بررسی زمین شناسی،کانی شناسی و چگونگی حضور طلا در بخش اکسایشی معدن مس- طلای شادان، خراسان جنوبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم زمین، دانشکده علوم و فناوری های همگرا، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 دانشگاه لودویگ ماکسیمیلیان، مونیخ،LM-U، آلمان

3 پژوهشکده علوم زمین سازمان زمین شناسی و اکتشافات معدنی کشور، تهران،

4 گروه علوم زمین، دانشکده علوم و فناوری‌های همگرا، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران و موزه معدن آلمان، بوخوم

چکیده

کانسار مس- طلای پورفیری شادان در کرانه شرقی کمربند آتشفشانی- نفوذی ترشیری قطعه لوت قرار دارد. محلول­های ماگمایی- گرمابی برآمده از داربستی گرانیتی- گرانودیوریتی پورفیری که بیشتر در سنگ­های آتشفشانی ائوسن نفوذ کرده­اند باعث رخداد انواع دگرسانی­های فراگیر پتاسیمی، پتاسیمی- فیلیک، آرژیلیک و پروپیلیتیک در منطقه شده­اند. سامانه کانی­زایی در ذخیره شادان به صورت­های پورفیری، فراگرمایی-رگه­ای و برش­های گرمابی کانه­دار رخ داده است. کانی­سازی پورفیری بیشتر بصورت افشان و داربستی در توده گرانودیوریتی و نوع رگه­ای بصورت رگچه­های کوارتز سولفیدی و کربناتی با روند عمومی شمالغرب- جنوبشرق دیده می­شود. کانی­زایی به دو صورت اکسیدی (بیشتر هماتیت، مگنتیت، لیمونیت و گوتیت) و سولفیدی (بیشتر پیریت، کالکوپیریت، بورنیت  و کولیت) قابل شناسایی است. با توجه به شواهد صحرایی، میکروسکوپی و دماسنجی، خاستگاه کانسار مس- طلای شادان در گستره ذخایر پورفیری – فراگرمایی قرار دارد. نتایج تجزیه کانسنگ اولیه نشان می­دهد که عناصر اصلی در کانسنگ مس و طلا هستند. طیف پراکندگی انرژی پرتوی ایکس (EDX) 53 ذره طلا نشان می­دهد که طلای آزاد یا الکتروم در اندازه حدود 1 تا 10 میکرون به سه صورت؛ تکی، بین دانه­ای و به دام افتاده و بیشتر درون کانی­های اکسیدی لیمونیت و هماتیت تشکیل شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Geology, mineralogy and occurrence of gold minerals in oxide part of the Shadan copper-gold mine, Southern Khorasan

نویسندگان [English]

  • parivash mahdavi 1
  • Alireza Jafari-Rad 1
  • Soraya Heuss-Aßbichler 2
  • Mohamad Lotfi 3
  • Nima Nezafati 4
1 Department of Earth Science ,Science and Research Branch, Islamic Azad University, Tehran, Iran.
2 Department of Earth and Environmental Sciences, Ludwig-Maximilians
3 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
4 Department of Earth Sciences, Islamic Azad University, Science and Research Branch, Tehran, Iran and Deutsches Bergbau-Museum, Bochum, Germany
چکیده [English]

The Shadan Porphyry copper-gold ore is located in eastern margin of Tertiary volcano-plutonic belt of the Lut block. Hydrothermal Magmatic solutions of granite-granodiorite stock porphyry rocks that are generally intruded  in the Eocene volcanic rocks resulted  in vast potassic, potassic-phyllic, argillic and propylitic alterations in the area. Mineralization in the Shadan ore has been occurred as porphyry, epithermal-vein and hydrothermal breccia. Mineralization is mostly occurred as scattered, stockworks in granodioritic mass and vein type as sulphide, quartz and carbonate veins, trending northwest-southeast. Mineralization are recognized in two types: oxidized (hematite, magnetite, limonite, goethite)  and sulfide (pyrotite, chalcopyrite ,bornite and covelite). According to microscopic and thermometric studies, genesis of the Shadan copper- gold ore is porphyry-epitermal. The results analysis on the primary ore show that the main metallic minerals in the ore are copper and gold. The EDX spectrum of scanning electron microscopy (SEM) on 53 gold particles shows that gold particles are in the form of native gold and electrum is between 1 and 10 microns in size. The occurrence of gold includes mono gold, trapping gold and intergranular gold. Gold grains are within the limonite, and hematite .

کلیدواژه‌ها [English]

  • mineralogy
  • Oxidized zone
  • Gold
  • copper
  • Shadan
  • Porphyry.Southern Khorasan

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  • تاریخ دریافت: 08 بهمن 1401
  • تاریخ بازنگری: 26 بهمن 1401
  • تاریخ پذیرش: 22 اسفند 1401

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