ژئوشیمی، کانه نگاری و توزیع عناصر خاکی کمیاب در گوسان های مرتبط با نهشته های سولفید توده ای آتشفشان زاد، مطالعه موردی: قلعه ریگی، جنوب غرب جیرفت، جنوب ایران

زمین شناسی اقتصادی

دوره 13، شماره 3 - شماره پیاپی 30، 1400، صفحه 537-559   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v13i3.86658

نویسندگان

حجت الله جهانگیری¹؛ سعید سعادت^{* 2}؛ سید احمد مظاهری¹؛ محمدرضا حیدریان شهری¹؛ محمد فودازی³؛ جعفر عمرانی⁴

¹گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

²گروه زمین شناسی و مهندسی نفت، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران

³گروه زمین شناسی، واحد اسلامشهر، دانشگاه آزاد اسلامی، اسلامشهر، ایران

⁴سازمان زمین شناسی و اکتشافات معدنی کشور، تهران، ایران

چکیده

محدوده قلعه ریگی در استان کرمان و جنوب ­غرب جیرفت قرار‌گرفته است. کانه ­زایی در این محدوده به صورت چینه ­سان در یک توالی آتشفشانی- رسوبی به سن ژوراسیک میانی- کرتاسه آغازین دیده می­ شود. هوازدگی سطحی زون­ های کانه ­دار موجب شده بخش اعظم سولفیدهای اولیه به اکسید و هیدروکسیدهای آهن تبدیل‌شده و گوسان تشکیل‌شود. بر اساس بررسی‌های میکروسکوپی و الکترونی، کانی‌های هماتیت، گوتیت، کوارتز و گروه ژاروسیت (نظیر ناتروژاروسیت و ژاروسیت) شناسایی شدند. نتایج تجزیه شیمیایی، بیانگر حضور مقادیر متوسط طلا (6/1 گرم در تن)، نقره (20 گرم در تن)، آرسنیک (11/0 درصدوزنی)، آنتیموان (58 گرم در تن)، مس (29/0 درصد وزنی)، سرب (2210 گرم در تن) و روی (497 گرم در تن) در افق ­های مختلف گوسان است. جایگاه زمین­ شناختی، الگوی توزیع عناصر خاکی کمیاب و غنی ­شدگی هرچند اندک؛ ولی مثبت Eu و زون­ بندی عناصر کانه ­ساز، گوسان­ های مورد بررسی را در دسته گوسان­ های غنی از طلا، بالغ و بارور مرتبط با ذخایر سولفید توده ­ای آتشفشان­ زاد قرار می­ دهد.

کلیدواژه‌ها

گوسان؛ سولفید توده ای آتشفشان زاد؛ ژئوشیمی؛ عناصر خاکی کمیاب؛ جیرفت؛ ایران

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