نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکترا، گروه زمین‌شناسی، دانشگاه تربیت مدرس، تهران، ایران
2 دانشیار، گروه زمین‌شناسی، دانشگاه تربیت مدرس، تهران، ایران
3 دکترا، سازمان زمین‌شناسی و اکتشافات معدنی کشور، تهران، ایران
چکیده
مجموعة دگرگونی بنه‌شورو در شرق روستای ساغند و در حوزة ایران مرکزی واقع شده‌است. این مجموعه از گنایسهای کوارتز-فلدسپاتیک (کانی تیرة کمتر از 5 درصد)، بیوتیت -آمفیبول گنایس ، واحدهای متابازیت، انواع شیست با میان لایههایی از مرمر و کوارتزیت و نفوذیهای مافیک و اسیدی تشکیل شده که مجموعاً دگرگونی قهقرایی در حد رخسارة آمفیبولیت پایینی را متحمل شدهاند. مطالعة ژئوشیمیایی متابازیت‌های این مجموعه در کوه زمان‌آباد و پشتة گلمنده، بیانگر وجود دو الگوی توزیع غنی شدة متفاوت در نمودارهای به هنجار شدة عناصر فرعی و کمیاب این سنگ‌ها نسبت به MORB می‌باشد. الگوی اول فاقد و الگوی دوم دارای آنومالی منفی در Nb و Taاست. مطالعة ژئوشیمی سنگ کل به همراه نسبت‌های ایزوتوپیSr-Nd، بیانگر دخالت دو منشأ گوشته‌ای متفاوت در تشکیل ماگمای مادر متابازیت‌ها در یک محیط پشت قوسی است. منبع گوشته‌ای غنی از تیتانیوم، مانند دنبالة پلوم‌های گوشته‌ای در تشکیل نمونه‌های غنی از Ta و Nb وگوشتة غنی شدة قدیمی متأثر از فرورانش در تشکیل نمونه‌های تهی‌شده از Ta و Nb نقش دارد.
کلیدواژه‌ها
موضوعات
References
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