توزیع اندازه‌ی درشت بلور‌های لوئیسیت، پیروکسن و اولیوین در خروجی‌های حاشیه‌ی شرقی دریاچه‌ی ارومیه- بررسی احتمال هم‌آمیزی و زمان اقامت در اتاقک ماگمایی

نوع مقاله : مقاله پژوهشی

نویسنده

دانشگاه ارومیه

چکیده

منطقه­ی مورد بررسی در فاصله­ی 1 کیلومتری شبه جزیره­ی اسلامی در شرق دریاچه ارومیه و در نزدیکی روستای آق گنبد واقع است. سنگ­ها وابسته به سنوزوئیک تا پلیوکواترنر با ترکیب فنولیت تا لوئیسیتیت با ماهیت شوشونیتی دارای الگوی جدایش یافته­ای از عناصر خاکی نادر هستند، جایگاه زمین ساختی درون­صفحه­ای و مربوط به رخدادهای پس از برخورد داشته و برخی نشانه­های زمین­شیمیایی اشاره به دخالت پوسته در ترکیب ماگمای مولد آن دارند. در این پژوهش درشت بلور­های لوئیسیت، پیروکسن و اولیوین موجود در این سنگ­ها از دیدگاه توزیع اندازه­ی بلور (CSD) بررسی شده است. منحنی­های رسم شده برای بلورها­ی پیروکسن و اولیوین متفاوت با بلورهای لوئیسیت است. منحنی­های پیروکسن و اولیوین بصورت خطی هستند که نشانگر تک­نسل بودن آنهاست، در مقابل منحنی­های رسم شده­ی بلورهای لوئیسیت بصورت شکسته و انحنادار هستند که نشان از دونسل بودن آنها و رخدادهم­آمیزی ماگمایی دارد. میانگین زمان لازم برای تشکیل هسته، درشت شدگی (با در نظر گرفتن سرعت رشد متوسط کانی­های سیلیکاتی
cm/s  11-10 G =) و اقامت در اتاقک ماگمایی برای بلورهای دانه­درشت لوئیسیت و بلورهای پیروکسن حدود 200 سال و برای بلورهای الیوین و بلورهای دانه­ریز لوئیسیت کمتر از 100 سال بوده است. با محاسبه عرض از مبداء نمودارهای نام برده مشخص شد که دست کم 12 هسته سیلیکاتی در واحد زمان در لانه ماگمایی در حال بسته شدن بوده است.    

کلیدواژه‌ها

عنوان مقاله [English]

Crystal size distribution studies on the leucite, pyroxene and olivine at the eastern Urmia Lake volcanic rocks- magma mixing possibility and residence time at the chamber

نویسنده [English]

  • Monir Mojarrad
چکیده [English]

The study area is located at the eastern Urmia Lake near Aghgonbad village with 1Km distance from Eslami peninsula. The rocks are under saturated and belonging to the Cenozoic to Pelio- Quaternary with shoshonitic affinities and are phonolite to luecitite. The chondorite normalized REE patterns show LREEs enrichment related to HREEs. Some geochemical characteristics are correlated with continental within-plate setting and have post-collisional resemblance accompany with crustal contamination. Crystal Size Distribution (CSD) patterns have been drawn for leucite, pyroxene and olivine crystals. It is observed that the curve is fractured and curvature for leucite, with fine and coarse grains, that is sign of two magma mixing. But the patterns for olivine and pyroxene are linear. The average times for nucleation, growth and suspension at the chamber for leucite fine grains and olivine are less than 100 years and for pyroxene and coarse leucites residence time are >200 years, if growth rate is 10-11 cm/year. The intercept values calculations show that at least 12 silicate nuclei at the same time  was formed, at the chamber. 
 

کلیدواژه‌ها [English]

  • CSD
  • leucite
  • pyroxene
  • olivine
  • nucleation rate
  • residense time

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  • تاریخ دریافت: 07 بهمن 1396
  • تاریخ بازنگری: 17 اردیبهشت 1397
  • تاریخ پذیرش: 22 خرداد 1397

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