Biogeochemical exploration in Sari Gunay gold deposit, Northwestern Iran

Document Type: Research Paper

Authors

1 Department of Geochemistry, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran

2 Department of Plant Sciences, Faculty of Biologi cal Sciences, Kharazmi University, Tehran, Iran

Abstract

Biogeochemistry is a useful tool for assessing geochemical dispersion patterns. Sari Gunay epithermal gold deposit was selected in order to assess the application of biogeochemical exploration for gold in northwestern Iran. In this study, four sites were sampled in a profile perpendicular to mineralized vein with a control site two km far-off mineralized vein. A sample from each dominant plant species (Silene conoidea, Achillea aleppica, Crepis corniculata, Centaurea virgata) was collected in each site and after preparation, analyzed using ICP-MS method. The results show that there is an inverse relationship between distance from mineralized vein and the concentration of gold and its associated elements in S. conoidea and A. aleppica species. S. conoidea has higher concentration of gold (303 ppb) than other species, therefore this species is a preferable bioindicator for gold mineralization. Biological absorption coefficients for Au and its pathfinder among all three species are increased over Au mineralization vein and decrease in following order S. conoidea> A. aleppica> C. corniculata. There is a need for further investigation on using S. conoidea as an As-phytoextractor (As=163.5 ppm) in remediation for arsenic contaminated sites, which also might be helpful during mining and mineral processing in Sari Gunay and neighboring deposits.

Keywords


Article Title [Persian]

اکتشافات بیوژئوشیمیایی در محدوده کانسار طلای ساری گونی، شمالغرب ایران

Authors [Persian]

  • بهزاد مهرابی 1
  • حسن علیمحمدی 1
  • مهین فرهادیان بابادی 1
  • فرخ قهرمانی نژاد 2
1 دانشکده علوم زمین دانشگاه خوارزمی
2 دانشگاه خوارزمی
Abstract [Persian]

بیوژئوشیمی یکی از روش های کاربردی برای ارزیابی پراکنش ژئوشیمیایی عناصر و بازسازی محیط زیست در نواحی آلوده است. در این پژوهش کاربرد اکتشافات بیوژئوشیمیایی در اکتشاف طلا در محدوده کانسار طلای ساری گونی در شمال غرب ایران مورد بررسی قرار گرفته است. به همین منظور در چهار محدوده در نیمرخی عمود بر کانی سازی شناخته شده (رگه گرمابی کوارتز-پیریت-استیبنیت-اورپیمنت) به همراه دو نمونه کنترلی در فاصله دو کیلومتری محدوده ها نمونه برداری از گیاهان انجام شد. یک نمونه از گونه های گیاهی غالب (S. conoidae, A. aleppica, C. corniculata, C. virgata) در هر محدوده برداشت و پس از آماده سازی به روش ICP-MS تجزیه شد. نتایج بررسیها نشان می دهد که غلظت طلا و عناصر همراه با فاصله گرفتن از رگه ها در گونه های S. conoidae و A. aleppica رابطه معکوس دارد. گونه S. conoidae دارای بیشترین مقدار غلظت طلا (303 میلی گرم در تن) است و گیاه نشانگر برای اکتشافات طلا در منطقه محسوب می شود. ضریب جذب زیستی طلا و عناصر ردیاب آن در سه گونه مورد بررسی در محدوده طلادار بیشترین مقدار را در مجاورت رگه معدنی نشان می دهد و دارای روند کاهشی S. conoidae> A. aleppica> C corniculata است. علاوه بر آن نیاز به انجام مطالعات بیشتر در مورد گونه S. conoidae بعنوان گونه بیش انباشتگر (ارسنیک با غلظت 5/163 میلی گرم در تن) وجود دارد زیرا در طی بهره برداری می توان از این گونه برای بازسازی مناطق آلوده در محدوده ساری گونی استفاده کرد.

Keywords [Persian]

  • اکتشافات بیوژئوشیمیایی
  • طلا
  • گونه های گیاهی نشانگر
  • ساری گونی
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