کانی شناسی، دگرسانی، میان بارهای سیال و زمین شیمی کانسار مس- طلای تپه‌ خرگوش (جنوب غرب اردستان)

زمین شناسی اقتصادی

مقاله 1، دوره 10، شماره 2 - شماره پیاپی 19، اسفند 1397، صفحه 299-324   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v10i2.62445

نویسندگان

الهام هاشمیان¹؛ حمایت جمالی^{* 1}؛ جمشید احمدیان²

¹اصفهان

²پیام نور

چکیده

کانسار تپه‌خرگوش در 15 کیلومتری جنوب‌غرب اردستان قرار دارد. رخنمون­‌های سنگی منطقه شامل آندزیت پورفیری، داسیت و ریولیت با سن ائوسن است که در میان آنها توف و ایگنمبریت نیز دیده می­ شود. در شمال محدوده نیز سنگ‌های رسوبی الیگو- میوسن دارای رخنمون هستند. رگه­‌های سیلیسی کانه­ دار در سنگ‌های ائوسن (آندزیت پورفیری، داسیت و توف­ های ریولیتی) تشکیل شده‌اند. دگرسانی‌ها از نوع سریسیتیک، آرژیلیک، پروپلیتیک و سیلیسی هستند. رگه‌های سیلیسی دارای ساخت و بافت­‌های نواری، رگه- رگه‌چه‌ای، برشی و پر‌کننده فضاهای خالی بوده و حاوی کانه­‌های اولیه پیریت، کالکوپیریت، بورنیت، کالکوسیت و طلا هستند. دمای همگن‌شدن میان‌­بارهای سیال از 137 تا 194 درجه سانتی‌گراد و شوری از 4 تا 5/12 درصد معادل وزنی نمک طعام متغیر است. ترکیب سنگ میزبان، نوع کانه­‌ها، ساخت و بافت، ژئومتری، دمای تشکیل، انواع دگرسانی­‌ها و زمین­‌شیمی کانسار، مشابه کانسارهای اپی­ترمال سولفیداسیون پایین است.

کلیدواژه‌ها

کانه‌ نگاری؛ دگرسانی، میان‌ بارهای سیال؛ ژئوشیمی؛ اپی‌ترمال سولفیداسیون پایین؛ تپه‌ خرگوش؛ اردستان

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