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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/10115

Title: Pedo-Chemical Studies on Saline Playas in the Arabian Shelf
Authors: M. S. AI-Sewailem
A.S. AI-Mashhady
A. A. AI-Sheikh
A. S. Sheta
A. Sh. Sallam
Issue Date: 1998
Publisher: Agricu/tural Sciences, Sultan Qaboos University
Abstract: This research was undenaken [0 srudy the pedo-chemical characteristics of selected playas (sahkhahs) in the Arabian Shelf. Results indicated that most of the sabkhahs are tlat to almost tlat having salt crusts with variahle thickness. Profiles representing the sabkhah surface are extremely saline compared with that of the surrounding la!ldscapes. The dominant soluble salts are cr and SO/- of Na <- followed by Ca!<- or Mgz<-. The compositions of the coastal sabkhahs profile layers are closely related to the Gulf water composition while the inland playas are more associated with local conditions. This was confirmed from the similarity in salt levels. ion molar ratios and relatively high correlation coefficients between the electrical conductivity of soluble salts (EC,) and either soluble B.I<- (r=0.80) or soluhle Mgz+ (r!=0.60) in coastal compared with that of the inland sabkhahs (r! =0.17) and (r! =0.37), respectively. The main pedological process affecting the formation of coastal sabkhahs is the upward movement of the water table which is rich in salts originating from the Gulf waters either directly or throl,lgh wind action. Leaching, accumulation of sediments and evaporative concentrations of the solutes are the processes prevailing in the inland sabkhahs. Salt crusts are dominated by cr amI SO}+ of Na+, Mi+ and CaH salts while K+salts are relatively low. X-ray diffraction patterns confirm the presencl': of halite. gypsum and carbonate minerals. Epsomite and bloedite minerals were identified in both coastal and inland sabkhahs. Specitic minerals and relative abundance was quite variable between the salt crusts due to the characteristic conditions of each sabkhah. The major differences between the inland and coastal sabkhahs are related to the source. composition and depth of the water table .and consequently the composition and mineralogy of the surface salt crusts.
URI: http://hdl.handle.net/123456789/10115
Appears in Collections:College of Foods And Agricultural Science

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