نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

بررسی ریززمین‌ساختی و پتروفابریکی واحدهای ‌شیستی گرافیت‌دار در محدودۀ بندچرک، پهنۀ دگرگونی کوه-دم

نویسندگان
دانشگاه خوارزمی
چکیده
محدودۀ اکتشافی بند­چرک در پهنۀ ساختاری ایران مرکزی، شمال­‌شرقی شهرستان اردستان و در پهنۀ دگرگونی کوه­ دم واقع شده است. واحدهای شیستی میزبان گرافیت‌­زایی در مجموعۀ دگرگونی کوه دم، به سن پالئوزوئیک بالایی (پرمین- تریاس) بوده و شامل مسکوویت‌­شیست تا گرافیت- مسکوویت­‌شیست هستند. در محدودۀ مورد مطالعه، رخداد فعالیت­‌های تکتونیکی و دگرگونی ناحیه‌­ای با ایجاد دگرریختی در سطوح شیستوزیتۀ حاوی مواد آلی کربن­‌دار، فضاهای مناسبی را برای گرافیت­‌زایی و افزایش عیار کربن فراهم نموده است. سه فاز اصلی چین­‌خوردگی و دگرریختی، واحدهای شیستی را تحت‌­تأثیر قرار داده است. نسل اول چین‌­خوردگی (F1) و دگرریختی (D1با ایجاد برگوارگی (S1) به موازات لایه‌بندی اولیه (S0) و سطح محوری چین (AF1)، نقش مهمی را در تغلیظ کربن آلی تشکیل‌شده در حین رسوبگذاری و ایجاد گرافیت ایفا نموده است. دگرریختی نسل دوم (D2با نفوذ تودۀ دیوریتی و ایجاد تغییرات در شیب و امتداد لایه‌­های آهکی، شیستی و نیز مورفولوژی محدوده، همراه است. میلونیتی ­شدن واحدهای شیستی، از جمله مهم‌­ترین آثار این مرحله از دگرشکلی است. نسل سوم و پایانی دگرریختی (D3)، با اعمال فشار جهت‌دار، سبب ایجاد دگرریختی، عمدتاً به صورت شکنا شده است. ایجاد ساختار­های کینک‌­باند (در تناوب نوارهای کوارتز-فلدسپاتی و گرافیتی)، حاشیۀ مضرسی و دندان‌ه­ای (در بلورهای کوارتز و فلدسپار)، ساب­گرین‌­شدگی (در بلورهای کوارتز و فلدسپار)، خاموشی موجی در کوارتز، رشد مجدد بلورهای کوارتز و فلدسپار موجود در واحدهای مسکوویت­‌شیست و گرافیت-مسکوویت­‌شیست، از جمله شواهد رخداد این نسل از دگرریختی در محدوده است.
کلیدواژه‌ها

عنوان مقاله English

Microtectonic and petrofabric investigation of graphite-bearing schist units in the Band-e-Cherk district, Kuh-e-Dom metamorphic zone

نویسندگان English

Majid Ghasemi Siani
Hamed Ebrahimi Fard
Asghar Dolati
Kharazmi University
چکیده English

The Band-e-Cherk district is located in the structural zone of central Iran, northeast of the city of Ardestan, and the Kuh-e-Dom metamorphic zone. The schist units hosting graphitization in the Kuh-e-Dom metamorphic complex are of Upper Paleozoic (Permian-Triassic) age and include muscovite schist to graphite-muscovite schist. In the studied area, the occurrence of tectonic activities and regional metamorphism by creating deformations in the schistose surfaces containing carbonaceous organic materials, have provided suitable spaces for graphitization and increase in carbon content. Three principal phases of folding and deformation have affected the schist units. The first generation of folding (F1) and metamorphism (D1), by creating a foliation (S1) parallel to the primary bedding (S0) and the axial surface of the fold (AF1), has played an important role in the concentration of organic carbon formed during the deposition and formation of graphite. The second generation deformation (D2) is associated with the intrusion of the diorite body and variations in the dip and strike of the limestone and schist beds as well as the morphology of the district. The mylonitization of the schist units is one of the most important effects of this stage of deformation. The third and final generation of deformation (D3) has been the result of directional pressure, it has been the result of deformation, mainly in brittle form. The formation of kink band structures (in quartz-feldspar and graphite bands), jagged and dendritic edges (in quartz and feldspar crystals), subgraining (in quartz and feldspar crystals), undulose extinction in quartz, recrystallization of quartz and feldspar crystals in the muscovite schist and graphite-muscovite schist units are among the evidences of this generation of deformation in the district.

کلیدواژه‌ها English

microtectonic
structural analysis
schistosity surfaces
graphitization
ductile deformation
Kuh-e-Dom metamorphic zone
Band-e-Cherk district
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