سنگ‌ شناسی سنگ‌ های آذرین الیگوسن لاله‌ زار در جنوب‌ شرق کمربند ماگمایی ساوه- نایین- جیرفت

زمین شناسی اقتصادی

دوره 16، شماره 4 - شماره پیاپی 43، 1403، صفحه 21-45   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.2024.1124

نویسندگان

فاطمه سپیدبر^* ؛ بهاره بروزی نیت

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

چکیده

سنگ‌های آذرین لاله‌زار در جنوب‌شرق ایران و در بخش جنوب‌شرقی کمربند ماگمایی ساوه- نایین- جیرفت واقع شده‌اند. در این پژوهش، سن‌سنجی  U-Pb زیرکن، داده‌های زمین‌شیمیایی و ایزوتوپی Sr-Nd سنگ کل بر روی سنگ‌های گرانیتوئیدی (گرانودیوریت و گرانیت) و آتشفشانی انجام‌شد. کانی های اصلی گرانودیوریت ­ها و گرانیت شامل کوارتز، پلاژیوکلاز، آلکالی فلدسپار‌، بیوتیت و آمفیبول با درصد متفاوت است.  سن‌سنجی U-Pb زیرکن نشان می‌دهد که جایگزینی توده گرانیتی در 28 میلیون سال قبل با جای‌گیری توده گرانودیوریتی در 24 میلیون سال قبل ادامه‌یافته است. این سنگ‌ها دارای تهی‌شدگی در Nb و Ti و غنی‌شدگی در عناصر نادر خاکی سبک و عناصر لیتوفیل بزرگ یون هستند. ویژگی‌های زمین‌شیمیایی آنها با ماگماتیسم کالک‌آلکالن معمولی (نسبت Sr/Y) (تقریباً <55)، ناهنجاری‌های منفی Eu (3/6-1/0 Eu/Eu*=) تشکیل آنها را در کمربند مرتبط با کوه‌زایی نشان می‌دهد. نتایج زمین‌شیمیایی و ایزوتوپی نشان می‌دهد که احتمالاً ذوب‌بخشی پوسته زیرین جوان (آمفیبولیت) با ضخامت کم با منشأ گوشته‌ای به ارث رسیده در یک زون فرورانش در منشأ این سنگ‌ها نقش‌داشته است.

کلیدواژه‌ها

فرورانش؛ کالک آلکالن؛ ذوب بخشی؛ لاله‌ زار؛ ساوه- نایین- جیرفت

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