یافته‌های نوین زمین‌شناسی کاربردی

یافته‌های نوین زمین‌شناسی کاربردی

زمین ­شیمی، منشأ و شرایط تشکیل گرانیتوئیدهای مجموعه آتشفشانی- نفوذی ماهیرود، جنوب شرق سربیشه (شرق ایران)

نویسندگان
1 کارشناس‌ارشد زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه لرستان، خرم‌آباد، ایران
2 دانشیار گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه لرستان، خرم‌آباد، ایران
3 دانشجوی دکترا، گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه بیرجند، بیرجند، ایران
4 کارشناس‌ارشد زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه شهید چمران اهواز، اهواز، ایران
چکیده
توده­ی گرانیتوئیدی مورد مطالعه بخشی از مجموعه آتشفشانی ـ نفوذی ماهیرود (چشمه استاد) در جنوب شرقی سربیشه (استان خراسان جنوبی) محسوب می­شود. ترکیب این توده عمدتا گرانودیوریت- تونالیت بوده و کانی­های اصلی سازنده آن شامل پلاژیوکلاز، کوارتز، ارتوز و هورنبلند به صورت متوسط تا درشت بلور با بافت گرانولار است. براساس شیمی کانی، آمفیبول‌‌‌ها از نوع کلسیک و در زیر گروه مگنزیوهورنبلند قرار می­گیرند. این کانی در فوگاسیته­ی اکسیژن بالا و شرایط فشار 5/0 تا 2 کیلوبار و دمای بین 700 تا 725 درجه­ی سانتی‌گراد متبلور شده ‌است. براساس نتایج زمین‌شیمی، توده­ی گرانیتوئیدی ماهیرود در محدوده‌ی گرانیت‌های تیپ I، متاآلومین و کالک‌آلکالن قرار می­گیرد که از طریق ذوب بخشی سنگ‌های گوشته‌ای شکل گرفته ­است؛ به گونه­ای که به ترتیب La و Dy با افزایش نسبت‌های La/Sm و Dy/Yb افزایش می‌یابند و کمتر از 5 درصد رسوبات فرورانش شده و سیال به منبع ماگمایی وارد شده ­است. نمودار عنکبوتی عناصر کمیاب بهنجار شده با گوشته­ی اولیه، غنی­شدگی نسبی با شیب ملایم از عناصر LREE نسبت به HREE نشان می­دهد. توده­ی گرانیتوئیدی مذکور به گرانیت­های مرتبط با فرورانش شباهت داشته و با حضور کمان ماگمایی کالک‌آلکالن شرق ایران که حاصل فرورانش ورقه­ی اقیانوسی نئوتتیس (اقیانوس سیستان) به زیر زون شرق ایران است، سازگار می­باشد.
کلیدواژه‌ها

عنوان مقاله English

Geochemistry and petrogenesis of the granitoid rocks in Mahiroud volcano-plutonic complex, Southeast of Sarbisheh (Eastern of Iran)

نویسندگان English

A. Davodi 1
A. Ahmadi Khalaji 2
Sh. Keshtgar 3
P. Eskandarnia 4
Z. Tahmasbi 2
1 M. Sc., of Geology, Faculty of Science, Lorestan University, Khorramabad, Iran
2 Assoc. Prof., Dept., of Geology, Faculty of Science, Lorestan University, Khorramabad, Iran
3 Assoc. Prof., Dept., of Geology, Faculty of Science, Lorestan University, Khorramabad, Iran
4 M. Sc., of Geology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده English

The study granitoid pluton is a part of the Mahiroud (Cheshmeh Ostad) volcano-plutonic complex in the southeast of Sarbisheh (South Khorasan province). The composition of this pluton is mostly granodiorite-tonalite. Its main minerals include plagioclase, quartz, orthose and hornblende with granular texture. Based on mineral chemistry, amphiboles in these rocks have a calcic composition and are placed in the Mg-hornblende subgroup. These amphiboles crystallized under pressure conditions of 0.5 to 2 kbar, temperature between 700 - 725 ºC and high oxygen fugacity. Based on the geochemical results, this granitoid pluton is in the range of type I, metalunimous and calc-alkaline granites. Also, this puloton is been formed through mantle partial melting so that La and Dy increase with the increase of La/Sm and Dy/Yb ratios. These rocks were formed through partial melting and less than 5% of sediments have been subducted and fluid has entered the magma source. The spider diagram of trace elements normalized with the primary mantle shows relative enrichment with a gentle slope of LREE elements compared to HREE. This granitoid pluton is similar to subduction-related granites and is consistent with the calc-alkaline magmatic arc in the eastern of Iran which is the result of the subduction of the Neotethys oceanic plate (Sistan Ocean) under the eastern zone of Iran.

کلیدواژه‌ها English

High oxygen fugacity
Calc-alkaline
Granodiorite
Subduction-related granites
Mahiroud
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  • تاریخ دریافت 25 فروردین 1403
  • تاریخ بازنگری 18 تیر 1403
  • تاریخ پذیرش 20 شهریور 1403