زمین‌شیمی بیوتیت و شرایط تشکیل آن در گرانیتوئید هراران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران

2 گروه زمین‌شناسی، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

چکیده

بیوتیت اغلب به عنوان یک کانی سنگ­ساز در گستره وسیعی از سنگ­های نفوذی فلسی تا حدواسط تشکیل می­شود و بعلت ساختار بلوری پیچیده ناشی از جانشینی عناصر مختلف می­تواند شرایط فیزیکوشمیایی ماگمای مادر را ثبت کند. بیوتیت­های سنگ­های آذرین بررسی شده در منطقه هراران بر اساس تقسیم­بندی شیمیایی میکاها در مرز بین قطب فلوگوپیت و انیت قرار می­گیرند و منیزیم­دار هستند کـه نشان­دهنده تشکیل آنها در شرایط با گریزندگی اکسیژن بالاست و با توجه به مقادیر Mg،TiO2  و FeO، از نوع اولیه به حساب می­آیند. این بیوتیت­ها وابسته به سری ماگمایی آهکی قلیایی هستند که در محیط فرورانش تشکیل شده­اند. بر اساس شیمی بیوتیت­ها، گریزندگی اکسیژن در ماگمای مادر گرانیتوئیدهای هراران در گستره اکسیدهای آهن قرار دارد که نشان­دهنده گریزندگی اکسیژن بالا در زمان تشکیل آنهاست. زمین­دما­سنجی بیوتیت­های منطقه دمای تشکیل آنها را بین 680 تا 780 درجه سانتیگراد و فشار را کمتر از دوکیلو بار (1 تا 2 کیلوبار) بدست می­دهد.     

کلیدواژه‌ها

عنوان مقاله [English]

Geochemistry of biotite and its formation conditions in Hararan granitoid

نویسندگان [English]

  • Salimeh Dehghani Dashtabi 1
  • mohammad rahgoshay 1
  • shahriyar Mohammadi 2
1 Department of Petrology, Faculty of Earth Sciences, Shahid Beheshti university
2 Department of Geochemistry, Faculty of Earth Science, Kharazmi University, Tehran, Iran
چکیده [English]

Biotite is usually formed as a rock-forming mineral in a wide range of felsic to intermediate intrusive rocks. Due to complex crystal structure of biotite, different elements can substitute in this rock-forming mineral; therefore can record the physicochemical conditions of the source magma. Based on the chemical classification of mica, the biotites of the igneous rocks, investigated in the Hararan area, can be placed between the poles of phlogopite and annite, and are magnesium type, which indicates their formation in high oxygen fugacity, and according to the amounts of Mg, TiO2 and FeO oxides, these biotites are primary type. These biotites belong to the calc-alkaline magmatic series formed in the subduction environment. Based on the chemistry of biotites, oxygen fugacity in the source magma of Hararan granitoid is in the range of iron oxide. Geothermometry of biotites shows that these biotites formed at temperature ranging between 680 to 780 degrees Celsius and pressure of 2 (1-2) Kbars.

کلیدواژه‌ها [English]

  • Hararan
  • biotite
  • oxygen fugacity
  • geothermometry

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  • تاریخ دریافت: 07 اسفند 1401
  • تاریخ بازنگری: 26 اردیبهشت 1402
  • تاریخ پذیرش: 14 خرداد 1402

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