زمین شناسی اقتصادی

زمین شناسی اقتصادی

بررسی کانه‌ زایی فلزهای گران‌ بهای سولفیداسیون پایین در پتانسیل معدنی کهیاز (شمال‌ شرق اصفهان) با تکیه بر شواهد زمین‌ شناسی، کانه‌ زایی، زمین‌ شیمی و میان‌ بارهای سیال

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکتری، گروه زمین‌شناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران
2 استاد، گروه زمین‌شناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران
3 دکتری، شرکت مشاوره‌ای اس.‌آر‌.کی، آلماتی، قزاقستان
4 استاد، گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران؛ گروه زمین‌شناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران
5 استادیار، گروه زمین‌شناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران
10.22067/econg.2026.1178
چکیده
پتانسیل معدنی کهیاز در 45 کیلومتری جنوب‌شرق شهرستان اردستان در استان اصفهان، در بخش مرکزی کمربند ماگمایی ساوه– نایین– جیرفت قرار دارد. رگه‌های سیلیسی حاوی طلا در واحدهای آتشفشانی آندزیتی- تراکی‌آندزیتی الیگوسن قرار گرفته‌اند. رگه اصلی کانه‌زایی دارای حدود 2 کیلومتر طول و عرض 2 تا 5 متر است. عیار طلا از 1/0 گرم بر تن تا 1/2 گرم بر تن متغیر است. الکتروم، کانی طلادار اصلی است. کانی‌های سولفیدی از جمله پیریت، کالکوپیریت، کالکوسیت، کوولیت به صورت فرعی تشکیل‌شده‌اند. کوارتز، کلسیت و آدولاریا مهم‌ترین کانی‌های باطله هستند. بافت‌های رگه- رگچه‌ای، گل‌کلمی، قشری، پرکننده فضای خالی و تیغه‌ای از جمله بافت‌های شاخص هستند. داده‌های زمین‌شیمیایی نشان‌دهنده همبستگی مثبت طلا با عناصر نقره و آنتیموان است و همبستگی منفی آن با آرسنیک، گوگرد و فلزهای پایه است. دگرسانی گرمابی شامل پروپیلیتیک، آرژیلیک متوسط و سیلیسی است. بررسی میان‌بارهای سیال در کوارتز مربوط به مرحله اول و اصلی کانه زایی نشان می‌دهد که سیالات کانه‌دار دارای دمای متوسط تا بالا (169 تا 278 درجه سانتی‌گراد) و شوری پایین تا متوسط (73/2 تا 29/10 درصد وزنی معادل نمک طعام) هستند که تحت‌تأثیر فرایندهای اختلاط و جوشش قرار گرفته‌اند. کانه‌زایی در کهیاز با کانه‌زایی در سامانه‌های سولفیداسیون پایین مطابقت دارد.
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