Mineralogy assemblage of sand dunes in Khuzestan Province, Iran

Document Type : Research Paper


Soil Science Department, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Khuzestan, I. R. Iran



Sand dunes cover more than half a million hectares of Khuzestan Province in Iran. These areas are a serious threat to agricultural lands, buildings, and industrial facilities. Knowing the characteristics of these lands helps a lot to manage and control this threat. This research was done to determine the characteristics of sand dunes of Khuzestan Province and their management. The results showed that the dynamic characteristics of sand dunes, such as salinity, are different depending on the location and direction of the prevailing wind. However, the organic carbon, cation exchange capacity, and acidity (pH) were similar in all regions. Soluble K was inversely related to salinity. In the western regions, carbonates (lime and dolomite) along with quartz, kaolinite, chlorite, and illite were the dominant minerals, and smectite, palygorskite, and vermiculite were in the next order. The southeastern parts had a similar composition, but the proportion of minerals was different based on the location, especially for polygorskite. The proportion of smectite, polygorskite, and sepiolite minerals was high in the direction of prevailing winds, but their amount decreased in the inner parts. Sepiolite was observed only in the southeastern regions, which was related to the origin of gypsum soils in the neighborhood areas. A similar composition of these minerals and their proportion was also seen in the deeper parts. The similarity of the sand dunes minerals shows that they have the same origin and their similarity with the composition of soil minerals in the plains of Khuzestan indicating that these sands were formed from the wind erosion of the plain during different dry periods.


Article Title [Persian]

ترکیب کانی شناسی تپه های ماسه ای استان خوزستان، ایران

Authors [Persian]

  • سیروس جعفری
  • سمیه حسانی زاده
گروه علوم خاک دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، خوزستان، ج. ا. ایران
Abstract [Persian]

تپه های ماسه بیش از نیم میلیون هکتار از استان خوزستان در ایران را پوشش می دهد. این مناطق تهدیدی جدی برای اراضی کشاورزی، ساختمانها و تأسیسات صنعتی هستند. شناخت ویژگیهای این مناطق کمک زیادی به مدیریت آنها میکند. این تحقیق به منظور تعیین ویژگی های تپه های ماسه ای استان خوزستان و مدیریت آنها انجام شد.  نتایج نشان داد ویژگیهای دینامیک این تپه ها مثل شوری بسته به موقعیت و جهت بادهای غالب متفاوت است. با وحود این، ماده الی، ظرفیت تبادل کاتیونی و پ هاش تقریبا مشابه بودند. پتاسیم محلول با میزان شوری رابطه معکوسی داشت. در نواحی غربی کانی­های کربناتی کلسیت و دولومیت و سیلیکاتی کوارتز، کائولینیت، کلریت، ایلیت غالب و کانی­های اسمکتیت، پالی­گورسکیت و ورمیکولیت در مرتبه بعدی قرار داشتند. بخش­های جنوب شرقی نیز دارای ترکیب کانی‌های مشابهی بودند ولی میزان نسبی این کانی‌ها بخصوص پالی‌گورسکیت تفاوت داشت. کانی ­های اسمکتیت، پالی­گورسکیت و سپیولیت در مبادی ورود بادهای غالب، زیاد و در بخش‌های درونی کمتر بودند. سپیولیت فقط در جنوب شرقی مشاهده شد که به منشاء خاک‌های گچی مناطق مجاور مربوط می‌شد.ترکیب مشابهی از این کانی ها و نسبت آنها در قسمت های عمیق تر نیز دیده شد. تشابه کانی‌های تپه‌های ماسه‌ای نشان می‌دهد که منشأ یکسانی دارند و شباهت آنها با ترکیب کانی‌های خاک در دشت‌های خوزستان نشان می‌دهد که این ماسه‌ها از فرسایش بادی دشت در دوره‌های مختلف خشکی به وجود آمده‌اند. 

Keywords [Persian]

  • پراش پرتو ایکس
  • تپه‌های شنی
  • خشک
  • کانی
  • گرد و غبار
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