بررسی کانی‌شناسی و طیف‌سنجی پراش پرتوی ایکس رگه‌های گرافیتی در شمال_شرق توده الوند

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه بوعلی سینا همدان

2 دانشگاه بوعلی سینا

3 سازمان زمین شناسی و اکتشافات معدنی کشور

چکیده

منطقه مورد بررسی در 45 کیلومتری جنوب شرق همدان، در شمال شرق شهر ازندریان و شرق باتولیت الوند واقع شده است. گرافیت به دو صورت 1) رگه­هایی به ضخامت 5 تا cm 10 در کنار رگه­های کوارتزیتی دودی رنگ و 2) پراکنده در سنگ­های دربردارنده بلورهای درشت مسکوویت، کوارتز، گارنت، آندالوزیت، کیانیت و بیوتیت در منطقه دیده می­شود. سنگ میزبان گرافیت شیست­های میکادار هستند. مهمترین ناخالصی همراه با گرافیت در منطقه سرسیت و مسکویت هستند. در الگوی پراش پرتوی ایکس (XRD) از نمونه­ها، قله مربوط به گرافیت ششگوشی دیده شد. بررسی­های دماسنجی نشان می­دهد که 4 نوع سیال درگیر LCO2+VCO2+LH2O، LCO2+VCO2، VH2O+LH2O وLCO2+VH2O ، در رگه­های کوارتز وجود دارند. دمای همگن­شدگی برای سیال­های درگیر در همه نمونه­های دو فازی (در گستره 240-150) با میانگین C°180 و شوری­ها بین 3 تا 4/16 درصد وزنی معادل نمک طعام برپایه سامانه H2O-CO2-NaCl هستند. چگالی­های محاسبه شده برای سیال­های درگیر در کوارتز از 87/0 تاgr/cm3 1 متغیر است. افزون بر این، حضور CO2 در سیال­های درگیر نشانگر خاستگاه گرمابی رگه­های کوارتزیت موجود در ذخیره است. نتایج بررسی­های سنگ­نگاری و مشخصه­یابی فیزیکی کانی گرافیت بیانگر تشکیل این کانی از دگرگون شدن مواد آلی موجود در رسوب­های اولیه تا حد رخساره آمفیبولیت بوده و کانی­سازی گرافیت موجود در ذخیره در ارتباط مستقیم با تشکیل رگه گرمابی کوارتزی با خاستگاه دگرگونی است.

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogical and XRD studies of graphite veins in the northeast of Alvand Mountain

نویسندگان [English]

  • Mehrdad Barati 1
  • Arezoo Mohamadi 2
  • Mohamad Hazareh 3
  • Zinab Fallah Karimi 1
1 Bu Ali Sina University
2 Bu Ali Sina University
3 Geological and Mineral Exploration Organization of Iran
چکیده [English]

The study area is located about 45 km southeast of Hamedan, northeast of Azandarian city and east of Alvand batholith. Graphite is seen in two forms in the region: 1) in the form of graphite veins with 5 to 10 cm thickness, in contact with smoky quartzite veins, 2) Scattered in spotted graphite schist, containing large crystals of muscovite, quartz, garnet, andalusite, kyanite and biotite. In this region, the most important impurities associated with graphite are ​​sersite and muscovite. In the X-ray diffraction pattern (XRD), graphite peaks with hexagonal crystallization system were observed in the samples. Thermometric studies show that there are 4 types of fluid inclusions in quartz veins:1) LCO2 + VCO2 + LH2O 2) LCO2 + VCO2, 3) VH2O + LH2O and 4) LCO2 + VH2O. Homogenization temperature for the fluids inclusions in all two-phase samples (range between 240-150) is 180 ° C in average, and calculated salinity is between 3 to 16.4% by weight equivalent of NaCl according to H2O-CO2-NaCl system. In addition, presence of CO2 in the fluids inclusions indicates the hydrothermal origin of available quartzite veins. The results of petrographic and physical properties studies of graphite mineral indicate, the formation of this mineral from the metamorphic transformation of organic matter from initial sediments to amphibolite facies. The mineralization of graphite in this deposit is directly related to formation of quartz hydrothermal vein of origin.

کلیدواژه‌ها [English]

  • Azandaryan
  • the Alvand batholith
  • Graphite
  • fluids inclusion
  • XRD

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مجله بلورشناسی و کانی شناسی ایران
دوره 31، شماره 1 - شماره پیاپی 89
فروردین 1402
صفحه 123-134

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  • تاریخ دریافت: 18 خرداد 1401
  • تاریخ بازنگری: 31 مرداد 1401
  • تاریخ پذیرش: 27 شهریور 1401

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