بررسی ویژگی‌های زمین‌شیمیایی متاپلیت‌های منطقه گل‌گهر در گستره کانسار آهن گل‌گهر، جنوب‌غرب سیرجان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه سیستان و بلوچستان

2 دانشگاه تهران

چکیده

مجموعه دگرگونی گل­گهر در 55 کیلومتری جنوب­غرب سیرجان و بخش شرقی پهنه سنندج- سیرجان قرار دارد. سنگ­های موجود در منطقه، در رخساره­های شیست سبز و آمفیبولیت بالایی با سن ژوراسیک میانی دگرگون شده مجموعه­ای از سنگ­های متاپلیتی (میکاشیست و گنیس)، متابازیتی، متاکربناتی را تشکیل داده­اند. بررسی­های زمین­شیمیایی نشان می­دهند که رسوبات اولیه متاپلیت­ها، شیل­ها و ماسه­سنگ­هایی جورنشده­ای هستند که اغلب از مواد خاستگاه با ترکیب اسیدی تا حدواسط تشکیل شده­اند. ناحیه خاستگاه، هوازدگی شیمیایی ضعیف تا متوسط را نشان می­دهد. مقدار نسبتاً کم کرم با میانگین  ppm67/99 و نیکل با میانگین ppm 56 در شیست­های مورد بررسی، با تراکم این عناصر در شیست­های پس از آرکئن همخوانی دارند گنیس­های منطقه گل­گهر نشان می­دهد که این سنگ­ها ترکیب رسوبی دارند (پاراگنیس) و از سنگ­های فقیر از آلومینیوم به دست آمده­اند.     

کلیدواژه‌ها

عنوان مقاله [English]

Study of the geochemical characteristics of metapelites in the Gol-Gohar area within the Gol-Gohar iron deposit district, SW Sirjan

نویسندگان [English]

  • rezvan Mirzaei Rayeni 1
  • Ali Ahmadi 1
  • Hassan Mirnejad 2
  • Mohammad boomeri 1
1 University of Sistan  Baluchestan
2 University of Tehran
چکیده [English]

The Gol-Gohar metamorphic complex is located about 55 km southwest of the Sirjan and is part of east Sanandaj-Sirjan zone. The rocks units are metamorphosed in greenschist and upper amphibolite facies with age of Middle Jurassic which consists of metapelitic (mica-schists and gneisses), metabasitic and metacarbonatic rocks. Geochemical studies indicate that the precursor sediments of the metapelites had been deposited as immature shales and grywackes from source materials of dominantly felsic to intermediate composition. Source area exhibited weak to moderate chemical weathering. The relatively low contents of Cr (average 99.67 ppm) and Ni (average 56 ppm) in the studied schists are comparable with the concentration of these elements in post-Archean schists. Study of gneisses in the Gol-Gohar area indicates that these rocks are sedimentary in composition (para gneiss) and were derived from rocks with weakly peraluminous.

کلیدواژه‌ها [English]

  • Geochemistry
  • Gol-Gohar
  • metapelites
  • Sanandaj-Sirjan Zone

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  • تاریخ دریافت: 07 مرداد 1396
  • تاریخ بازنگری: 08 آبان 1396
  • تاریخ پذیرش: 11 آذر 1396

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