پلوتونیسم شوشونیتی، آداکیتی (C-type)و لامپروفیری پس از برخورد در توده خانکندی، ارسباران (شمال باختر ایران)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم، دانشگاه پیام نور، تهران، ایران

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

3 گروه زمین‌شناسی ، دانشکده علوم، دانشگاه تربیت مدرس، تهران، ایران

4 گروه زمین‌شناسی، دانشگاه هولوآ، هولوآ، اسپانیا

چکیده

توده خانکندی در شمال باختر ایران و پهنه قره داغ (ارسباران)- ارمنستان جنوبی قرار دارد. رخنمون‌های چیره شامل سنگ‌های گرانودیوریتی و مونزونیتی هستند که همراه با آنها گابروها و دایک‌های داسیتی و لامپروفیری نیز رخنمون دارند. پلوتونیسم گرانودیوریتی در توده خانکندی با نفوذ مونزونیت‌ها و گابروها دنبال ‌شده است و در نهایت دایک‌های داسیتی و لامپروفیری جایگزین شده‌اند. مونزونیت‌ها و گابروها، ماهیت شوشونیتی و گرانودیوریت‌ها و داسیت‌ها ماهیت کلسیمی- قلیایی پتاسیم بالا و ویژگی‌های آداکیت‌های نوع C (پتاسیمی یا قاره‌ای) و گرانیتوییدهای سرشار از باریم و استرانسیم را نشان می‌دهند. لامپروفیرها ماهیت قلیایی و کامپتونیتی دارند. مونزونیت‌ها از تحول گابروها همراه با مقدارکمی آلایش پوسته‌ای و آمیختگی ایجاد شده‌اند. ذوب منابع پوسته مافیک زیرین گارنت‌دار، گوشته سنگ‌کره‌ای(لیتوسفری) متاسوماتیسم شده و نرم‌کره (استنوسفر)بالارونده، به‌ترتیب سبب ایجاد ماگماهای گرانودیوریتی و داسیتی، گابروی شوشونیتی و لامپروفیرها شده است. تولید انواع مختلف ماگماها در منطقه ارسباران در الیگوسن، در پاسخ به فرایندهای شکسته‌شدن قطعه فرورونده ویا پوسته‌پوسته‌شدن (Delamination) گوشته سنگ‌کره‌ای و بالا آمدن نرم‌کره رخ داده است که پس از فرایند برخورد ورقه‌‌های ایران و عربستان و ستبرشدگی پوسته‌ای، در یک محیط کششی پس از برخوردی تشکیل شده‌اند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Post-Collisional Shoshonitic, C-type Adakitic and Lamprophyric Plutonism in the Khankandi Pluton, Arasbaran (NW Iran)

نویسندگان [English]

  • M. Aghazadeh 1
  • M. H. Emami 2
  • H. Moin Vaziri 3
  • N. Rashidnezhad Omran 3
  • A. Castro 4
1 Department of Geology, Faculty of Science, Payeme Noor University, Tehran, Iran
2 Research Institute of the Earth Sciences, Geological survey of Iran, Tehran, Iran
3 Department of Geology, Faculty of Science, Tarbiat Modares University, Tehran, Iran
4 Department of Geology, University of Huelva, Huelva, Spain
چکیده [English]

Khankandi pluton is located in northwestren part of Iran, within Garadagh (Arasbaran) - south Armenia block. Main units of the pluton are monzonite and granodiorite associated with minor gabbro and lamprophyric and dacitic dykes. Granodioritic plutonism is followed by gabbro and monzonite. Lamprophyric and dacitic dykes are emplaced at the end of the granodioritic plutonism. Gabbro and monzonites are shoshonitic, and granodiorites and dacites have high K-calc alkaline nature and charactistics of C-type (potassic or continental) adakites and high Ba-Sr granitoides. Lamprophyres are alkaline and have camptonitic composition. The monzonites follow fractionation trend of gabbro with minor crustal assimilation and contamination. Melting of garnet bearing mafic lower crust, metasomatised lithospheric mantle and upwelling asthenosphere produced granodioritic and dacitic, shoshonitic gabbro and lamprophyric magma respectively. The production of various magma types in the Oligocene of the Arasbaran occurred in response to slab break off and/or delamination of lithospheric mantle and upwelling of asthenosphere. Plutonism occurred after collision between Iranian and Arabian plates and crustal thickening in the extensional post collisional tectonic setting.

کلیدواژه‌ها [English]

  • Plutonism
  • Post-Collision
  • Shoshonitic
  • C-type Adakite
  • Lamprophyre
  • Khankandi
  • Arasbaran
  • NW Iran
کتابنگاری
آقازاده، م.، 1385- نقشه زمینشناسی توده خانکندی و نواحی مجاور به مقیاس 1:20000.
آقازاده ، م.، 1388- پترولوژی و ژئوشیمی توده‌های نفوذی شمال و شرق اهر (شیورداغ، خانکندی، انزان و یوسفلو) با نگرشی بر کانی زایی وابسته، رساله دکتری، دانشگاه تربیت مدرس،  470 صفحه
آقانباتی، س. ع.، 1383- زمین‌شناسی ایران، انتشارات سازمان زمینشناسی کشور.
زمانی، دولق، ر.، 1379- مطالعه زمینشناسی و پتروژئوشیمیایی سنگ‌های پلوتونیک و ولکانیک تودههای جنوب غرب مشکینشهر و ارتباط با ژنز مس و مولیبدن؛ رساله کارشناسی ارشد دانشگاه تبریز، 379 صفحه.
نقشه زمین‌شناسی چهارگوش اهر به مقیاس 1:250000، 1370- سازمان زمین‌شناسی کشور.
 
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