زمین‌شیمی و محیط زمین‌ساختی گرانیت گنایس‌های آبادچی، شمال شهرکرد

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه شهرکرد

چکیده

توده­ی گرانیت گنایس­ منطقه آبادچی (مجاور سد زاینده‌رود) بخشی از پهنه زمین­ساختی سنندج - سیرجان است. ترکیب کانی‌شناسی این توده‌های گرانیت گنایسی شامل کوارتز، فلدسپات پتاسیم، پلاژیوکلاز، بیوتیت و موسکویت و کانی­های فرعی کدر، زیرکن، آمفیبول و آلانیت است. سنگ‌های گرانیت گنایسی­ مورد بررسی­ تحت تاثیر دگرشکلی دینامیک و دگرنهادی ضعیف سدیمی واقع شده­اند. این سنگ­ها از نظر زمین­شیمی کلسیمی تا آهکی- قلیایی، آهن­دار تا منیزیم­دار، پرآلومین تا کمی متاآلومین و از نوع A تا I هستند. نمودار  REEبهنجارشده به کندریت غنی­شدگیLREE ها را نسبت به HREEها همراه با ناهنجاری منفی Eu نشان می­دهند. این سنگ­ها در نمودارهای عنکبوتی بهنجار شده نسبت به مانتوی اولیه غنی­شدگی نسبی در LILE  وLREE  نسبت به HFSE  را نشان می­دهند که این امر اشاره به سنگ­های ماگمایی وابسته به کمان و محیط­های برخوردی دارد. این گرانیت گنایس در جایگاه زمین­ساختی  پس از برخورد تشکیل شده­اند.    

کلیدواژه‌ها

عنوان مقاله [English]

Geochemistry and tectonic setting of granite-gneisses from Abadchi, north of Shahrekord

نویسندگان [English]

  • Riyahi Samani
  • Shabanian Boroujeni
  • Davoudian Dehkordi
چکیده [English]

The granite-gneiss body of  Abadchi area (vicinity of Zayandeh-Rud dam) is a part of Sanandaj-Sirjan tectonic zone. The mineralogical composition of the granite- gneisses contains quartz, K-feldspar, plagioclase, biotite and muscovite and minor minerals of opaque, zircon, amphibole and allanite. The granite-gneiss rocks have been influenced by deformation dynamics and weakly Na-metazomatism. Geochemically, these rocks are calcic to calc-alkali, ferroan to magnesian, peraluminous to slightly metaluminous and are A to I-type granitoid. On the bases of chondrite-normalized REE diagram, they show a relatively enrichment in LREES rather than HREES with negative Eu anomalies. On primitive-mantle normalized spider diagrams, the rocks display relatively enrichment in LILE and LREE rather than HFSE which represent the magmatic rocks depending on arc and collision setting. This granite-gneiss is formed in post-collisional tectonic setting.

کلیدواژه‌ها [English]

  • granite-gneiss
  • A-type granite
  • Geochemistry
  • Abadchi
  • Sanandaj-Sirjan Zone

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مجله بلورشناسی و کانی شناسی ایران
دوره 26، شماره 1 - شماره پیاپی 69
فروردین 1397
صفحه 195-208

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  • تاریخ دریافت: 23 فروردین 1396
  • تاریخ بازنگری: 08 تیر 1396
  • تاریخ پذیرش: 07 مرداد 1396

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