پترولوژی سنگ¬های آتشفشانی الیگوسن گستره ده¬ته، جنوب دیهوک، بلوک لوت
الموضوعات :مرتضی خلعتبری جعفری 1 , نرمین بانه ای 2 , محمد فریدی 3
1 - پژوهشکده علوم زمین، سازمان زمین¬شناسی و اکتشافات معدنی کشور،
2 - سازمان زمین¬شناسی کشور، مدیریت سنندج
3 - سازمان زمین¬شناسی و اکتشافات معدنی کشور، مدیریت مرکز تبریز
الکلمات المفتاحية: آندزیت, آمیختگی ماگمایی, پسا برخوردی, کالک¬آلکالن ,
ملخص المقالة :
محدوده مورد مطالعه، در جنوب ده ته، بلوک لوت، دربردارنده گدازه های آتشفشانی الیگوسن با ترکیب آندزیت، تراکی آندزیت، تراکی داسیت، داسیت و ریولیت است. این گدازه ها، دارای بافت پورفیریک و پورفیریتیک بوده و فنوکریست آمفیبول فراوان دارند. بیشتر گدازه های الیگوسن، روندهای ماگمایی کالک آلکالن تا کالک آلکالن پتاسیم بالا را نشان می دهند. در نمودارهای دوتایی، نمونه های گدازه های آندزیتی و تراکی آندزیتی در قلمرویی جدای از گدازه های تراکی داسیتی، داسیتی و ریولیتی اجتماع یافته اند که نشان می دهد تفریق ماگمایی، بهتنهایی در ژنز این گدازه ها تاثیر نداشته است. در الگوهای عناصر نادر خاکی و نمودارهای عنکبوتی، این گدازه ها غنی شدگی عناصر کمیاب دارای یون بزرگ و تهی شدگی از عناصر کمیاب با شدت میدان بالا را نشان می دهند. الگوهای به هنجار شده از گدازه های آندزیتی و تراکی آندزیتی، انطباق قابل توجهی با قلمروی بازالت جزیره اقیانوسی دارند. الگوهای گدازه های اسیدی، قابل مقایسه با الگوهای پوسته قاره ای بالایی هستند. این ویژگی-های ژئوشیمیایی، دلالت بر این دارند، که گدازه های آندزیتی و تراکی آندزیتی، از ذوب بخشی گوشته لیتوسفری منشاء گرفته اند، که پیش از این توسط مولفه های فرورانش (مذاب و سیالات) غنی شده اند. در ژنز گدازه های اسیدی نیز ذوب بخشی پوسته قاره ای، نقش مهمی داشته است. بر اساس موقعیت زمین شناسی و داده های ژئوشیمیایی، به نظر می رسد که گدازه های آتشفشانی الیگوسن ده ته، در یک پهنه پسابرخورد، در پسامد نازک شدگی لیتوسفر قاره ای، در بلوک لوت تشکیل شده اند. این فرایندها، شاید پیامد قطعه شدگی لیتوسفر بوده است، که در یک کمربند کوهزایی پسابرخورد روی داده است.
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