کانی شناسی و ژئوشیمی گنیس‌های کمپلکس گل‌گوهر، جنوب استان کرمان
محورهای موضوعی :
حسین فاتحی
1
(علوم)
کلید واژه: گنیس# کمپلکس گل‌گوهر# استان کرمان# زون سنندج-سیرجان#,
چکیده مقاله :
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.
Gneisses from Gol-e-Gohar metamorphic complex in the south Kerman province and in the south-east of the Sanandaj-Sirjan metamorphic zone with granitoid protolith represent the green schist to lower amphibolite facies as a result of early Cimmerian orogenic phase. The studied gneisses are composed of potassium feldspar, plagioclase, biotite, quartz and garnet as main mineralogical composition. In addition, apatite, ilmenite, titanite, chlorite and muscovite are accessory phases in gneisses. Geothermobarometric calculations estimate a temperature of 600 to 610°C, with a pressure of 8 to 10Kbar. This is in accordance with the lower amphibole facies. The partial enrichment of the LREE relative to HREE and the lack of depletion in HREE of the samples, the values of YbN greater than 10 (average 12.70), combined with the alkali nature of the primary magma, indicate an intra-plate garnet-free crustal source for the gneisses. In addition, the metamorphic processes gave them gneissic nature, however, features of the primary igneous rock are recognizable. This situation is consistent with the extensional rifting environment developed in the southern part of the Sanandaj-Sirjan zone in the lower Paleozoic era in the early stages of the Paleo-Tethys formation.
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