زمین شیمی و پتروژنز توده گرانیتوئیدی و اسکارن آهن علم‌ کندی (باختر ماه نشان، استان زنجان)

زمین شناسی اقتصادی

دوره 13، شماره 3 - شماره پیاپی 30، 1400، صفحه 507-536  

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v13i3.86285

نویسندگان

فرزانه نوری؛ میر علی اصغر مختاری ؛ جواد ایزدیار؛ حسین کوهستانی

گروه زمین‌شناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران

چکیده

کانسار آهن علم ­کندی در 35 کیلومتری باختر ماه­ نشان واقع‌شده و بخشی از زیرپهنه تکاب- تخت‌سلیمان در مجاورت با کمان ماگمایی ارومیه- دختر است. در این منطقه، واحدهای سنگی شامل تناوب آمفیبولیت، آمفیبول شیست و بیوتیت شیست با میان­ لایه­ هایی از مرمر مربوط به پالئوزوئیک توسط توده گرانیتوئیدی علم ­کندی به سن الیگوسن بالایی مورد هجوم قرار‌گرفته و هاله دگرگونی مجاورتی و کانه­ زایی آهن در آنها تشکیل‌ شده ‌است. توده گرانیتوئیدی شامل گرانودیوریت، کوارتز دیوریت و دیوریت پورفیری بوده و دارای ماهیت کالک­ آلکالن تا کالک­ آلکالن پتاسیم‌بالا و متعلق به گرانیتوئیدهای متاآلومینوس نوع I است. این توده مربوط به محیط حاشیه فعال قاره ­ای است. هاله دگرگونی مجاورتی متشکل از زیرپهنه ­های گارنت اسکارن، پیروکسن اسکارن، اپیدوت-پیروکسن اسکارن، سرپانتین اسکارن و اسکارن کانه ­دار است. مگنتیت کانی اصلی کانسار با کانی ­های پیریت و کالکوپیریت همراهی می­ شود. شواهد بافتی سنگ­ های دگرگونی مجاورتی نشان‌دهنده تشکیل هم ­زمان الیوین، گارنت و کلینوپیروکسن در محدوده دمایی 430 تا 550 درجه سانتی‌ گراد و ^22-10- ^18-10 ƒO₂=است.

کلیدواژه‌ها

زمین شیمی؛ گرانیتوئید؛ اسکارن آهن؛ تکاب-تخت سلیمان؛ علم کندی؛ ماه نشان؛ زنجان

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