نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

کانی‌شناسی شیست‌های گرافیت‌دار و تخمین دمای گرافیتی‌شدن در محدودۀ بندچرک، پهنۀ فلززایی انارک

نویسندگان
1 دانشگاه خوارزمی
2 فولاد مبارکه اصفهان
3 البرز، کرج، مرکز تحقیقات فرآوری مواد معدنی ایران
چکیده
منطقۀ اکتشافی بند­چرک در پهنۀ ساختاری ایران مرکزی، شمال­‌شرقی شهرستان اردستان و در پهنۀ فلززایی انارک واقع شده است. واحدهای سنگی رخنمون­‌یافته در این محدوده، شامل مجموعۀ دگرگونی شیستی و سنگ­‌آهک­ تبلور مجدد­یافتۀ کوه­ دم، رسوبات آهکی کرتاسه، کنگلومرای پالئوسن و سنگ­های آتشفشانی با ترکیب آندزیت، آندزیت- بازالت، تراکیت و توف به سن ائوسن و توده نفوذی دیوریتی است. مجموعۀ دگرگونی کوه­ دم به سن پالئوزوئیک زیرین بوده و شامل مسکوویت­‌شیست تا گرافیت- مسکوویت­‌شیست، اپیدوت- هورنبلند- کالک­‌شیست، مسکوویت- کلریت­‌شیست، کالک­‌شیست، آهک بلورین و مرمر هستند. کانه‌­زایی گرافیت به صورت آمورف در امتداد سطوح شیستوزیتۀ واحدهای گرافیت- مسکوویت­‌شیست متمرکز شده و کانی‌­های کوارتز، کائولینیت، ایلیت، مسکوویت (سریسیت)، ارتوکلاز و دیکیت کانی­‌های دیگر هستند. مقایسۀ بین محدودۀ دمایی تشکیل گرافیت­‌های پرعیار صفحه­‌ای (پولکی) که در دماهای بالاتر از 450 درجه سانتی‌گراد به ­خصوص در دماهای بین 470 تا 560 درجه سانتیگراد (در حد رخساره آمفیبولیت) ایجاد می‌­شوند، با دمای به دست‌­آمده از طریق تفسیر نتایج طیف­‌سنجی رامان بر روی نمونه‌­های گرافیت­‌دار پُرعیار محدودۀ بند­چرک، نشان­‌دهندۀ این موضوع است که گرافیتی‌­شدن در محدودۀ بند­چرک از نوع نامنظم و آمورف بوده و در دمای پایین­تر از 450 درجه سانتی‌گراد (436 درجۀ سانتی­گراد) و در شرایط دمایی مربوط به رخسارۀ دگرگونی شیست سبز تشکیل شده است
کلیدواژه‌ها

عنوان مقاله English

Mineralogy of graphite-bearing schists and calculation of graphitization temperature in the Band-e-Cherk district, Anarak metallogenic zone

نویسندگان English

Majid Ghasemi Siani 1
Hamed Ebrahimi Fard 1
Amir Hossein Heidari 2
Behrouz Karimi Shahraki 3
Shahryar Mahmoudi 1
1 Kharazmi University
2 Isfahan’s Mobarakeh Steel Company
3 Iranian Mineral Processing Research Center
چکیده English

The Band-e-Cherk exploration area is located in the structural zone of central Iran, northeast of the city of Ardestan, and the Anarak metallogenic zone. The outcropping rock units in this area include Kuh-e-Dom metamorphic schist complex and recrystallized limestone, Cretaceous limestone sediments, Paleocene conglomerate, Eocene volcanic rocks composed of andesite, andesite-basalt, trachyte, as well as tuff and diorite intrusions. The Kuh-e-Dom metamorphic complex is of lower Paleozoic age, and includes muscovite schist to graphite-muscovite schist, epidote-hornblende-calc schist, muscovite-chlorite schist, calc schist, crystalline limestone and marble. Graphite mineralization is concentrated along the schistose surfaces of graphite-muscovite schist units, and quartz, kaolinite, illite, muscovite (sericite), orthoclase and dickite minerals are other minerals. Comparison of the temperature range for the formation of high-quality flake graphite, which is formed at temperatures above 450°C, mainly between 470 and 560°C (in the amphibolite facies), with the temperature obtained by interpreting the results of Raman spectroscopy on high-quality graphite-bearing samples from the Band-e-Cherk area, shows that graphitization in the Band-e-Cherk area is of an amorphous type and at a temperature lower than 450°C (436°C). Therefore, it was formed under the temperature conditions associated with the greenschist metamorphic facies.

کلیدواژه‌ها English

Amorphous graphite
graphitization
graphite-bearing schists
Band-e-Cherk
Kuh-e-Dom metamorphic complex
Anarak metallogenic zone
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