مطالعه شیمی کانی¬ها، زمین دما – فشار سنجی و جایگاه تکتونیکی گابروهای شمال غرب همدان، باختر ایران
الموضوعات :عادل ساکی 1 , هوشنگ پورکاسب 2 , علیرضا زراسوندی 3 , میلاد جهانی 4 , مریم درانی 5
1 -
2 - دانشگاه شهید چمران اهواز
3 - گروه زمین شناسی، دانشکده علوم زمین، دانشگاه شهید چمران اهواز، اهواز، ایران
4 - دانشگاه شهید چمران اهواز
5 - دانشگاه شهید باهنر کرمان
الکلمات المفتاحية: شیمی کانی آمفیبول زمین دما – فشار سنجی جایگاه تکتونیکی گابرو همدان,
ملخص المقالة :
منطقه مورد مطالعه از نظر زمین شناسی در ناحیه شمالی زون دگرگونی سنندج – سیرجان قرارگرفته است. بر اساس مطالعات پتروگرافی کانی های اصلی پلاژیوکلاز، پیروکسن، آمفیبول و بیوتیت و کانی های فرعی کلریت، مسکویت، ایلمنیت و زیرکن می باشند. نتایج به‌دست‌آمده از بررسی شیمی کانی ها نشان می دهد که آمفیبول های مورد مطالعه جزء آمفیبول های کلسیک می باشند. از نظر ترکیب شیمیایی می توان آن ها را پارگاسیت، چرماکیت و منیزیو هورنبلند نام‌گذاری نمود. پلاژیوکلازها نیز از نوع آندزین هستند. با توجه به نسبت پایین Na2O از نظر محیط تکتونیکی نیز این آمفیبول ها از نوع S-Amph هستند. میزان بالای Al2O3 بیانگر این است که منشا آمفیبول ها گوشته ای می باشد و بر اساس نسبت Fetot (Fetot + Mg+2) در برابر AlIv که کمتر از 6/0می باشد می توان نتیجه گرفت که گریزندگی اکسیژن بالا است. از سوی دیگر می توان گفت که میزان آب برای تبلور هورنبلند از 2 تا 3/2 متغیر است. برای انجام دماسنجی و فشارسنجی نیز از روش های مختلفی استفاده شده است که بهترین آن نشان می دهد دمای تشکیل توده گابرویی در محدوده 700 درجه سانتی گراد (به‌طور میانگین) می باشد و فشار این سنگ ها نیز بین 45/4 تا 50/7 متغیر است. با توجه به فشار به‌دست‌آمده ماگمای مورد نظر از عمق 25 تا 30 کیلومتری منشا گرفته است که در نزدیکی مرز موهو است.
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