کانی شناسی و ژئوشیمی گنیس‌های کمپلکس گل‌گوهر، جنوب استان کرمان
الموضوعات :
حسین فاتحی
1
(علوم)
الکلمات المفتاحية: گنیس# کمپلکس گل‌گوهر# استان کرمان# زون سنندج-سیرجان#,
ملخص المقالة :
گنیس‌های کمپلکس دگرگونی گل‌گوهر در جنوب استان کرمان و در جنوب شرق زون دگرگونی سنندج-سیرجان با پروتولیت گرانیتوئیدی درجاتی از رخساره شیست سبز تا آمفیبولیت زیرین را در اثر فاز کوهزایی سیمرین پیشین تحمل کرده‌اند. آن‌ها دارای ترکیب کانی‌شناسی فلدسپات پتاسیم، پلایوکلاز، بیوتیت، کوارتز و گارنت می‌باشند و آپاتیت، ایلمنیت، اسفن، کلریت و موسکویت نیز از فازهای فرعی موجود در آن‌ها می‌باشند. محاسبات ژئوترموبارومتری دمای 600 تا 610 درجه سانتی گراد همراه با فشار 8 تا 10 کیلوبار را برای دگرگون شدن آن‌ها نشان می‌دهد که منطبق بر رخساره آمفیبولیت زیرین می‌باشد. غنی‌شدگی جزئی عناصر LREE نسبت به HREE و عدم تهی شدگی نمونه‌ها از HREE، مقادیرYbN بزرگ‌تر از 10 (متوسط 70/12) همراه با ماهیت قلیایی ماگمای اولیه، نشانگر ماهیت پوسته‌ای فاقد گارنت درون صفحه‌ای برای گنیس‌های مورد مطالعه می‌باشد. ضمن اینکه فرآیندهای دگرگونی به آن‌ها ماهیت گنیس بخشیده ولی آثار ویژگی‌های سنگ آذرین اولیه قابل تشخیص است. این جایگاه با محیط کششی کافتی حاکم بر بخش جنوبی زون سنندج-سیرجان در پالئوزوئیک زیرین در مراحل آغازین تشکیل و گسترش تتیس کهن سازگار است.
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