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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 اصل مقاله (6.86 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22067/econg.v13i3.86285 | ||
نویسندگان | ||
فرزانه نوری؛ میر علی اصغر مختاری ![]() ![]() ![]() | ||
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 | ||
مراجع | ||
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