Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran

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 p...

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Autores principales:	Moghiseh,E, Heidari,A
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2012
Materias:	polygenetic soils bassanite gypsum halite Petrogypsic Haplosalids Petrosalic Solonchaks
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162012000400008
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spelling	oai:scielo:S0718-951620120004000082013-04-02Polygenetic saline gypsiferous soils of the Bam region, Southeast IranMoghiseh,EHeidari,A polygenetic soils bassanite gypsum halite Petrogypsic Haplosalids Petrosalic Solonchaks 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 physico-chemical 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.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.12 n.4 20122012-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162012000400008en10.4067/S0718-95162012005000028
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	polygenetic soils bassanite gypsum halite Petrogypsic Haplosalids Petrosalic Solonchaks
spellingShingle	polygenetic soils bassanite gypsum halite Petrogypsic Haplosalids Petrosalic Solonchaks Moghiseh,E Heidari,A Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
description	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 physico-chemical 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.
author	Moghiseh,E Heidari,A
author_facet	Moghiseh,E Heidari,A
author_sort	Moghiseh,E
title	Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
title_short	Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
title_full	Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
title_fullStr	Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
title_full_unstemmed	Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
title_sort	polygenetic saline gypsiferous soils of the bam region, southeast iran
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162012000400008
work_keys_str_mv	AT moghisehe polygeneticsalinegypsiferoussoilsofthebamregionsoutheastiran AT heidaria polygeneticsalinegypsiferoussoilsofthebamregionsoutheastiran
_version_	1714206437036523520

Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran

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