تعیین برخاستگاه زمین‌ساختی و هوازدگی سنگ منشأ ماسه‌سنگ‌های سازند داهو (کامبرین پیشین) به روش‌های پتروگرافی و ژئوشیمی عناصر اصلی در برش ابیانه غرب نطنز

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشگاه خوارزمی، دانشکده علوم زمین، گروه زمین‌شناسی

چکیده

در این پژوهش، ویژگی‌های سنگ‌شناختی و ژئوشیمیایی عناصر اصلی ماسه‌سنگ‌های سازند داهو با سن کامبرین پیشین، به‌منظور مشخص کردن خاستگاه، جایگاه زمین‌ساختی و شرایط هوازدگی پیشین، در برش ابیانه واقع در غرب نطنز، در پهنه ایران‌ مرکزی، بررسی شدند. بر اساس مطالعات پتروگرافی، ماسه‌سنگ‌های منطقه، دانه‌ریز تا دانه‌درشت با جورشدگی متوسط تا خوب هستند. ترکیب کلی این ماسه‌سنگ‌ها از نوع لیت‌آرنایت، کوارتز‌آرنایت و تعداد کمی از آن‌ها ساب­لیت‌آرنایت و فلدسپاتیک لیت‌آرنایت تشخیص داده شد. مقایسه عناصر اصلی با میانگین پوسته قاره‌ای بالایی مشخص کرد که تقریبا تمام عناصر (به‌جز CaO و MnO) نسبت به پوسته قاره‌ای بالایی به میزان قابل­توجهی تهی شده‌اند. داده‌های ژئوشیمیایی در دیاگرام‌های تفکیک‌کننده محیط‌های زمین‌ساختی بیانگر رسوب‌گذاری ماسه‌سنگ‌ها در بخش‌ حاشیه قاره‌ای فعال است. ضریب بالای هوازدگی شیمیایی (CWI=93)، شرایط آب‌وهوایی گرم و مرطوب را در منطقه منشأ نشان می‌دهد.

کلیدواژه‌ها


عنوان مقاله [English]

Determining provenance and paleo-weathering conditions of Dahu Formation (lower Cambrian) sandstones by petrography and major elements geochemistry methods in Abyaneh section, Natanz west

نویسندگان [English]

  • neda Rezaee
  • khalil rezaei
  • F Fayazi
چکیده [English]

In this study, petrological and geochemical characterizes of major elements of the Dahu Formation sandstones (lower Cambrian) in Abyaneh section which in west of Natanz, Central Iran have been investigated to specify the origin, tectonic setting and paleoweathering condition. According to petrological studies, sandstones in this region are fine to coarse grained with intermediate to good sorting. Generally these sandstones are identified as litharenite, sub-litharenite, quartz-arenite and partially pheldesphtic litharenite. By comparing major elements with UCC shows that all elements (except CaO and MnO) have depleted with respect to upper continental crust (UCC). Geochemical data in tectonic setting discernment diagrams show that sandstones were deposited in active continental margin mainly. High value (93) of chemical weathering index (CWI) suggests an intermediate igneous source rocks with wet and warm condition.

کلیدواژه‌ها [English]

  • Provenance
  • Geochemistry
  • Sandstone
  • Parent rock
  • Dahu Formation
  • Abyaneh

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