پتروژنز گرانیتوئید نوع A خراسانلو، جنوب شرق زنجان: نشانه‌ ای از ماگماتیسم کششی ائوسن در البرز غربی، ایران

نوع مقاله : مقاله پژوهشی

نویسنده

دپارتمان زمین شناسی، دانشکده علوم، دانشگاه آزاد اسلامی واحد لاهیجان، لاهیجان، ایران

چکیده

توده نفوذی خراسانلو، با طیف ترکیبی مونزونیت تا گرانیت، در 75 کیلومتری جنوب شرق زنجان در البرز باختری قرار دارد. این توده نفوذی در سنگ‌های ائوسن منطقه نفوذ نموده‌اند. بر اساس مطالعات پتروگرافی و ژئوشیمیایی سنگ‌های مجموعه نفوذی خراسانلو دارای ماهیت آلکالی-کلسیک تا آلکالی و از نوع پرآلومین و فروئن می باشند. غنی شدگی از عناصر نادر خاکی سبک ، مقادیر نسبتاً بالای عناصر با شدت میدان بالا، در مقایسه با دیگر گرانیتوئیدها، بالا بودن نسبت Ga/Al و قرارگیری نمونه‌ها در موقعیت گرانیتوئیدهای نوع A در نمودارهای تمایز محیط زمین ساختی، نشان دهنده این موضوع است که توده نفوذی خراسانلو از نوع گرانیتوئید A2 بوده و در یک محیط پس از برخورد شکل گرفته است.
به نظر می رسد که کشش حاصل از عقبگرد یا افزایش شیب ورقه فرورانده و بالاآمدگی آستنوسفر، پس از تکتونیک فشارشی حاکم بر منطقه، سبب ذوب پوسته و تشکیل گرانیتوئیدهای آلکالن جوان منطقه خراسانلو بوده است .

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