نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، پژوهشکده علوم زمین، سازمان زمین‌شناسی و اکتشافات معدنی کشور، تهران، ایران

2 کارشناسی ارشد، پژوهشکده علوم زمین، سازمان زمین‌شناسی و اکتشافات معدنی کشور، مرکز سنندج، سنندج، ایران

3 دکترا، سازمان زمین شناسی و اکتشافات معدنی کشور، مرکز تبریز، تبریز، ایران

چکیده

سنگ های آتشفشانی نئوژن، در جنوب عرب آباد، بلوک لوت رخنمون دارند. سنگ های آتشفشانی مورد مطالعه، گدازه های آتشفشانی ائوسن، الیگوسن و نهشته های تبخیری نئوژن را پوشانده اند. توالی آتشفشانی نئوژن در قاعده شامل برش و توف است که به صورتی تدریجی توسط گدازه-های آندزیتی، تراکی آندزیتی و داسیتی پوشانده شده اند. این گدازه ها دارای بافت آفیریک-فیریک و خمیره میکرولیتی تا هیالومیکرولیتی هستند. این گدازه ها، گرایش ماگمایی کالک آلکالن دارند. در الگوهای عناصر نادر و نمودارهای عنکبوتی، غنی شدگی از LILE و LREE در مقایسه با HREE داشته و تهی شدگی آشکار HFSE دارند، که مشابه ولکانیسم مناطق فرورانش است. در نمودارهای تکتونوماگمایی، این گدازه ها در قلمروی فرورانش و پسابرخورد جای می گیرند. تفسیر داده های ژئوشیمیایی دلالت بر آن دارد که گدازه های مورد مطالعه، احتمالا حاصل ذوب بخشی گوشته لیتوسفری هستند که قبلا توسط مولفه های فرورانش (سیالات و مذاب) رها شده از صفحه اقیانوسی فرورو غنی شده اند. ذوب بخشی پوسته احتمالا در ژنز گدازه های اسیدی نقش داشته است. بنظر می رسد که طی نئوژن، نازک شدگی لیتوسفر سبب ذوب بخشی گوشته لیتوسفری زیرقاره ای شده است. این فرایندها احتمالا پیامد بالا آمدگی آستنوسفر و قطعه شدگی لیتوسفر بوده است.

کلیدواژه‌ها

موضوعات

کتابنگاری

بانه­ای، ن.، 1396- پترولوژی سنگ­های آتشفشانی الیگوسن و نئوژن محدوده ده ته، جنوب دیهوک، بلوک لوت. پایانامه کارشناسی ارشد، پژوهشکده علوم زمین، 102ص. 

فریدی، م.، 1384- نقشه زمین­شناسی زنوغان با مقیاس1:100.000سازمان زمین­شناسی و اکتشافات معدنی کشور، نقشه شماره 7555.

کیلانی جعفری ثانی، ز.، 1396-پترولوژی سنگ­های آتشفشانی ائوسن در باختر سه چنگی.  پایانامه کارشناسی ارشد، پژوهشکده علوم زمین،   132ص.                                                 

خلعت­بری جعفری، م.، 1379- نقشه زمین­شناسی رباط خوشاب با مقیاس 1:100.000سازمان زمین­شناسی و اکتشافات معدنی کشور، نقشه شماره 7557.

 

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