نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده زمین‌شناسی، پردیس علوم، دانشگاه تهران، تهران، ایران
2 دانشکده فیزیک و علوم زمین، دانشگاه ریوکیوس، اوکیناوا، ژاپن
3 دانشکده علوم زمین، دانشگاه ساسکچوان، ساسکتون، کانادا
4 دانشکده کانی‌شناسی و منابع معدنی، دانشگاه صنعتی کلاستال، کلاستال-زلرفلد، آلمان
چکیده
آنالیزهای ژئوشیمیایی سنگ کل و ایزوتوپ‌های Sr-Nd-Pb سنگ‌های نفوذی منطقه چادرملو، ارتباط با تاریخچه ماگمایی کوهزایی کادومین حاشیه شمالی گندوانا در طول پرکامبرین پایانی-اوایل پالئوزوییک را نشان می‌دهد. گرچه این آنالیزها نشان‌دهنده شباهت‌های ژئوشیمیایی از جمله کالک آلکالن بودن، غنی‌شدگی در عناصر لیتوفیل درشت‌یون مانند Rb، Ba، K و Cs، تهی‌شدگی عناصری مانند Nb، Ta، P، Ti و الگوهای عناصر خاکی کمیاب را از خود نشان می‌دهند، اما داده‌های ایزوتوپی Sr-Nd سنگ‌های مورد مطالعه منطقه آشکارا گویای ناهم‌منشأ بودن نمونه‌های بازیک (گابرویی) و فلسیک (گرانیتی) می‌باشند به‌گونه‌ای‌که، این داده‌های Sr-Nd سنگ کل (1/8- 3/6-= ɛNd(t)) به همراه نسبت بالای (207Pb/206Pb)t نشان‌دهنده یک مذاب مشتق شده از پوسته قاره‌ای برای گرانیتوییدها و منشأ گوشته‌ای برای گابروهاست. سن‌های به‌دست آمده از این دو گروه سنگی نیز نشان می‌دهد که گابروها قدیمی‌تر از گرانیتوییدها می‌باشند. رژیم زمین‌ساخت کششی به‌وسیله عقب‌نشینی یا دی‌لامیناسیون صفحات باعث ذوب مجدد سنگ‌های آذرین قدیمی مربوط به کمان و برهم‌کنش با پی‌سنگ قاره‌ای کامبرین شده و مذاب‌های گرانتیوییدی منطقه مورد مطالعه را شکل می‌دهد. در الگوهای بهنجارشده عناصر خاکی کمیاب گابروها نسبت به کندریت‌ها، اختلاط ژئوشیمیایی و ایزوتوپی و افزایش نسبت‌های LREE/HREE به خوبی دیده می‌شوند که شواهدی بر ناهمگنی گوشته و برهم‌کنش با پی‌سنگ پالئوپروتروزوییک است.
کلیدواژه‌ها
موضوعات
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