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کانه زایی، شیمی کانه ها و ایزوتوپ های پایدار گوگرد در اندیس طلای چالداغ (شمال تکاب): شواهدی برای دستیابی به سازوکار تشکیل طلا | ||
زمین شناسی اقتصادی | ||
دوره 13، شماره 1 - شماره پیاپی 28، 1400، صفحه 85-111 اصل مقاله (5.53 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22067/econg.v13i1.83781 | ||
نویسندگان | ||
رؤیا بیگدلی؛ ابراهیم طالع فاضل ![]() ![]() ![]() | ||
گروه زمینشناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران | ||
چکیده | ||
منطقه اکتشافی چالداغ با عیار متوسط 5/4 گرم در تن بهعنوان یکی از اندیس های پرعیار کانسار زرشوران، در شمال تکاب واقعشده است. از لحاظ ساختاری این منطقه در غرب گسل رانده قینرجه و طاقدیس ایمانخان (راستای NW) قرار دارد و واحد کربنات آهندار چالداغ به سن نئوپروتروزوئیک-کامبرین بالایی، سنگ میزبان اصلی کانه زایی است. طبق شواهد ریزکاوالکترونی، طلا بهصورت محلول جامد با کاتیون Au+ و محتوای 10 تا 80 گرم در تن (ppm) در ترکیب کانه آرسنینپیریت با فرمول (Fe2+As3+)S2Au2.S0 تمرکز دارد. شواهد ایزوتوپ پایدار گوگرد بر روی کانه های سولفیدی رالگار و پیریت گویای مقادیر δ34SCDT بین 5/3 تا ‰ 5/6 (متوسط ‰ 5 در تعداد 6 نمونه)، است. با توجه به مقادیر FeS mol% اسفالریت، تغییرات LogfS2 در اندیس چالداغ بین 14- تا 16- بهدست آمد که منطبق با شرایط سولفیداسیون متوسط است. طبق شواهد بهنظر می رسد در اندیس طلای چالداغ، سیال گرمابی غنی از H2S هم زمان با فرایند کربنات زدایی و آزادشدن مقادیر بالای Fe2+ و As3+ در محیط، با این کاتیون ها واکنش داده و آرسنینپیریت تشکیل شده است. در پی این فرایند، ضمن کاهش محتوای H2S محیط، کمپلکس های بیسولفیدی Au(HS)2– تحت شرایط خنثی تا اسیدی و ماهیت اکسیدی محیط ناپایدار شده و به دنبال آن تهنشینی طلا رخداده است. | ||
کلیدواژهها | ||
آرسنین پیریت؛ شیمی کانه؛ ایزوتوپ گوگرد؛ طلا؛ اندیس چالداغ؛ زرشوران | ||
مراجع | ||
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