پتروگرافی و ژئوشیمی نهشته های سیلیسی آواری برش آرک (پالئوسن فوقانی- ائوسن زیرین)، شمال غرب بیرجند، شاهدی بر جایگاه زمین ساختی و سنگ شناسی خاستگاه

نویسندگان

1 استادیار گروه زمین‌شناسی، دانشکده علوم، دانشگاه بیرجند، بیرجند، ایران

2 دانشجوی کارشناسی‌ارشد، گروه زمین‌شناسی، دانشکده علوم، دانشگاه بیرجند، بیرجند، ایران

3 دانشیار گروه زمین‌شناسی، دانشکده علوم، دانشگاه بیرجند، بیرجند، ایران

چکیده

برش آرک در شمال غرب بیرجند در زون ساختاری شرق ایران واقع شده­است. پتروگرافی و ژئوشیمی نهشته‌های سیلیسی­­آواری این برش به‌ منظور تعیین ترکیب سنگ­شناسی و جایگاه زمین­­ساختی ناحیه منشأ مورد مطالعه قرار گرفته­است. شواهد پتروگرافی نمونه­های ماسه­­سنگی از جمله انواع کوارتزهای تک­­بلور و چند­­بلور با خاموشی مستقیم و موجی، فراوانی خرده­‌سنگ‌های رسوبی و به مقدار کمتر خرده­سنگ­های دگرگونی و ولکانیکی و همچنین ترسیم نتایج آنالیز مودال این نمونه­ها بر روی نمودار­های تعیین­­کننده منشأ زمین­­ساختی نشان می‌دهد ماسه­‌سنگ‌های مطالعه شده حاصل حمل مجدد رسوبات، پس از برخورد و کوهزایی­اند. بر اساس بررسی ژئوشیمی عناصر اصلی نمونه­های شیلی نیز این رسوبات از سنگ­های آذرین منشأ گرفته و به جایگاه زمین­ساختی برخوردی تعلق دارند. زون زمین­درز سیستان بین دو بلوک قاره­ای لوت و افغان واقع شده­است. بر مبنای کار محققین قبلی، فرورانش پوسته اقیانوسی سیستان نقش مهمی را در تحول تکتونیکی منطقه داشته­است. مطالعات اخیر نشان می­دهد که بدلیل فرورانش به سمت غرب اقیانوس سیستان در کرتاسه پیشین تا میانی، گوشته فوقانی به زیر بلوک لوت رانده شده و برخورد بین بلوک افغان و لوت در طول زون زمین­درز سیستان احتمالا در کرتاسه فوقانی رخ داده­است. تلفیق داده­های فوق و مقایسه آن با تحول زمین­ساختی منطقه نشان می­دهد که نتایج این مطالعه می­تواند برای بازسازی جغرافیای­دیرینه منطقه مورد استفاده قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Petrography and Geochemistry of Arc section (Upper Paleocene-Lower Eocene) siliciclastic deposits, northwest of Birjand, evidence of provenance tectonic setting and Lithology

نویسندگان [English]

  • M. Mortazavi Mehrizi 1
  • F. Malekmohammadi faradenbe 2
  • M. R. Hayhat 3
1 Assist. Prof., Dept., of Geology, Faculty of Sciences, University of Birjand, Birjand, Iran
2 M. Sc., student. Dept., of Geology, Faculty of Sciences, University of Birjand, Birjand, Iran
3 Assoc. Prof., Dept., of Geology, Faculty of Sciences, University of Birjand, Birjand, Iran
چکیده [English]

The Arc Section in the northwest of Birjand is located in the eastern Iran structural zone. The petrography and geochemistry of siliciclastic deposits of this section have been studied in order to determine the lithology and tectonic setting of the source area. Petrographic evidence of sandstone samples, including types of monocrystalline and polycrystalline quartz with non undulose and undulose extinction, the abundance of sedimentary rock fragments and to a lesser extent metamorphic and volcanic lithics, as well as drawing results of the modal analysis of these samples on the tectonic provenance diagrams show that the studied sandstones are the result of recycled orogeny and post collision. Also, based on the geochemical analysis of the major elements of the shale samples, these sediments originate from igneous rocks and belong to the collision tectonic setting. The sistan suture zone is placed between two continental blocks of Lut and Afghan. According to most researchers, subduction of the oceanic crust has played a very important role in the tectonic evolution of this region. The recent studies show that due to the westward subduction of the Sistan Ocean in the Early to Middle Cretaceous, the upper mantle was pushed under the Lut block and the collision between the Lut and Afghan blocks along the Sistan collision zone probably occurred in the Upper Cretaceous. Combining above data and comparing it with the tectonic evolution of the region shows that the results of this study can be used to reconstruct the paleogeography of this area.

کلیدواژه‌ها [English]

  • Mineralogy
  • Major oxides
  • Collision setting
  • Upper Paleocene- Lower Eocene
  • Northwest of Birjand

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  • تاریخ دریافت: 28 شهریور 1401
  • تاریخ بازنگری: 23 بهمن 1401
  • تاریخ پذیرش: 22 اسفند 1401

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