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پتروژنز گرانیتوئید نوع A خراسانلو، جنوب شرق زنجان: نشانه ای از ماگماتیسم کششی ائوسن در البرز غربی، ایران | ||
زمین شناسی اقتصادی | ||
مقاله 2، دوره 14، شماره 3 - شماره پیاپی 34، 1401، صفحه 37-64 اصل مقاله (2.27 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22067/econg.2022.70403.1023 | ||
نویسنده | ||
مژگان صلواتی* | ||
استادیار، گروه زمینشناسی، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران | ||
چکیده | ||
توده نفوذی خراسانلو، با طیف ترکیبی مونزونیت تا گرانیت، در 75 کیلومتری جنوبشرق زنجان در البرز غربی قرار دارد. این توده نفوذی در سنگ های ائوسن منطقه نفوذ کرده است. بر اساس بررسیهای سنگنگاری و زمینشیمیایی، سنگ های مجموعه نفوذی خراسانلو دارای ماهیت آلکالی- کلسیک تا آلکالی و از نوع پرآلومین و فروئن هستند. غنیشدگی 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 زمینساختی، نشاندهنده این موضوع است که توده نفوذی خراسانلو از نوع گرانیتوئید A2 بوده و در یک محیط پس از برخورد شکلگرفته است. به نظر می رسد که کشش حاصل از عقبگرد یا افزایش شیب ورقه فرورانده و بالاآمدگی آستنوسفر، پس از زمینساخت فشارشی حاکم بر منطقه، سبب ذوب پوسته و تشکیل گرانیتوئیدهای آلکالن جوان منطقه خراسانلو بوده است. | ||
کلیدواژهها | ||
گرانیتوئید نوع A؛ ماگماتیسم کششی؛ البرز غربی؛ زنجان؛ ایران | ||
مراجع | ||
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