فرورانش دوسویه نامتقارن؛ نظریه جدید در مورد محیط تکتونوماگمایی و متالوژنی بلوک لوت، شرق ایران

زمین شناسی اقتصادی

مقاله 5، دوره 3، شماره 1 - شماره پیاپی 4، تیر 1390، صفحه 93-105   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v3i1.11445

نویسندگان

رضا ارجمندزاده^{* 1}؛ محمد حسن کریم پور¹؛ سید احمد مظاهری¹؛ ژوزه فرانسیسکو سانتوس²؛ جورج مدینا²؛ سید مسعود همام¹

¹فردوسی مشهد

²آویرو

چکیده

زون‌های فرورانش به‌سمت غرب، برخلاف زون‌های فرورانش به‌سمت شرق ویژگیهای مشترکی شامل ساختارهای کم‌ارتفاع، دراز گودال عمیق، صفحه فرورونده پرشیب و حوضه پشت‌قوسی مرکب دارند. محیط تکتونوماگماتیسم و متالوژنی بلوک لوت در حال حاضر مورد بحث است و نظریات بسیاری مطرح شده اند. علی رغم اینکه برخی مساله فرورانش را مردود دانسته اند، اکثر محققین فرورانش را به زیر بلوک افغان در نظر گرفته اند، اما عده ای معتقدند که پوسته اقیانوسی به زیر بلوک لوت کشیده شده است. نهشته های مس - طلای پورفیری در محیط ژئوتکتونیکی جزایر قوسی، طی ائوسن میانی تشکیل شده اند، در حالی‌که نهشته های مولیبدن دار در ارتباط با ضخیم‌شدگی پوسته طی الیگوسن بوده اند. در این مقاله، داده های جدید عناصر کمیاب و ژئوشیمی ایزوتوپی گرانیتوئیدهای بلوک لوت همراه با شواهد ساختاری ارائه می شوند که نشان‌دهنده فرورانش دوسویه نامتقارن به زیر هر دو بلوک لوت و افغان با سرعت‌های متفاوت پوسته اقیانوسی می باشد.

کلیدواژه‌ها

فرورانش نامتقارن؛ تکتونوماگماتیسم؛ بلوک لوت؛ بلوک افغان؛ داده های ژئوشیمی ایزوتوپی

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