کانی‌شناسی، زمین‌شیمی و جایگاه زمین‌ساختی آمفیبولیت‌های مجموعه دگرگونی محمودآباد (جنوب‌شرق شاهین‌دژ)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه بین‌المللی امام خمینی(ره)

2 دانشگاه پیام نور

چکیده

مجموعه دگرگونی محمودآباد بخشی از پهنه دگرگونی سنندج- سیرجان است که در جنوب­شرق شاهین­دژ برون­زد دارد. سنگ­های دگرگونی مجموعه محمودآباد اغلب متاپلیت بوده و برون­زدهای محدودی از متابازیت­های توده­ای و برگواره­دار در این مجموعه حضور دارند، که در این پژوهش متابازیت­های این مجموعه بررسی شده­اند. متابازیت­ها کانی­شناسی آمفیبول و پلاژیوکلاز را نشان می­دهند که معرف رخساره آمفیبولیت هستند. ترکیب شیمی پلاژیوکلاز از نوع آندزین و لابرادوریت و آمفیبول از نوع منیزیوهورنبلند و ترمولیت است. نتایج دما- فشارسنجی محاسبه شده به روش­های مختلف، دمای 430 تا 750 درجه سانتی­گراد و فشار 6 تا 13 کیلوبار را نشان می­دهند که تقریباً معادل شیب زمین­گرمایی 20 تا 25 درجه سانتی­گراد بر کیلومتر است. برپایه داده­های زمین­شیمیایی سنگ کل، آمفیبولیت­های مجموعه محمودآباد از نوع ارتوآمفیبولیت بوده و بیشتر ترکیب بازالتی دارند. شاخص­های زمین­شیمیایی این آمفیبولیت­ها با جایگاه زمین­ساختی پشت قوس قاره­ای همخوانی دارد. احتمالاً آمفیبولیت­های مجموعه محمودآباد، معرف فعالیت ماگمایی مافیک جایگاه پشت قوس قاره­ای ناشی از فرورانش حوضه اقیانوسی نئوتتیس به زیر سنگ­کره قاره­ای سنندج- سیرجان است که دستخوش دگرگونی کرانه فعال قاره­ای یا برخورد شده­اند.     

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogy, geochemistry and tectonic setting of amphibolites from Mahmoudabad metamorphic complex (SE Shahindezh)

نویسندگان [English]

  • Hajighorbani 1
  • mohsen Nasrabady 1
  • Mahbobeh Jamshidibadr 2
  • Zainab Davoudi 1
1 Imam Khomeini International University
2 Payam Noor University
چکیده [English]

 Mahmoudabad metamorphic complex is a part of Sanandaj-Sirjan metamorphic zone that cropped out in SE Shahindezh. Metapelites are the main lithology of Mahmoudabad complex and there are restricted exposures of foliated and granoblastic metabasites present in this complex as well. Metabasites of this complex are investigated in this research. Metabasites display amphibole and plagioclase mineralogy that indicating amphibolite facies. Chemical composition of plagioclase is andesine and labradorite and amphibole is magnesiohornblende and tremolite. Thermobarometry results, that calculated by different methods, display temperature between 430 to 750 centigrade and pressure 6 to 13 kilo bars that are almost equivalent geothermal gradient between 20 to 25 centigrade per kilometer. According to the whole rock geochemical data, the amphibolites of Mahmoudabad complex are orthoamphibolite type and are mostly basaltic in composition. Geochemical signatures of these amphibolites are compatible with tectonic setting of continental back arc. Probably, Mahmoudabad complex amphibolites, are indication of mafic magmatism in the continental back arc setting, arisen from Neotethy oceanic basin seduction beneath continental lithosphere of Sanandaj-Sirjan, that have been experienced collision or continental active margin metamorphism.

کلیدواژه‌ها [English]

  • amphibolite
  • Thermobarometry
  • continental back arc setting
  • Mahmoudabad metamorphic complex

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  • تاریخ دریافت: 30 مرداد 1396
  • تاریخ بازنگری: 08 دی 1396
  • تاریخ پذیرش: 09 بهمن 1396

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