Geochemistry and origin of elements of Upper Triassic Olang coal deposits in northeastern Iran

Document Type: Research Paper

Authors

1 Assistant Prof. of Economic Geology, School of Earth Sciences, Damghan University

2 MSC of Economic Geology, School of Earth Sciences, Damghan University, Damghan, Iran

Abstract

The Olang area is a part of Gheshlagh-Olang synclinal, which is a member of eastern Alborz coal basin and is situated at a distance of
70 km northeast of Shahroud city. Coal-bearing strata of this region are part of the Shemshak group (Upper Triassic to Lower Jurassic).
Samples from the 9 coal seams of the Olang coal deposits were collected and ashed. The aim of this study is to determine the
occurrence and distribution of major and trace elements in the coal ashes of Upper Triassic Olang coal deposits in northeastern Iran.
The concentration of the elements in the coal ashes of the Olang region is higher than the Clarke value and the average of World coal
ash. The coal ashes have been enriched in Zn, Mn, and P in comparison with the average of the World coal ash. The correlation
coefficient analysis on the major and trace elements in the ash yielded in four groups including: A (Rb, K, Cs, Si), B (Al), C (Tl, Ca,
Nb, Ta, V) and D (Cr, Hf, Sn, Zr, Th, Zn, Ti, Ba, W, Mg, Na, P, Sr, Co, Cu, Mo, Ni, U, Fe, Ca). The first two groups are strongly
correlated with ash yield and mainly have an inorganic affinity. C and D groups are negatively or less strongly correlated with ash
yield. The rare earth elements' abundances are negatively correlated with the ash yield and exhibit an organic affinity. Based on
correlation, cluster analyses, and rare earth elements' distribution characteristics, two separate modes of occurrence can be considered
for rare earth elements: 1) Accompanying phosphate minerals with organic origin (phosphorites) or phosphate organic materials, and 2)
Accompanying the vitrinite maceral group.

Keywords


Article Title [Persian]

ژئوشیمی و منشاء عناصر در معادن زغالسنگ تریاس فوقانی اولنگ، شمال شرق ایران

Authors [Persian]

  • نادر تقی پور 1
  • زهرا سلیمانی مارشک 2
1 عضو هئیت علمی دانشکده علوم زمین، دانشگاه دامغان
Abstract [Persian]

این مطالعه به بررسی مدل رخداد و توزیع عناصر اصلی و فرعی نهشته‌های زغالسنگی منطقه اولنگ با سن تریاس بالایی واقع در شمال شرق ایران می‌پردازد. نمونه‌های زغال‌سنگی از 9 لایه زغال‌سنگی منطقه اولنگ جمع‌آوری و به خاکستر تبدیل شدند. غلظت عناصر در خاکستر زغالسنگ‌های منطقه اولنگ بیشتر از مقدار کلارک و همچنین بیشتر از میانگین خاکستر زغالسنگ‌های جهان می‌باشد. عناصر اصلی و فرعی لایه‌های زغال‌سنگی منطقه اولنگ بر اساس ضرایب همبستگی‌شان با بازده خاکستر در چهار گروه (Rb, K, Cs, Si)A ، (Al)B ، (Tl, Ca, Nb, Ta,V)C و (Cr, Hf, Sn, Zr, Th, Zn, Ti, Ba, W, Mg, Na, P, Sr, Co, Cu, Mo, Ni, U, Fe, Ca)D جای می‌گیرند. دو گروه اول ضریب همبستگی قوی با درصد حاکستر نشان می دهند و عمدتا دارای قرابت غیر آلی می‌باشند.بر اساس آنالیز همبستگی، آنالیز خوشه‌ای و ویژگی‌های توزیع عناصر نادر خاکی دو شکل رخدادی مجزا برای این عناصر می‌توان در نظر گرفت: 1) همراهی این عناصر با کانی‌های فسفاته‌ای چون مونازیت یا مواد آلی فسفاته. 2) همراهی با گروه ماسرالی ویترینیت.

Keywords [Persian]

  • ژئوشیمی
  • زغالسنگ
  • اولنگ
  • ایران
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