نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، گروه علوم‌زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران
2 دانشیار، گروه علوم‌زمین، دانشگاه تبریز، دانشکده علوم طبیعی، تبریز، ایران
3 استاد، گروه علوم‌زمین، دانشگاه تبریز، دانشکده علوم طبیعی، تبریز، ایران
چکیده
مجموعه‌ی دگرگونی قطور در غرب خوی متشکل از انواع سنگهای دگرگونی متابازیت، سنگهای دگرگونی رسی و کوارتز-فلدسپاتی، سنگهای آهکی و سرپانتینیت است. سنگهای متاگابرویی بخش وسیعی از این مجموعه‌ی دگرگونی را شامل می‌شوند. پورفیروکلاست های پلاژیوکلاز و پیروکسن، کانی‌های باقی‌مانده‌از سنگ آذرین بوده و کانی‌های اپیدوت، ترمولیت-اکتینولیت، کلسیت و گاهی کلریت، کانی‌های ثانویه حاصل از دگرگونی درجه پایین هستند. براساس نتایج تجزیه‌ی شیمیایی سنگ‌کل، ترکیب سنگهای متاگابرویی مورد مطالعه کالک‌آلکالن است. در نمودارهای تفکیک محیط‌های زمین‌ساختی، ترکیب سنگهای مورد مطالعه ویژگی های جزایر قوسی را نشان می دهند. نتایج سن‌سنجی به روش U-Pb زیرکن، سن تشکیل پروتولیت گابرویی را 6/7 ± 6/162 میلیون سال منطبق بر زمان ژوراسیک بالایی (آکسفوردین) تعیین کرده است. تشکیل متاگابروهای قطور بر اساس نتایج ژئوشیمیایی و سنی بدست آمده از این پژوهش با احتمال می تواند مرتبط با حوضه پشت قوسی نئوتتیس در ایران مرکزی، یا ماگماتیسم جزایر قوسی ژوراسیک در زون سه وان-آکرا متعلق به زمین درز شاخه شمالی نئوتتیس و یا ادامه زون افیولیتی پیرانشهر و سرو متعلق به زون زاگرس-بیتلیس باشد اما در هر حال نتیجه گیری های دقیق نیازمند مطالعات تکتونیکی و داده های سن سنجی و ژئوشیمیایی بیشتر از انواع سنگهای دگرگونی و آذرین منطقه می باشد.
کلیدواژه‌ها
موضوعات
کتابنگاری
اسدپور، م.، هویس، ث.، پورمعافی، س. م.، 1392- شواهدی جدید از ماگماتیسم پرکامبرین و پالئوزوئیک در توده قره باغ، شمال غرب ایران. فصلنامه علوم زمین، سازمان زمین شناسی کشور. شماره 89، صفحه 129-142.
افتخارنژاد، ج.، 1359- تفکیک بخشهای مختلف ایران از نظر وضع ساختمانی در ارتباط با حوضههای رسوبی- نشریه انجمن نفت- شماره 82، صفحه 19-28.
نبوی، م. ح.، 1355- دیباچه‌ای بر زمین شناسی ایران. سازمان زمین شناسی کشور، 109 صفحه.
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