تحلیل شرایط رسوبی مرز سازندهای پابده-آسماری در شمال باختر ایلام

نویسندگان

1 دانشجوی کارشناسی‌ارشد، گروه زمین‌شناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران

2 استادیار گروه زمین‌شناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران

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

چکیده

به منظور مطالعه زونهای زیستی و تعیین محیط­رسوبی توالی‌های مرتبط با مرز سازندهای پابده و آسماری، برش شیره چقاچالانچی در شمال باختر ایلام انتخاب شد. در طی مطالعات صحرایی، تعداد 25 نمونه سنگی از ستبرای 33 متر توالی‌های محدوده مرز این دو سازند برداشت گردید و به لحاظ محتوای فسیلی و رخساره­ای، مورد مطالعه دقیق فسیل­شناسی و رسوب­شناسی قرار گرفت. سازند پابده در این برش چینه­شناسی در برگیرنده توالی‌های نازک‌لایه سنگ‌آهکی با میان لایه‌های سنگ‌آهک رسی نازک‌لایه بوده که به تدریج به توالی‌های متوسط تا ضخیم‌لایه سنگ‌آهکی متعلق به سازند آسماری تبدیل می‌شود. مطالعات انجام شده بر روی محتوای فسیلی نمونه‌ها منجر به شناسایی تعداد 13 گونه متعلق به 26 جنس از روزنبران گردید. مطالعات فسیلی بر روی برش­های نازک میکروسکوپی منجر به تفکیک دو زیست‌زون تجمعی Globigerina spp. و Lepidocyclina-Operculina-Ditropa گردید که محدوده سنی روپلین- شاتین را برای توالی­های مورد مطالعه مشخص می­نماید. بر پـایه مطالعات میـکروسکوپی رخـساره‌ها، بافـت و اجـزای سـازنده، دو ‌رخـساره در برگیرنده 1) وکستون تا پکستون حاوی روزنبران پلانکتون و کف‌زی؛ 2) وکستون حاوی روزنبران پلانکتون مربوط به زیر محیط رسوبی رمپ بیرونی تفکیک و شناسایی شد. ویژگی‌های رسوبی، آرایش و بافت ذرات و مقایسه مشخصات رخساره‌های بدست آمده با توالی‌های بررسی شده در اطراف برش شیره چقاچالانچی، نشان می‌دهد که رسوب‌گذاری مرز بین سازندهای پابده و آسماری در یک محیط آرام و به دور از امواج توفانی در زیر محیط رمپ بیرونی انجام شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Sedimentary conditions of the Pabdeh-Asmari formations boundary in NW of the Ilam

نویسندگان [English]

  • M. Parsazad 1
  • J. Rabbani 2
  • A. Zohdi 3
1 M. Sc. student, Dept., of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
2 Assist. Prof., Dept., of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
3 Assoc. Prof., Dept., of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
چکیده [English]

In order to investigate the biostratigraphic zones and depositional environment of the Pabdeh-Asmari formations boundary, one stratigraphic section (Shirah-Choqachalanchi) has been sampled in the northwest of Ilam. Twenty-five samples were collected from thirty-three meters carbonate layers. All samples have been analyzed for their fossil content and facies characteristics. The Pabdeh Formation in this area consists of thin-bedded limestone with interbedded thin layers of argillaceous limestone, thickening-upward to the Asmari Formation. Fossil studies lead to identification of 13 species belonging to 26 genera of foraminifera that two biozones can be differentiated based on fossil index (Globigerina spp. zone And Lepidocyclina-Operculina-Ditrupa assemblages zone). Rupelian-Chattian age can be proposed for the studied sequences based on biozonation. Facies studies show two facies (1- planktonic and benthic foraminifera wackestone to packstone, and 2- planktonic foraminifera wackestone) related to the outer ramp depositional environment. Facies studies, grain texture and comparing the data obtained from this research with other sections of the region show that sedimentation occurred in a calm outer ramp environment, away from storm wave influence.

کلیدواژه‌ها [English]

  • Biostratigraphy
  • Facies
  • Pabdeh and Asmari formations
  • Ilam

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  • تاریخ دریافت: 11 اردیبهشت 1403
  • تاریخ بازنگری: 30 تیر 1403
  • تاریخ پذیرش: 31 مرداد 1403

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