دوره 29، شماره 1 - ( 1-1400 )
جلد 29 شماره 1 صفحات 62-49 |
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زیبا خدائیان چگنی1 
، نعمت ا. . رشیدنژاد عمران* 1، علی اکبر بهاری‌فر2 ، کارملا واکارو3 ، آیدا ماریا کونته4
، نعمت ا. . رشیدنژاد عمران* 1، علی اکبر بهاری‌فر2 ، کارملا واکارو3 ، آیدا ماریا کونته4
1- گروه زمین شناسی، دانشگاه تربیت مدرس، تهران
2- گروه زمین شناسی، دانشگاه پیام نور، تهران
3- دانشکده فیزیک و علوم زمین، دانشگاه فرارا، فرارا، ایتالیا
4- دانشکده علوم زمین، دانشگاه ساپینزا، رم، ایتالیا
2- گروه زمین شناسی، دانشگاه پیام نور، تهران
3- دانشکده فیزیک و علوم زمین، دانشگاه فرارا، فرارا، ایتالیا
4- دانشکده علوم زمین، دانشگاه ساپینزا، رم، ایتالیا
چکیده: (1465 مشاهده)
گارنت کالک سیلیکاتهای بابانظر در شمال شرق تکاب، پهنه سنندج- سیرجان، واقع هستند. از ویژگیهای بارز این کالک سیلیکاتها، وجودگارنت‌های بی‌شکل تا شکل‌دار و به رنگ سبز است. بررسی شیمی کانی نشان می‌دهد که این گارنت‌ها از نوع آندرادیت- گروسولار هستند و تا بیش از 13 درصد یووارویت دارند. مقدار بالای کروم در گارنت، حضور کروم اسپینل که دارای هسته غنی از کروم نسبت به حاشیه است و کانی‌های کدر سولفیدی چون پیریت و کالکوپیریت در این واحد کالک سیلیکاتها شواهدی از سنگ مادر فرامافیک هستند که می‌تواند منبع کروم برای گارنت باشد. شباهت ترکیب زمین شیمیایی این گارنت کالک سیلیکاتهای با سنگ‌های فرامافیک نیز با سنگ مادر فرامافیک سازگار است. این سنگ‌ها دستخوش دگرسانی گرمابی شدهاند که موجب بالا رفتن مقدارCa و پایین آمدن مقدار Mg درگارنت و سنگ میزبان در مقایسه با گارنت‌های گوشته‌ای و سنگ‌های فرامافیک شده‌است. ورود سیال های غنی از CO2 موجب کربناتیتی شدن سنگ مادر فرامافیک و خروج ترجیحی Mg می‌شود. گسل‌ها به عنوان کانال‌هایی برای چرخش سیال های گرمابی نقش کلیدی در فرایند دگرسانی گرمابی دارند.
واژه‌های کلیدی: گارنت، یووارویت، بابانظر، تخت سلیمان، تکاب.
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