بررسی ویژگی‌های طیفی و شیمیایی کانی کلریت در مناطق دگرسانی کانسار سولفید توده‌ای ونکان، شمال‌شرق سمنان

نوع مقاله : پژوهشی

نویسندگان

1 دانشکده مهندسی معدن، نفت و زمین فیزیک، دانشگاه صنعتی شاهرود، شاهرود، ایران

2 موسسه زمین شناسی کانسارها، سنگ نگاری، کانی شناسی و زمین شیمی(IGEM)، انجمن علوم روسیه، مسکو 109017، روسیه

3 دانشکده علوم زمین، گروه پترولوژی و زمین‌شناسی اقتصادی، دانشگاه صنعتی شاهرود، شاهرود، ایران

4 UNESCO-UNISA نهاد آفریقا در مدرسه‌عالی تحصیلات تکمیلی علوم نانو و نانوفناوری، دانشگاه آفریقای‌جنوبی، پرتوریا 392، آفریقای-جنوبی

10.22128/ijcm.2025.3001.0

چکیده

کانسار سولفید توده‌ای (VMS) آتشفشان‌زاد ونکان، در حدود ۲۳ کیلومتری شمال‌شرق سمنان واقع شده است. ویژگی‌های طیفی و شیمیایی کانی کلریت در مناطق دگرسانی مرکزی و کناره­ای با هدف ارزیابی پارامترهایی چون اندازه بلورک و نسبت Fe/(Fe+Mg) با روش­های پراش پرتو ایکس (XRD)، طیف‌سنجی پراکندگی انرژی پرتو ایکس (EDX) و میکروسکوپی بررسی شدند. نتایج این پژوهش نشان داد که کلریت‌های مناطق مرکزی دارای میانگین نسبت Fe/(Fe+Mg) برابر با 56/0 و میانگین اندازه بلورک 17/25 نانومتر هستند؛ در حالی‌که نمونه‌های مناطق کناره­ای نسبت بالاتر Fe/(Fe+Mg) برابر با 63/0، اندازه بلورک بزرگ‌تری با میانگین 5/28 نانومتر را نشان دادند. همچنین، مقادیر بالای Zn و Mn در برخی نمونه‌های نواحی مرکزی به ‌عنوان شاخص‌های زمین­شیمیایی نزدیکی به مرکز کانی‌سازی تأیید شدند. یافته‌های این پژوهش نشان می‌دهد که ویژگی­های طیفی و شیمیایی کلریت می‌تواند ابزاری مؤثر برای جهت‌یابی دگرسانی و پی جویی سامانه‌های VMS پنهان باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Spectral and Geochemical Characteristics of Chlorite in the Alteration Zones of the Vanakan Volcanogenic Massive Sulfide Deposit, Northeastern Semnan

نویسندگان [English]

  • maryam shakoui 1
  • Arezo Abedi 1
  • Eliya Viknetef 2
  • Fardin Mosivand 3
  • Mohammad mehdi Shahidi 4
1 Faculty of Mining, Petroleum, and Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran
2 Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Moscow 109017, Russia
3 Faculty of Earth Sciences, Department of Petrology and Economic Geology, Shahrood University of Technology, Shahrood, Iran
4 UNESCO-UNISA Africa Chair in Nanosciences and Nanotechnology, University of South Africa, Pretoria 392, South Africa
چکیده [English]

The Vanakan volcanogenic Massive Sulfide (VMS) deposit is located approximately 23 kilometers northeast of Semnan. The spectral and chemical characteristics of chlorite in the central and marginal alteration zones were investigated to evaluate parameters such as crystallite size and the Fe/(Fe+Mg) ratio using X-ray Diffraction (XRD), Energy-Dispersive X-ray Spectroscopy (EDS), and Microscopic Observations. The results of this study showed that chlorites from the proximal zone had an average Fe/(Fe+Mg) ratio of 0.56 and an average crystallite size of 25.17 nm, whereas chlorites from the distal zone exhibited a higher Fe/(Fe+Mg) ratio of 0.63 and larger crystallite sizes averaging 28.5 nm. Additionally, elevated concentrations of Zn and Mn in some proximal samples were confirmed as geochemical indicators of proximity to mineralization centers. The findings of this study indicate that the spectral and chemical characteristics of chlorite can serve as an effective tool for vectoring alteration and exploring hidden VMS systems.

 

کلیدواژه‌ها [English]

  • Chlorite
  • Crystallite Size
  • X-ray Diffraction (XRD)
  • Vanakan
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