بررسی‌ های دگرسانی، کانه نگاری، زمین‌ شیمی و سیالات درگیر در محدوده اکتشافی جفت رود، جنوب‌ غرب بیرجند

زمین شناسی اقتصادی

دوره 16، شماره 4 - شماره پیاپی 43، 1403، صفحه 1-20   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.2024.1130

نویسندگان

امید شرعی‌ پور¹؛ آزاده ملکزاده شفارودی^{* 2}؛ مریم جاویدی مقدم³

¹کارشناسی ارشد، گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

²استاد، گروه زمین شناسی و گروه پژوهشی اکتشاف ذخایر معدنی شرق ایران، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

³دکتری، گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

محدوده اکتشافی جفت‌رود در مرکز بلوک لوت و 60 کیلومتری جنوب­ غرب بیرجند واقع‌شده است. این محدوده دارای برون‌زدهایی از واحدهای آذرآواری (توف آندزیتی)، آتشفشانی (هورنبلند آندزیت، پیروکسن آندزیت، آندزیت بازالتی) و توده ­های نفوذی (دیوریت پورفیری، مونزودیوریت، گابرو) است. کانی‌سازی به شکل رگه ­ای با امتداد اغلب شمال ­شرق‌– جنوب‌غرب در واحدهای آندزیتی تشکیل‌شده است. دگرسانی ­های عمده شامل سیلیسی، آرژیلیک، کربناته و پروپلیتیک است. کانی ­های اولیه شامل پیریت، کالکوپیریت و کانی­ های ثانویه شامل مالاکیت، آزوریت، کریزوکلا، کالکوسیت، کوولیت، گوتیت و هماتیت هستند. بیشترین بی­ هنجاری­های زمین‌شیمی در رگه­ ها برای مس 6000 گرم در تن، سرب 2934 گرم در تن، روی 6904 گرم در تن و طلا 144 میلی ­گرم در تن است. رگه ­های کوارتز-سولفید از سیالاتی با دمای 265 تا 408 درجه سانتی­ گراد و شوری­ های 1/11 تا 19 درصد وزنی NaCl تشکیل شده ­اند. کاهش دما و همچنین اختلاط با سیالی با شوری بیشتر می­ تواند باعث ته ­نشینی فلزها شده باشد. محدوده اکتشافی بر اساس شواهدی مانند کنترل ساختاری کانی­ سازی، نوع دگرسانی ­ها و گسترش خطی آنها، کانی ­شناسی، بافت، داده ­های سیالات درگیر و عمق تشکیل مشابه کانسارهای سولفید متوسط است.

کلیدواژه‌ها

کانی‌سازی؛ فلزهای پایه؛ سیالات درگیر؛ جفت‌ رود؛ بلوک لوت

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