یافته‌های نوین زمین‌شناسی کاربردی

یافته‌های نوین زمین‌شناسی کاربردی

بررسی سازوکار رشد همبافتی در آرسنین ­پیریت ­­های طلادار کانسار یگانلی-2 (شمال تکاب): بینشی نوین از تعامل پیچیده سینتیک رشد بلور و تمرکز طلا

نویسنده
دانشیار گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه بوعلی‌سینا، همدان، ایران
چکیده
درک تعامل پیچیده میان توزیع عناصر کمیاب گرانبها (طلا، نقره و پلاتین) و سینتیک رشد بلور در زمین­شناسی اقتصادی از اهمیت بالایی برخوردار است. در این پژوهش عوامل موثر بر مشارکت عناصر کمیاب، به­ویژه طلا، طی رشد همبافتی بلور آرسنین­پیریت به­طور موردی در کانسار طلای یگانلی-2 (شمال­ تکاب) توسط فناوری­های الکترونی- اتمی مورد واکاوی قرار گرفته است. طبق شواهد میکروسکوپ الکترونی روبشی (SEM)، باندهای روشن غنی از آرسنیک (بیش از 3 گرم در تن) با ضخامت 10 نانومتر حاوی عناصر کمیاب ناهمگن دیگر (نظیر عناصر Cu، Sb، Pb و Tl) هستند. بر اساس مطالعات توموگرافی کاوشگر اتمی (APT)، توزیع این عناصر ناهمگن در باندهای روشن غنی از آرسنیک به شکل جزیره­ای، سازگار با الگوی رشد Stranski-Krastanov می­باشد که با فاصله از این باندها، رشد همبافتی در نتیجه پالس­های متناوب و کوتاه سیال گرمابی توسعه یافته است. طبق مطالعات، ایجاد آشفتگی شبکه بلوری آرسنین­پیریت ناشی از تمرکز آرسنیک، منجربه افزایش جذب سطحی فلزات کمیاب و ظهور ناخالصی‌های "بدون ساختار" به­ویژه در نقص­های بلوری شده است. در مجموع، طبق شواهد بافتی- شیمیایی در مقیاس نانومتر از یک بلور آرسنین­پیریت می­توان گفت سینتیک رشد بلور و تعامل پیچیده آن با سیال گرمابی در حال تعادل، نقش مهمی در توزیع و تمرکز طلا دارد که می­تواند به­عنوان یک رهیافت اکتشافی در مقیاس کانی­شناسی مورد توجه قرار گیرد.
کلیدواژه‌ها

عنوان مقاله English

Epitaxial growth mechanism of the Au-bearing arsenian pyrites in Yeganli-2 gold deposit, north of Takab: New insight from complex interaction of crystal growth kinetics and gold concentration

نویسنده English

E. Tale Fazel
Assoc. Prof., Dept., of Geology, Faculty of Science, Bu Ali Sina University, Hamedan, Iran
چکیده English

Understanding the complex interplay between the crystallization processes and distribution of precious trace elements (e.g., gold) is of great importance in economic geology. In this contribution, the effective factors on the incorporation of trace elements, especially gold, during the epitaxial growth of Au-bearing arsenian pyrite crystal in the Yeganli gold deposit (north of Takab) have been interpreted by advanced electron-atomic techniques. According to SEM evidence, As-rich (> 3 ppm) bright bands with a thickness of 10 nm have other trace elements (e.g., Cu, Sb, Pb, and Tl). According to the evidence of APT, the heterogeneous distribution of trace elements with the appearance of islands along the discontinuous planar features from the outer edge of the As-rich bright bands is known as Stranski-Krastanov growth mode, and with the distance from these bands, epitaxial growth occurs as a result of periodic fluid fluctuations. Also, As-induced lattice distor­tion facilitates surface adsorption of dopant trace metals, which leads to “unstructured” impurities clustering lo­cally in crystal defects. In summary, based on nano-scale textural-chemical evidence from arsenitepyrite crystals, it can be said that the kinetics of crystal growth and its complex interaction with the equilibrating hydrothermal fluid play an important role in the distribution and concentration of gold, which can be considered as a prospecting implication at the mineralogical scale.

کلیدواژه‌ها English

Arsenian pyrite
Precious elements
Atom probe tomography
Epitaxial growth
Yeganli-2 deposit
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  • تاریخ دریافت 28 خرداد 1404
  • تاریخ بازنگری 22 مرداد 1404
  • تاریخ پذیرش 22 شهریور 1404