زمین‌ شناسی، کانی سازی، ژئوشیمی اکتشافی، پتروژنز، سن‌ سنجی U-Pb و ایزوتوپ‌ های Lu-Hf روی کانی زیرکن توده های نیمه‌ عمیق در محدوده اکتشافی سیمرغ، بلوک لوت، شرق ایران

زمین شناسی اقتصادی

مقاله 6، دوره 11، شماره 1 - شماره پیاپی 20، 1398، صفحه 121-145   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v11i1.69424

نویسندگان

رضا برآبادی؛ سید احمد مظاهری^* ؛ محمد حسن کریم پور

دانشگاه فردوسی مشهد

چکیده

منطقه اکتشافی سیمرغ در مرکز بلوک لوت و جنوب‌غربی نهبندان قرار دارد. در این منطقه طیف گسترده‌ای از توده‌های نیمه‌عمیق به شکل استوک و دایک در درون واحدهای آتشفشانی نفوذ کرده‌اند و دگرسانی‌های مهمی مانند سیلیسی، کوارتز+ سریسیت+ پیریت، کربنات+ کوارتز+ سریسیت+ پیریت، پروپیلیتیک و آرژیلیک را به‌وجود آورده‌‌اند. این توده‌ها متا‌آلومینوس با ماهیت کالک‌آلکالن تا کالک‌آلکالن پتاسیم بالا هستند. غنی‌شدگی عناصر LREE نسبت به HREE همراه با آنومالی منفی Eu نشان‌دهنده تشکیل ماگما در زون فرورانش است. سه نوع کانی‌سازی افشان، رگچه‌ای و برش‌های هیدروترمال در این منطقه دیده می‌شود. میزان عنصر مس از 2 تا 240 گرم در تن، مولیبدن 5/0 تا 49 گرم در تن، آرسنیک 2 تا 207 گرم در تن و طلا 1 تا 93 میلی‌گرم در تن متغیر است. سن‌سنجی U-Pb در دو دایک گرانیت پورفیری سن‌های 56/0±37/25 و 76/0±94/25 میلیون سال و توده پیروکسن دیوریت پورفیری سن 51/0±85/24 میلیون سال را نشان می دهد. مقادیر مثبت پایین ɛHf(t) منشأ این توده‌ها را گوشته نشان می‌دهد که مقدار کمی با پوسته آغشتگی پیدا کرده است.

کلیدواژه‌ها

کانی سازی؛ توده های نیمه عمیق؛ کالک آلکالن؛ سن سنجی U-Pb؛ ایزوتوپ های Lu-Hf؛ سیمرغ؛ بلوک لوت

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