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Asadi S A, Ghorbani G, Shafaii Moghadam H. Geochronology and isotope geology of the Late Neoproterozoic granitic and gneissic rocks of the Neybaz complex (West of Saghand). www.ijcm.ir 2019; 27 (4) :897-908
URL: http://ijcm.ir/article-1-1371-fa.html
URL: http://ijcm.ir/article-1-1371-fa.html
اسدی سیدعلی اکبر، قربانی قاسم، شفائی مقدم هادی. سن‌سنجی و زمین‌شناسی ایزوتوپی گنیس‌ها و گرانیتهای نئوپروتروزوئیک‌پایانی مجموعه نیباز (غرب ساغند). مجله بلورشناسی و کانی شناسی ایران. 1398; 27 (4) :897-908
1- دانشگاه دامغان
چکیده: (2736 مشاهده)
مجموعه آذرین – دگرگونی نیباز (غرب ساغند، شمال یزد) یکی از سرزمینهای پیسنگی ایران به سن نئوپروتروزوئیک پایانی است که طیف گستردهای از سنگ‌های دگرگونی و آذرین را شامل میشود. در برخی بخشهای رسی دگرگونه این مجموعه میتوان شواهد بارزی از ذوببخشی، میگماتیتزایی و میلونیتزایی را مشاهده کرد. سنسنجیهای انجام شده به روش K-Ar، Rb–Srو حتی U-Pb بر این مجموعه و مجموعههای سنگی همجوار (چون چاپدونی، تاشک و زمان آباد) چندین گستره سنی از پروتروزوئیک پایانی تا میوسن را نشان میدهند، ولی وجود کنگلومرای سرشار از قلوههای گرانیتی و گنیسی سرچشمه گرفته از سرزمینهای پیسنگی در قاعده توالی رسوبی کرتاسه جنوبغرب ساغند بیانگر نادرست بودن سنهای جوانتر از کرتاسه نسبت داده‌شده به مجموعه نیباز است. بعضی از سنهای گزارششده نیز تنها میتوانند بازتابی از رخدادهای زمینساختی و زمینساختی دگرگونی باشند که در دورههای مختلف، بر این مجموعه و مجموعههای پیسنگی همجوار تأثیر گذاشتهاند که از آن جمله میتوان به دگرگونی در ژوراسیک میانی و فعالیتهای ماگمایی در ائوسن تا میوسن اشاره کرد. براساس شواهد منطقهای و روابط صحرایی، گستره زمانی570 تا 530 میلیون سال پیش با واقعیتهای زمین‌شناسی منطقهای بیشتر همخوانی دارد. رخدادهای این گستره زمانی به احتمال زیاد بخشی از دگرگونیهای کوهزایی کادومین بوده است. بررسی ایزوتوپهای هافنیم گرانیتهای این مجموعه نشان میدهد که eHf نمونههای مورد بررسی دارای مقادیر منفی بوده و از 02/1- تا 87/18- متغیّر است. مقادیر منفی eHf با سرچشمه گرفتن مذاب‌های گرانیتی از ذوب سنگ‌های پوستهای یا همان گنیسهای مجموعه نیباز (غرب ساغند) همخوانی دارد.
واژه‌های کلیدی: سن‌سنجی، نئوپروتروزوئیک، هافنیم، گرانیت، گنیس، نیباز، ساغند.
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