نوع مقاله : مقاله پژوهشی
نویسنده
استادیار، گروه زمین‌شناسی، دانشگاه پیام نور، ایران
چکیده
ترکیب عمومی توده گرانیتوئیدی چلتیان که در منتهی‌الیه جنوب‌شرقی زون سنندج-سیرجان قرار گرفته است، ترونجمیتی Al پایین با ماهیت تولئیتی تا ترانزیشنال می‌باشد. این توده درون نهشته‌های رسوبی-آتشفشانی اوایل مزوزوئیک نفوذ نموده است. برپایه سن‌سنجی بلورهای زیرکن که به روش(SHRIMP) Pb-U انجام شد، سن توده مورد مطالعه187.5±3.2 میلیون سال برآورد شده است. توده مورد مطالعه دارای Al2O3 کمتر از 15wt.%، نسبت Sr/Y پایین، REE کمتر تفریق‌یافته و نسبت (La/Yb)N پایین می‌باشد. در نمودارهای عنکبوتی عادی‌شده نسبت به گوشته اولیه نمونه‌های مورد مطالعه غنی‌شدگی از عناصر LILEs مانند K، Rb، Ba و Th نسبت به HFSEs مانند Nb، Ta و Ti نشان می‌دهند که ویژگی شاخص سنگ‌های وابسته به کمان می‌باشد. براساس ویژگی‌های زمین‌شناسی و ژئوشیمیایی ماگمای منشأ توده مورد مطالعه از ذوب بخشی دهیدراسیون سنگ مادر مافیک با ترکیب آمفیبولیتی در فشار کم حاصل شده و در یک حوضه کششی وابسته به فرورانش در اوایل ژوراسیک میانی جایگزین شده است.
کلیدواژه‌ها
موضوعات
کتابنگاری
باباخانی، ع.، 1371- نقشه زمین‌شناسی سبزواران با مقیاس 1:250000، نقشه زمین‌شناسی تصحیح شده کارشناسان یوگسلاوی، سازمان زمین‌شناسی و اکتشافات معدنی کشور.
شهرکی قدیمی، ع.، 1383- نقشه زمین‌شناسی 1:100000 اسفندقه، سازمان زمین‌شناسی و اکتشافات معدنی کشور.
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