ژئوشیمی و پتروژنز توده نفوذی فشارک (شمال خاور شهر اصفهان)

زمین شناسی اقتصادی

مقاله 3، دوره 9، شماره 2 - شماره پیاپی 17، آبان 1396، صفحه 313-334   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v9i2.49676

نویسندگان

علی کنعانیان^{* 1}؛ فاطمه قهرمانی¹؛ فاطمه سرجوقیان²؛ جمشید احمدیان³؛ کاظم کاظمی¹

¹تهران

²دانشگاه کردستان

³پیام نور واحد اصفهان

چکیده

توده نفوذی فشارک با سن احتمالی الیگومیوسن، بخش کوچکی از نوار ماگمایی ارومیه- دختر شمرده می شود و شامل دو فاز تزریق گرانودیوریتی و کوارتز دیوریتی است که ترکیب گرانودیوریتی در برخی نواحی به ترکیب گرانیت و تونالیت متمایل شده است. این‌ سنگ‌ها شامل برون‌بوم‌های نسبتاً فراوان کوارتز دیوریتی و کوارتز مونزودیوریتی است. این توده نفوذی دارای کانی های اصلی کوارتز، فلدسپار، بیوتیت، آمفیبول و پیروکسن با بافت گرانولار است؛ در صورتی که در برون‌بوم‌ها دارای ترکیب کانی شناسی مشابه با توده نفوذی است، ولی بافت میکروگرانولار نشان می دهد. نمودار عناصر کمیاب خاکی عادی‌سازی شده به کندریت همراه با افزایش میزان Ba و کاهش جزئی Sr با افزایش Rb، بیانگر نقش تفریق فلدسپار در تحولات ماگمایی است. نمودارهای تمایزکننده محیط زمین‌ساختی همراه با غنی‌شدگی از عناصر ناسازگار LILE و LREE نسبت به عناصر HFSE و HREE و آنومالی منفی عناصر Nb، Ti و Eu نمایانگر شکل‌گیری این سنگ‌ها در مناطق مرتبط با فرورانش در حاشیه فعال قاره‌ای است. نمودارهای تعیین کننده منشأ سنگ‌ها بیانگر نقش گسترده پوسته قاره‌ای آمفیبولیتی در شکل‌گیری توده نفوذی فشارک است.

کلیدواژه‌ها

توده نفوذی؛ پتروژنز؛ محیط زمین‌ ساختی؛ فشارک؛ اصفهان؛ ارومیه- دختر

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