سامانه مدیریت نشریات علمی دانشگاه دامغان

فردوست, فرج الله, سلطانی, افسانه. (1404). بررسی سنگ‌شناسی و جایگاه زمین‌ساختی سنگ‌های آتشفشانی دربرگیرنده‌ی کانسار مس ابری (شمال‌غرب بردسکن). مجله زمین شیمی ایران, 26(1), 79-92. doi: 10.29252/ijcm.26.1.79
فرج الله فردوست; افسانه سلطانی. "بررسی سنگ‌شناسی و جایگاه زمین‌ساختی سنگ‌های آتشفشانی دربرگیرنده‌ی کانسار مس ابری (شمال‌غرب بردسکن)". مجله زمین شیمی ایران, 26, 1, 1404, 79-92. doi: 10.29252/ijcm.26.1.79
فردوست, فرج الله, سلطانی, افسانه. (1404). 'بررسی سنگ‌شناسی و جایگاه زمین‌ساختی سنگ‌های آتشفشانی دربرگیرنده‌ی کانسار مس ابری (شمال‌غرب بردسکن)', مجله زمین شیمی ایران, 26(1), pp. 79-92. doi: 10.29252/ijcm.26.1.79
فردوست, فرج الله, سلطانی, افسانه. بررسی سنگ‌شناسی و جایگاه زمین‌ساختی سنگ‌های آتشفشانی دربرگیرنده‌ی کانسار مس ابری (شمال‌غرب بردسکن). مجله زمین شیمی ایران, 1404; 26(1): 79-92. doi: 10.29252/ijcm.26.1.79

بررسی سنگ‌شناسی و جایگاه زمین‌ساختی سنگ‌های آتشفشانی دربرگیرنده‌ی کانسار مس ابری (شمال‌غرب بردسکن)

مجله بلورشناسی و کانی شناسی ایران
مقاله 6، دوره 26، شماره 1 - شماره پیاپی 69، فروردین 1397، صفحه 79-92    اصل مقاله (3.69 M)
شناسه دیجیتال (DOI): 10.29252/ijcm.26.1.79
نویسندگان
فرج الله فردوست* ؛ افسانه سلطانی
دانشگاه صنعتی شاهرود
چکیده
در 50 کیلومتری شمال­غرب بردسکن، سنگ­های آتشفشانی و آتشفشانی رسوبی ائوسن، به عنوان نوار ماگمایی شمال پهنه­ی ­ساختاری ایران­مرکزی میزبان کانسار مس ابری هستند. سنگ­های آتشفشانی دارای ترکیب غالب آندزیت، بازالت و آندزیت بازالت­پورفیری هستند و به صورت روانه­های گدازه­ای زیر آبی یا گدازه­های برشی­شده در حضور آب (آگلومرا)، یا خاکسترها و قطعات سنگی آتشفشانی (توفیت­ها) تظاهر پیدا کرده­اند و با سنگ­های رسوبی با طیف ترکیبی آهک (نومولیت­دار)، مارن، شیل و ... همراهند. آندزیت­ها و آندزیت­های­بازالتی به سری­های ماگمایی آهکی-قلیایی با پتاسیم متوسط تا بالا تعلّق دارند. تغییرات عناصر فرعی و الگوی عناصر خاکی نادر، غنی شده از عناصر LREE نسبت به HREE، به همراه غنی­شدگی در LILE و تهی­شدگی بعضی عناصر HFSE بیانگر وابستگی آنها به مناطق فرورانش است و تهی­شدگی از  Nbو تا حدودی Ti و تمرکز بالای Pb، Ba، K و  Thبیانگر آلایش پوسته‎ای ماگمای سازنده این سنگ­‎ها می‎باشد. شواهد ژئوشیمیایی بیانگر آنست که ماگمای سازنده این سنگ‎‎ها، از ذوب­بخشی گوه گوشته­ای تا حدودی دگرنهادی شده به وسیله­ی سیّالات سرچشمه گرفته از آب­زدایی ورقه اقیانوسی دگرگون­شده در رخساره آمفیبولیت و رسوبات فرورونده همراه آن، حاصل شده‎است. با توجه به ویژگی­های زمین­شناسی منطقه­ای، فرورانش رو به شمال ورقه اقیانوسی نئوتتیس سبزوار (شاخه درونه) به زیر حاشیه جنوبی ورقه توران، به تشکیل سنگ­های آتشفشانی کمان قاره­ای شمال­غرب بردسکن منجر شده است.     
کلیدواژه‌ها
آندزیت؛ کمان آتشفشانی؛ حاشیه فعال قاره‌ای؛ آلایش ماگمایی؛ بردسکن
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