بررسی بایواستراتیگرافی و پالئواکولوژی سازند قم بر اساس میکروفسیل‌های شرق قم

نوع مقاله: مقاله پژوهشی

نویسنده

استادیار، گروه علوم، دانشگاه آزاد اسلامی، واحد قم، قم، ایران

چکیده

هدف این مقاله شناسایی روزن داران الیگو- میوسن سازند قم در برش دوبرادر و بررسی سن سازند قم و پالئواکولوژی این محدوده از مجموعه حوضه­هایی است که آبراهه طویل ایران مرکزی را در میان رشته کوه­های البرز و زاگرس به وجود می­آوردند. حاصل آخرین پیشروی دریا درروپلین تا میوسن تناوبی از آهک­هاى کم عمق و مارنی بوده که به طور مشخصى از نظر رنگ و لیتولوژى از سازند زیرین و فوقانی خود متمایز است و سازند قم خوانده می شوند، در منطقه مورد مطالعه ستبرای سازند 830 متر و متشکل از 8 بخش است که به طور کلی از تناوب سنگ آهک و مارن ساخته شده­اند. جهت انجام مطالعه­ای کامل و جامع از سازند قم در مقطع ذکر شده، تعداد زیادی نمونه جهت تهیه مقطع نازک و نمونه­های مارنی جهت مطالعه روزن داران ایزوله برداشت و بررسی شدند. نتایج مطالعات نشان می دهد که بدون شک رسوبات دریای ایران مرکزی طی روپلین تا یوردیگالین در اقلیمی گرم و یا نیمه گرم و در محیطی دریایی محدود ولی مرتبط با دریای آزاد، رسوبگذاری شده اند؛ دریایی که عمق آن در طول الیگو- میوسن همیشه در حال تغییر بوده است.

کلیدواژه‌ها


عنوان مقاله [English]

Biostratigraphy and paleoecology research on Qom Formation based on microfossils at East of the Qom

نویسنده [English]

  • k. Khaksar
Assistant Professor, Department of Sciences, Islamic Azad University, Qom Branch, Qom, Iran
چکیده [English]

This research has described for determinate of Oligo-Miocene Foraminifers at the Do Baradar section. The main aim project was scrutiny age of this Formation and Paleoecology distribution lot of basins have created with big streams between Zagros and Alborz with Central Iran.
Final transgressive sea on the Rupelian to Late Miocene have created the continue sediments consist low depth Lime stone and Marls. These sediments have complete different colors and lithology have named Lower Red Formation and Upper Red Formation and total Qom Formation. In this section the thickness of Qom Formation is 830 Meters that 8 units can separate of Marls and Limestone. From the Limestone have collected a lot of Samples and on Marls have samples isolate Foraminifers. The result of this research have been showing: The Central Iran Sediments on the Rupelian to Burdigalian have a warm climate (Tropical) to sub warm (Subtropical) climate with restrict marine environment but continue to open sea. The depth on Oligo-Miocene was different and have swing.

کلیدواژه‌ها [English]

  • Central Iran
  • Qom Formation
  • Foraminifers
  • Biostratigraphy
  • Paleoecology
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