تحلیل و بررسی سنگ نگاری و زمین شیمی دولومیت های پرمین در برش قره داغ، جنوب دریاچه ارومیه

نویسندگان

1 دانشیار گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه ارومیه، ارومیه، ایران

2 دانش‌آموخته‌ی گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه ارومیه، ارومیه، ایران

چکیده

در این مطالعه بخش دولومیتی نهشته­های پرمین در برش قره­داغ، واقع در جنوب دریاچه ارومیه از منظر سنگ­نگاری و زمین­شیمی مورد مطالعه و بررسی شده است. تعداد 92 نمونه از برش موردنظر که دارای ضخامت 202 متر می­باشد، جمع­آوری شد. مطالعات سنگ­نگاری به وسیله میکروسکوپ پلاریزان و مطالعات زمین­شیمی بر مبنای آنالیز عنصری به روش AAS صورت گرفته است. مطالعات سنگ­نگاری براساس طبقه­بندی بافتی، طبقه­بندی انجام گرفته و برمبنای آن دو گروه کلی دولومیت­های اولیه (هم­زمان با رسوب­گذاری) و دولومیت­های ثانویه (پس از رسوب‌گذاری) منجر به شناسایی شده است. دولومیت­های اولیه شامل دولومیکرایت­ها (خیلی ریزبلور) و دولومیت­های ثانویه شامل اسپارایت­ها و دولومیت­های پرکننده حفرات می­باشد. مطالعات زمین­شیمی بر مبنای عناصر اصلی Mg و Ca و عناصر فرعی Fe, Mn, Sr, Na صورت گرفته است. با تلفیق نتایج حاصل از مطالعات سنگ­نگاری و آنالیز عنصری، محیط تشکیل دولومیت­های مورد مطالعه مشخص گردید. دولومیکرایت­ها در محیط­های بالای کشندی، اسپارایت­ها در محیط تدفینی کم­عمق و دولومیت‌های پرکننده حفرات تحت شرایط تدفین عمیق و توسط سیالات دولومیتی­ساز تشکیل شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Analysis and investigation of petrography and geochemistry of Permian dolomites in Qaradagh section, south of Lake Urmia

نویسندگان [English]

  • A. Ciabeghodsi 1
  • Sh. Mehrabi 2
1 Assoc. Prof., Dept., of Geology, Faculty of Sciences, Urmia University, Urmia, Iran
2 (graduated), Dept., of Geology, Faculty of Sciences, Urmia University, Urmia, Iran
چکیده [English]

In this study, the dolomitic part of the Permian deposits in the Qaradagh section, located in the south of Lake Urmia, has been studied and investigated from the perspective of lithology and geochemistry. 92 samples were collected from the 202-meter-thick section. The petrographic studies were conducted by use of polarizing microscope, whereas the geochemical studies were accomplished using AAS method. The petrographic studies were carried out based on textural classification and based on that, two general groups of primary dolomites (at the same time as sedimentation) and secondary dolomites (after sedimentation) were identified. Primary dolomites include dolomicrites (very fine crystals) and secondary dolomites include sparites and dolomites filling holes. The geochemical studies are focused on main elements including Ca and Mg, and rare elements including Fe, Na, Si and Mn. Combining results from lithostratigraphic studies and elemental analysis, the formation environment of the studied dolomites concluded as follow: dolomicrites are deposited in supra-tidal to upper parts and inter-tidal zones, sparites are deposited in a shallow burial environment, and pore-filling dolomites are deposited in a deep burial environment by dolomitic fluids.

کلیدواژه‌ها [English]

  • Carbonate rocks
  • Petrography
  • Geochemical
  • Magnesium
  • Qaradagh

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  • تاریخ دریافت: 07 بهمن 1402
  • تاریخ بازنگری: 24 تیر 1403
  • تاریخ پذیرش: 27 تیر 1403

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