بررسی سازوکار شکل‌گیری نانوذرات طلا در ساختار بلوری آرسنین‌پیریت‌‌های کانسار زرشوران با استفاده از فناوری‌های الکترونی پیشرفته

نوع مقاله : مقاله پژوهشی

نویسنده

دانشگاه بوعلی سینا

چکیده

ویژگی قابل توجهی که ذخایر طلای افشان با سنگ میزبان رسوبی (از جمله  نوع کارلین) را از سایر ذخایر طلا متمایز می­کند، حضور نانوذرات نامرئی طلا به­ویژه در ترکیب کانه­های Fe-As-S چون ­آرسنین­پیریت است. در این پژوهش، به­طور مشخص از باریکه یون متمرکز همراه فناوری­ میکروسکوپ الکترونی روبشی (FIB-SEM) و میکروسکوپ الکترونی عبوری با قدرت تفکیک بالا (HR-TEM) برای واکاوی چگونگی توزیع نانوذرات نامرئی طلا در کانسار زرشوران (شمال تکاب) استفاده شد. این واکاوی الکترونی به­طور مشخص برای آرسنین­پیریت­های طلادار (Py4) این کانسار با بافت گل کلمی و متوسط طلا ppm 21 و آرسنیک 4/2 درصدوزنی انجام شد. براساس نتایج به­دست آمده، فعالیت­های ماگمایی-گرمابی پس از شکل­گیری کانسنگ رسوبی زرشوران منجربه بازتبلور آرسنین­پیریت­های طلادار و در نتیجه باز توزیع عناصر کمیاب و به­ویژه شکل­گیری نانوذرات طلا در ریزشکستگی­های ترمیم­شده بلور شده است. تصاویر میدان تاریک حلقوی با زاویه بالا (HAADF) نشان می­دهند که یون­های طلای موجود در سیال گرمابی تحت اشباع از طلا، ناشی از اثر بازپخت حرارتی (Annealing heating) به­تدریج نانوذرات طلا (کوچکتر از 100 نانومتر) را در نانوحفره­ها و گسیختگی­های انباشتی بلور آرسنین­پیریت جای داده­اند و رخداد این چرخه مداوم موجب شکل­گیری کانسار زرشوران با مقیاس جهانی شده است.       

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the formation mechanism of gold nanoparticles in arsenian pyrite crystal structure of the Zarshuran deposit by advanced electronic technologies

نویسنده [English]

  • Ebrahim Tale Fazel
چکیده [English]

A significant characteristic distinguishing sediment-hosted disseminated gold deposits (i.e. Carlin-style) from other Au deposits is the abundance of invisible Au-nanoparticles in the Fe-As-S ores (e.g., arsenian pyrite). In this study, we used the focused ion beam combined with scanning electron microscope (FIB-SEM) techniques, and a high-resolution transmission electron microscope (HR-TEM) to examine invisible Au and how it evolved through later geologic events that eventually led to the formation of Zarshuran gold deposit. This electron examination was performed on auriferous arsenian pyrite (Py4) of Zarshuran deposit with colloform texture and average content of Au (21 ppm) and As (2.4 wt%). Results concluded that the post-ore magmatic-hydrothermal events after configuration of main orebody of the Zarshuran initiated the annealing of the ionic Au-bearing arsenian pyrite, leading to the redistribution of trace elements and specially formation of Au-bearing nanoparticles. High-angle annular dark field (HAADF) images show gold ions present in a undersaturated hydrothermal fluid, resulting in a gradual annealing process of gold nanoparticles (<100 nm in size) in the nanopores and stacking faults of arsenian pyrite crystals, which have taken place and the occurrence of this continuous cycle has led to the formation of Zarshuran world-class ore deposit.
 

کلیدواژه‌ها [English]

  • Arsenian pyrite
  • gold nanoparticles
  • annealing process
  • Zarshuran deposit

مراجع

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  • تاریخ دریافت: 14 اسفند 1400
  • تاریخ بازنگری: 27 فروردین 1401
  • تاریخ پذیرش: 20 اردیبهشت 1401

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