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پتروگرافی، زمین شیمی و زمین ساخت توده گرانیتی هریس، استان آذربایجان شرقی: شاهدی بر ماگماتیسم درون صفحه ای وابسته به ریفت | ||
زمین شناسی اقتصادی | ||
مقاله 7، دوره 14، شماره 2 - شماره پیاپی 33، 1401، صفحه 143-163 اصل مقاله (1.18 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22067/econg.2022.72028.1035 | ||
نویسندگان | ||
فرهاد پیرمحمدی علیشاه* 1؛ مهدی محمدرضایی2؛ احمد جهانگیری3 | ||
1استادیار، گروه زمینشناسی، دانشکده فنی و مهندسی، واحد شبستر، دانشگاه آزاد اسلامی، شبستر، ایران | ||
2استادیار، گروه عمران، دانشکده فنی و مهندسی، مرکز تسوج، دانشگاه آزاد اسلامی، تسوج، ایران | ||
3استاد، گروه زمین شناسی، دانشکده علوم زمین، دانشگاه تبریز، تبریز، ایران | ||
چکیده | ||
توده گرانیتی هریس از ﻟﺤﺎظ زمین شناسی بخشی از زون ﺳﺎﺧﺘﻤﺎﻧﻲ اﻟﺒﺮز ﻏﺮﺑﻲ- آذرﺑﺎﻳﺠﺎن ﻣﺤﺴﻮب می شود. این توده سازند کهر را قطع کرده و خود با رسوبهای پرمین با دگرشیبی آذرینپی پوشیده میشود. ترکیب سنگشناسی توده مورد بررسی، آلکالی فلدسپار گرانیت است و ﺑﺎﻓﺖ غالب و ﻋﻤﺪه سنگها دانهای و پرتیتی است. کانیهای اصلی این سنگها شامل کوارتز، فلدسپار پتاسیم، پلاژیوکلاز و کانیهای فرعی شامل بیوتیت، آمفیبول، پیروکسن، آپاتیت، اسفن و زیرکن است. بیهنجاری منفی Eu در نمودار REE نشاندهنده حضور پلاژیوکلاز در سنگ خاستگاه و یا جدایش پلاژیوکلاز در طول تکامل ماگمای تشکیلدهنده این سنگهاست. بررسیهای زمینشیمیایی نشان میدهد که گرانیتهای مورد بررسی دارای ماهیت نوع A هستند و به دلیل فقیر بودن از Nb، در گستره A2 قرار میگیرند. غنیشدگی نسبی از LILEs به ویژه Rb و Th و فقیرشدگی از عناصر Nb، Sr، Eu، Ba و Ti نشاندهنده خاستگاه پوستهای آن است که در یک محیط کششی احتمالاً مرتبط با ریفت جایگیری کردهاند. بررسیهای انجامشده خاستگاه ذوببخشی پوسته زیرین با ترکیب تونالیتی- گرانودیوریتی را برای این گرانیتها نشان میدهد. | ||
کلیدواژهها | ||
هریس؛ گرانیت؛ سنگ شناسی؛ ماگماتیسم؛ ریفت درون قاره ای | ||
مراجع | ||
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