for physicochemical and micromorphological characteristics based on standard methods. The highest amounts of gypsum (≈ 60 %) comprising xenotopic gypsum and/or fibrous bassanite pseudomorph remaining behind after xenotopic gypsum dehydration were determined in the surface crust and in the underlying 2Byz horizon. At a depth of 15 cm, a horizon cemented by gypsum and halite was observed. The highest amount of gypsum was determined at the upper part of this horizon followed by a sharp decreasing trend towards the lower depth. The amount of halite increases with increasing depth towards the bottom of 3Byzm horizon. Deeper, in the 5Byz horizon the quantity of gypsum increases drastically and coarse elongated gypsum pendants dominate. Micromorphological observations demonstrate that the dominant cementing agent is halite rather than gypsum. However, due to inexistence of petrosalic diagnostic horizon in Keys to Soil Taxonomy, these soils are to be classified as Petrogypsic Haplosalids at subgroup level in Soil Taxonomy. In WRB Taxonomy, they are classified as Petrosalic Solonchaks. Co-occurrence of gypsum and halite in the same horizon, their specific layering and vertical distribution patterns in the studied pedons might be considered as indicators for polygenetic soils in this area.

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