سنگ‌نگاری، زمین شیمی و جایگاه زمین‌ساختی توده‌های نفوذی منطقه قره بلاغ در شمال هشترود، آذربایجان شرقی، شمال غرب ایران

نویسندگان

1 دانشگاه تبریز

2 دانشگاه محقق اردبیلی

چکیده

فعالیت­های ماگمایی طی سنوزوئیک موجب جایگیری توده­های نفوذی متعددی در پهنه البرز غربی- آذربایجان به­ویژه در نوار بستان آباد - میانه شده است. این توده­های نفوذی به سن الیگومیوسن شامل ­گرانیت قلیایی، گرانودیوریت و بیوتیت گرانیت، در سنگ­های آتشفشانی-رسوبی ائوسن نفوذ کرده­اند. بافت­های دانه­ای، گرافیکی و پرتیتی از مهمترین بافت­های این سنگ­ها هستند. بررسی­های زمین شیمیایی نشان می­دهد که این سنگ ها هم­خاستگاه بوده و سرشت ماگمایی آنها آهکی­قلیایی تا آهکی قلیایی پتاسیم بالا، متاآلومین و از گرانیتوئیدهای نوع I هستند. غنی­شدگی از عناصر سنگ­دوست بزرگ­یون (LILE) مانند Cs, K, Rb, Th نسبت به عناصر با شدت میدان بالا (HFSE) مانند Ti, Zr, Nb و بی­هنجاری منفی شاخص در Nb و Ti و همچنین غنی­شدگی از عناصر خاکی­نادر سبک (LREE) نسبت به عناصر خاکی­نادر سنگین ((HREE نشان­دهنده پیدایش این سنگ­ها در پهنه ماگمایی بالای پهنه فرورانش است. ناهنجاری مثبت Pb و K نشان دهنده دخالت پوسته­ای در تکامل ماگمای مادر آنهاست. هنگام بالا آمدن ماگما، فرایندهای هضم، آلایش پوسته­ای و جدایش بلورین رخ داده است. نمودارهای شناسایی پهنه­های زمین­ساختی بیانگر قوس­های آتشفشانی و محیط­های اواخر برخورد تا بعد از تصادم در پهنه کمان بالغ در پوسته­ی قاره­ای با ستبرای کم (کمتر از 45 کیلومتر) است. ماگمای اولیه از ذوب بخشی پریدوتیت های غنی شده گوه گوشته­ای پدید آمده است.       

کلیدواژه‌ها


عنوان مقاله [English]

Petrography, geochemistry and tectonic setting of the Gharabolagh intrusive mass in North Hashtrud, East Azarbaijan

نویسندگان [English]

  • Marziyeh Rezaei Aghdam 1
  • Ahmad Jahangiri 1
  • Mohsen Moayyed 1
  • ghahraman Sohrabi 2
1
2
چکیده [English]

The plutonic body of Bostanabad-Meyaneh belt formed during the Cenozoic magmatism on the weast Alborz-Azarbaijan zone. The Oligocene plutonic rocks consist of alkaligranite, granodiorite and biotitegranite, intruded into the Eocene volcanic-sedimentary rocks. The predominant textures are granular, graphic and perthite. Geochemical evidence reveals that they are cogenetic and have features typical of calk-alkaline to high-K calk-alkaline, metaluminous with I-type nature. Enrichment in LILE (i.e. Cs, K, Rb and Th) rather than HFSE (Eg., Nb, Zr and Ti), typical negative anomalies of Nb and Ti and LREE enrichment in comparison to HREE, are important characteristics indicating that these rocks were formed in a magmatic belt in a subduction zone. Positive anomalies of Pb and K demonstrate the involvement of continental crust in evolution of parental magma. During magma ascent, assimilation processes, fractional crystallization and crustal contamination (AFC) took place simultaneously. Tectonic discrimination diagrams show formation of these rocks in VAG, Syn-COLG event and an mature continental arc setting with less than 45 Km crustal thickness. Primitive magmas should have formed by low degree melting of an enriched mantle wedge peridotite.

کلیدواژه‌ها [English]

  • petrography
  • Geochemistry
  • tectonic setting
  • Gharabolagh
  • Intrusive mass
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