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علی کنعانیان فاطمه قهرمانی فاطمه سرجوقیان جمشید احمدیان کاظم کاظمی

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.

جزئیات مقاله

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ارجاع به مقاله
کنعانیانع., قهرمانیف., سرجوقیانف., احمدیانج., & کاظمیک. (۱۳۹۶-۰۸-۳۰). ژئوشیمی و پتروژنز توده نفوذی فشارک (شمال خاور شهر اصفهان). زمین‌شناسی اقتصادی, 9(2), 313-334. https://doi.org/10.22067/econg.v9i2.49676
نوع مقاله
علمی- پژوهشی