زمین شناسی، کانی سازی، سن سنجی U-Pb و ژئوشیمی ایزوتوپ های Sr-Nd توده های نفوذی شمال شرق کاشمر

زمین شناسی اقتصادی

مقاله 4، دوره 7، شماره 1 - شماره پیاپی 12، تیر 1394، صفحه 69-90   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v7i1.44721

نویسندگان

علیرضا الماسی¹؛ محمد حسن کریم پور^{* 1}؛ خسرو ابراهیمی نصرآبادی¹؛ بهنام رحیمی¹؛ اورس کلوتزلی²؛ ژوزه فرانسیسکو سانتوس³

¹فردوسی مشهد

²وین

³آویرو

چکیده

محدوده مطالعاتی در 30 کیلومتری شمال شرق کاشمر قرار دارد. براساس سن سنجی زیرکن توده های نفوذی نوع I (سن 40 میلیون سال)، در زمان ائوسن و در پاسخ به فشارش ناحیه ای، حرکات امتدادلغز چپ‌گرد گسلهای درونه و تکنار سبب رخداد زون برشی، حوضه pull-apart و شکستگیهای ریدل شده که شرایط را برای صعود ماگما و محلول گرمابی مهیا کرده است. طی تکامل ساختاری منطقه، چند ضربان ماگمایی کالکوآلکالن تا آلکالن پتاسیم بالا تا شوشونیتی نوع I و یک پالس نوع A در منطقه نفوذ کرده است. مقادیر اولیه 87Sr/86Sr (706/0-705/0) و 143Nd/144Nd (5126/0-5125/0) برای سری I، منشأ پوسته قاره ای با دخالت گوشته (فرورانش) را نشان می دهد. ماگمای عامل دسته دایک های کوارتزمونزونیتی جدید نوع I، سبب دگرسانیها و کانی سازی IOCG در منطقه شده است. دو مرحله چرخش محلول گرمابی اکسیدان آهن دار سبب دگرسانیهای آرژیلیک پیشرفته، سرسیتی، سیلیسی، اکسیدآهن، کربناتی، اپیدوتی و کلریتی و کانی سازی رگه ای سولفید فلزات پایه و رگه های IOCG غنی از اسپکیولاریت در منطقه شده است.

کلیدواژه‌ها

زون برشی؛ ماگماتیسم نوع I و A؛ سن سنجی U-Pb زیرکن؛ ایزوتوپ های Sr-Nd؛ فرورانش؛ IOCG

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