سنگ‌زایی گدازه‌های بالشی با تکیه بر داده‌های کانی‌شناسی و زمین‌شیمیایی در بخش شرقی افیولیت سبزوار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه اصفهان

2 دانشگاه فرار

چکیده

 گدازه‌های بالشی افیولیت سبزوار دارای بافت‌های واریولیتی، پورفیری با خمیره ریزسنگی، میان دانه­ای و بادامی و کانی‌های پلاژیوکلاز، کلینوپیروکسن (اوژیت- دیوپسید)، اولیوین، آمفیبول (منیزیوهاستینگزیت) و کانی‌های کدر هستند. ترکیب شیمیایی کلینوپیروکسن‌ها سری ماگمایی آهکی-قلیایی و محیط زمین­ساختی بازالت‌های قلیایی درون­صفحه‌ای نشان می‌دهند. این سنگ‌ها از نظر زمین شیمیایی، دو گروه 1) در اصل آندزیت، آهکی-قلیایی و دارای TiO2 پایین و 2) بازالت‌های‌قلیایی با TiO2 بالا تقسیم می­شوند. با توجه به نمودار عناصر کمیاب بهنجار شده نسبت به بازالت های پشته های میان اقیانوسی مورب عادی ((N-MORB، گروه 1 غنی‌شدگی در Th، U، La و تهی‌شدگی در Ta، Nb و Ti و گروه 2 غنی‌شدگی Th، Ta و Nb نشان می‌دهند. سنگ‌های آهکی-قلیایی در محیط زمین­ساختی فرورانش و در اثر پوسته قاره‌ای تولید شده و در جنوب صفحه توران فوران یافته­اند. برخلاف آن، سنگ‌های قلیایی در صفحه اقیانوسی تشکیل می‌شوند و سپس به طور زمین ساختی به مجموعه جلوی قوس افزوده می‌گردند.     

کلیدواژه‌ها

عنوان مقاله [English]

Petrogenesis of pillow lavas based on mineralogical and geochemical data in the eastern part of Sabzevar ophiolite

نویسندگان [English]

  • Zahra Rezaei 1
  • Mousa Noghreyan 1
  • Emilio Saccani 2
1 University of Isfahan
2 University of Ferrara
چکیده [English]

Sabzevar ophiolitic pillow lavas contain variolitic, porphyritic with microlitic matrix, intersertal and amygdaloidal textures and include plagioclase, clinopyroxene (augite-diopside), olivine, amphibole (magnesiohastingsite) and opaque minerals. The chemical composition of clinopyroxenes show a calc-alkaline magmatic series and a tectonic environment within plate alkaline basalts. Geochemically, these rocks are divided into two groups. Group 1 is basically calc-alkaline andesite with low TiO2 and group 2 is alkali basalt with high TiO2. N-MORB normalized trace elements diagram shows that group 1 is enriched in Th, U, La and depletion in Ta, Nb, Ti and group 2 is enriched in Th, Ta and Nb. Calc-alkaline rocks have produced in a subducted tectonic environment by a continental crust and erupted southwards on the Turan plate. In contrast, alkaline rocks formed within plate oceanic and then tectonically accreted in the forearc setting.

کلیدواژه‌ها [English]

  • Sabzevar ophiolite
  • pillow lava
  • Mineral chemistry
  • Mesozoic
  • northeast Iran

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  • تاریخ دریافت: 17 شهریور 1397
  • تاریخ بازنگری: 07 آذر 1397
  • تاریخ پذیرش: 10 دی 1397

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