بررسی فاکتورهای کنترل کننده توزیع عناصر جزئی (شامل عناصر نادر خاکی) در طی فرایندهای بوکسیتی شدن در کانی‌شیته، خاور بوکان، شمال باختر ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشکده علوم، دانشگاه ارومیه، ارومیه، ایران

2 گروه زمین شناسی، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

چکیده

نهشته بوکسیت کارستی کانی شیته، در 19 کیلومتری خاور بوکان، در جنوب استان آذربایجان شرقی، شمال­باختر ایران واقع شده است. این افق در مرز بین سازندهای کربناتی- شیلی روته (پرمین میانی تا بالایی) و کربناتی الیکا (تریاس زیرین) قرار داشته و شامل  5 واحد سنگی جدا از هم است. شواهد صحرایی، مطالعات سنگ‌نگاری و کانی‌شناسی نشان داده­اند که نوسانات شرایط آب و هوایی به همراه تنش­های ســاختـاری تأثیر بسزایی در تشکیل این افق داشته­اند. الگوی توزیـع REEها (بهنجار شده به کندریت)، تفریق و غنی‌شدگی شدید LREEها نسبت به HREEها و نحوه تشکیل برجازای افق را نشان می­دهند. محاسبات شاخص هوازدگی مطلق،  فرض Nb به عنوان عنصر بی­تحرک و پوسته قاره­ای بالایی به عنوان منشأ برای مواد مادر، نشان می‌دهند که فرایندهای شستشو و تثبیت، دو تنظیم کننده­ اصلی در تمرکز عناصر جزئی در این افق هستند. مطالعات ژئوشیمیایی نشان می‌دهند که توزیع Al، Fe و Si  تأثیر زیادی در تغییرات نسبت La/Y،  توزیع عناصر جزئی در سیستم بازماندی و ناهنجاری Eu داشته­اند. تلفیق نتایج به‌دست آمده نشان داده که تغییرات بافتی، جذب ترجیحی به‌وسیله اکسیدهای فلزی (هماتیت)، بافرینگ محلول‌های هوازده کننده توسط سنگ  بستر کربناتی، کنترل کانی‌شناختی و تغییر pH محیط، مهم­ترین  عامل‌های کنترل کننده در توزیع  LREE، HREE، HFSE، LILE و TTE، طی فرایندهای لاتریتی شدن در کانی­شیته هستند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation on Controlling Factors of the Distribution of Trace-Elements (including REE) during Bauxitization Processes at Kanisheeteh,East of Bukan, NW Iran

نویسندگان [English]

  • A. Abedini 1
  • A. A. Calagari 2
1 Geology Department, Faculty of Sciences, Urmia University, Urmia, Iran
2 Geology Department, Faculty of Natural Sciences, Tabriz University, Tabriz, Iran
چکیده [English]

Karstic bauxite horizon at Kanisheeteh is located ~19km east of Bukan, south of West-Azarbaidjan province, NW of Iran. This horizon lies conformably along the boundary of Ruteh (carbonate-shale) formation (middle to upper Permian) and Elika (carbonate) formation (lower Triassic), and consists of five distinct lithic units. Field evidence, petrographical and mineralogical examinations showed that fluctuations of climatic conditions along with structural stresses had a great influence in the formation of this horizon. Distribution pattern of REE (normalized to chondrite) indicates an intensive fractionation and enrichment of LREE over HREE, and an authigenic formation for the horizon.  Calculations of absolute weathering index (AWI) and assumption of Nb as an immobile element and the upper continental crust (UCC) as a source for parent materials show that leaching and fixation processes are the two major regulators in concentrating of trace-elements in this horizon. Geochemical investigations indicate that distribution of Al, Fe, Si had great influence in changes of La/Y ratio, distribution of trace-elements in residual system, and Eu anomaly. Incorporation of the obtained results revealed that textural variations, preferential adsorption by metallic oxides (hematite), buffering of weathering solutions by carbonate bedrock, mineralogical control, and pH changes of the environment are the most important controlling factors in the distribution of LREE, HREE, HFSE, LILE and TTE during lateritization processes at Kanisheeteh.

کلیدواژه‌ها [English]

  • Karstic bauxite
  • Absolute weathering index
  • Trace-elements
  • Kanisheeteh
  • Bukan

 افتخارنژاد، ج.، 1973-  نقشه زمین‌شناسی مهاباد به مقیاس 1:250000. انتشارات سازمان زمین‌شناسی و اکتشافات معدنی کشور.

 حسامی، ع.، 1370- بررسی های اکتشافی بوکسیت های شرق بوکان. رساله کارشناسی ارشد، دانشگاه تهران، 285ص.

 

 

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