دوره 30، شماره 4 - ( 10-1401 )
جلد 30 شماره 4 صفحات 652-639 |
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Badrzadeh Z, Aghazadeh M, Fayaz F. Geochemistry, Petrogenesis and dating of lamprophyric dykes in the Kaleybar area, NW Iran. www.ijcm.ir 2022; 30 (4) :639-652
URL: http://ijcm.ir/article-1-1812-fa.html
URL: http://ijcm.ir/article-1-1812-fa.html
بدرزاده زهرا، آقازاده مهراج، فیاض فرناز. زمین‌شیمی، سنگ‌زایی و تعیین سن دایک‌های لامپروفیری کلیبر، شمال‌غرب ایران. مجله بلورشناسی و کانی شناسی ایران. 1401; 30 (4) :639-652
زهرا بدرزاده* 
1، مهراج آقازاده1 ، فرناز فیاض1
1، مهراج آقازاده1 ، فرناز فیاض1
1- دانشگاه پیام نور
چکیده: (834 مشاهده)
دایک‌های لامپروفیری به همراه انواع دایک‌های بازانیتی و آندزیتی با اندازههای مختلف در جنوب و جنوب‌شرق شهرستان کلیبر با روند شمال‌غرب –جنوب‌شرق درون نهشته‌های نوع فلیش و آتشفشانی کرتاسه-پالئوسن جایگزین شده‌اند. دایک‌های لامپروفیری بافت پورفیری و درشت‌بلورهای بیوتیت و شکل دروغین بلورهای پیروکسن را دارند. براساس ویژگی‌های کانی‌شناسی و زمین شیمیایی، لامپروفیرهای مورد بررسی از نوع آهکی قلیایی و مینت هستند. در نمودار‌های عناصر خاکی نادر و عنکبوتی، لامپروفیرهای مورد بررسی غنی‌شدگی از عناصر خاکی نادر سبک (LREE) و عناصر سنگ دوست بزرگ یون (LILE) و تهی‌شدگی از عناصر با شدت میدان بالا (HFSE) را نشان می‌دهند. ویژگی‌های زمین شیمیایی دایک‌های لامپروفیری گویای تشکیل آنها از ذوب‌بخشی 1-3 درصدی گوشته گارنت‌لرزولیتی دربردارنده رگچه‌های فلوگوپیت بوده که پیشتر توسط مذاب‌های ناشی از فرورانش دگرنهاده شده است. براساس سن‌سنجی Ar-Ar بلورهای بیوتیت، دایک‌های لامپروفیری مورد بررسی31-32 میلیون سال پیش (الیگوسن‌میانی) در یک محیط قوس آتشفشانی جایگزین شده‌اند.
واژه‌های کلیدی: لامپروفیر، مینت، سنگ‌زایی، تعیین سن آرگون-آرگون، کلیبر.
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