سنگ شناسی، زمین شیمی و منشأ سنگهای آتشفشانی منطقه شمال‌ غرب گناباد

زمین شناسی اقتصادی

مقاله 9، دوره 8، شماره 1 - شماره پیاپی 14، تیر 1395، صفحه 265-282   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v8i1.48865

نویسندگان

صدیقه زیرجانی زاده¹؛ محمد حسن کریم پور^{* 1}؛ خسرو ابراهیمی نصرآبادی¹؛ ژوزه فرانسیسکو سانتوس²

¹فردوسی مشهد

²آویرو

چکیده

محدوده مورد بررسی، در شرق ایران، شمال بلوک لوت و شمال غرب گناباد واقع شده است. این محدوده شامل برون‌زدهایی از سنگهای آتشفشانی ائوسن با ترکیب آندزیت تا ریولیتی است که واحد های نیمه عمیق و عمیق گرانیتی تا دیوریتی در آنها نفوذ کرده است. در این بررسی پتروژنز واحدهای آتشفشانی که بیشترین گسترش را دارند، مورد بررسی قرار گرفت. واحدهای پیروکلاستیک و گدازه با دامنه، ریولیت، ریوداسیت، داسیت، آندزیت، تراکیت و تراکی آندزیت در منطقه شناسایی شدند. بافت غالب این واحدها پورفیری، هیالوپورفیری و میکرولیتی و شامل کانیهای پلاژیوکلاز، آلکالی‌فلدسپار نوع سانیدین، هورنبلند، بیوتیت و کوارتز هستند. بررسیهای ژئوشیمیایی حاصل از این پژوهش، نشان می دهد که این سنگها، ماهیت کالک آلکالن پتاسیم بالا دارد و در محدوده متاآلومینوس و پرآلومینوس قرار می گیرند. سنگهای آتشفشانی غنی شدگی LREE/HREE (LaN/YbN طیفی از 3/53 تا 15/47) و آنومالی منفی Eu. (با متوسط 0/54 =Eu*/EuN) نشان می دهند. پایین بودن نسبت Al2O3/CaO+Na2O+K2O و شواهد ژئوشیمی عناصر نادر خاکی و کمیاب، نشان می دهد که منشأ ماگمای اولیه از پوسته بوده که در طی فرورانش شکل گرفته است. بر اساس نسبت ایزوتوپ اولیه 87Sr/86Sr، ماگمای شکل دهنده واحد های آندزیتی و ریولیتی از ذوب‌بخشی پوسته زیرین نشأت گرفته است.

کلیدواژه‌ها

ایزوتوپ اولیه 87Sr/86Sr؛ ژئوشیمی؛ سنگهای آتشفشانی؛ بلوک لوت؛ شرق ایران

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