بررسی فرکتال مرز دانه‌های کوارتز در گرانیت گنیس‌ آبادچی، شمال شهرکرد

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه شهرکرد

چکیده

توده گرانیت گنیس آبادچی در شمال دریاچه زاینده­رود، در پهنه ساختاری سنندج-سیرجان قرار دارد. این توده از نظر کانی شناسی، دارای کانی­های کوارتز، پلاژیوکلاز، فلدسپات پتاسیم، بیوتیت، آمفیبول، موسکویت، زیرکن، اسفن و آلانیت است. کوارتز یکی از فراوان­ترین کانی­های سازنده­ی این سنگ­هاست که از نظر بافتی شرایط متفاوت دگرشکلی دینامیکی وارد بر سنگ­های مورد بررسی را به خوبی نشان می‌دهد. بلورهای کوارتز شواهدی از باز تبلور کانی (BLG)، چرخش زیردانه­ای (SGR) و مهاجرت مرزدانه­ای (GBM) را نشان می­دهند. تغییر شکل بلورهای کوارتز وابسته به دما و نرخ کرنش است که توسط نمودار دما/ نرخ کرنش می­توان مقدار تغییر شکل را برآورد کرد. بطوری که، مقدار بعد فرکتال در مرز بلورهای کوارتز سنگ­های مورد بررسی بین 23/1 تا 11/1 و دما بین 400-250 تا 750-500 درجه سانتی­گراد است. براساس دما و بعد فرکتال محاسبه شده، نرخ کرنش برای چهار گستره اندازه­گیری  شده  بین 6/11- 10 تا 6/6- 10 است. نتایج بدست آمده از نمودارها با شواهد دگرشکلی بلورهای کوارتز (GBM, SGR ,BLG) همخوانی داشتند.    

کلیدواژه‌ها

عنوان مقاله [English]

Fractal analysis of quartz grain boundary in the gneissic granite of Abadchi, North of Shahrekord

نویسندگان [English]

  • Fariba Riyahi Samani
  • Nahid Shabanian Boroujeni
  • Alireza Davoudian Dehkordi
  • behnaz Bakhtiyari
چکیده [English]

The granitic gneisses of Abadchi village is located in the North of Zayandeh-Rud dam, where the area is a part of Sanandaj-Sirjan Zone. The mineralogical composition of the rocks is composed of quartz, plagioclase, K-feldspar, biotite, amphibole, muscovite, zircon, titanite and allanite. Quartz crystals, as the most abundant mineral constituents of these rocks, display the different conditions of deformation dynamic on the studied rocks according to their texture. Moreover, quartz crystals show evidence of bulging recrystallization (BLG), sub grain rotation (SGR) and grain boundary migration (GBM). The deformation of quartz crystals depends on the temperature and strain-rate that by using T/strain- rate diagram can determine the deformation conditions. Therefore, the fractal dimension at quartz grain boundary is between 1.23 and 1.11 and temperatures between 250-400 °C and 500 -750 °C in the granitic gneisses. Using fractal dimension and calculation of temperature, the strain rates are measured 10-11.6 to 10-6.6for the four domain of granitic gneiss sample. The results obtained from the diagram are consistent with the deformation evidence of quartz crystals (GBM, SGR, BLG).

کلیدواژه‌ها [English]

  • Quartz grain sutures
  • fractal
  • strain-rate
  • deformation
  • Abadchi
  • Sanandaj-Sirjan Zone

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  • تاریخ دریافت: 05 خرداد 1397
  • تاریخ بازنگری: 13 شهریور 1397
  • تاریخ پذیرش: 16 مهر 1397

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