سنگ‌شناسی و جایگاه زمین‌ساختی سنگ‌های آتشفشانی ترشیری سهند (جنوب تبریز)

نویسندگان

1 استاد یار پترولوژی دانشگاه آزاد واحد شبستر

2 استادپترولوژی دانشکده علوم دانشگاه تبریز

10.22077/jt.2016.404

چکیده

چکیده
سنگ‌های آتشفشانی ترشیری در جنوب تبریز درون نهشته‌های رسوبی الیگو- میوسن برونزد دارند. آتشفشان سهند در شمال غرب ایران، یک استراتوولکان و در برگیرنده فعالیت‌های انفجاری(شامل مواد آذرآواری ) و جریان‌های گدازه‌ای میوسن- کواترنری است. آخرین مرحله از فوران این آتشفشان شامل گنبدهای نیمه آتشفشانی- آتشفشانی با ترکیب داسیتی تا ریولیتی می‌باشد. این سنگ‌ها دارای ویژگی‌های پتروگرافی از جمله: بافت غربالی و زونینگ در پلاژیوکلازها است. فراوانی پلاژیوکلاز و آمفیبول، غنی شدگی از Ba ، Rb و Sr و آنومالی منفی از Nb و Y در نمودارهای چند عنصری عادی سازی شده با ترکیب گوشته آغازین، غنی شدگی از LREE نسبت به HREE نیز در الگوی توزیع عناصر نادر خاکی عادی سازی شده نسبت به کندریت، ویژگی‌های بارز سنگ‌های آتشفشانی سهند است. این ویژگی‌ها و نیز جایگاه این سنگ‌ها در نمودار Y-Sr/Y، ترکیب آداکیتی این سنگ‌ها را نشان می‌دهد. سنگ‌های آداکیتی سهند از نوع آداکیت‌های پرسیلیس است. این سنگ‌ها حاصل ذوب بخشی پوسته‌ای (پوسته قاره‌ای پایینی ضخیم شده یا پوسته اقیانوسی) با ترکیب سنگ منشأ گارنت‌دار است که در مسیر صعود دچار تحولات ماگمایی شده‌اند و در ارتباط با برخورد قاره‌ای اوراسیا- عربی تشکیل شده‌اند

کلیدواژه‌ها


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