ریزرخساره‌ها، محیط رسوبی و چینه‌نگاری سکانسی سازند آسماری در یال جنوبی تاقدیس کوه سیاه، شمال دهدشت، زاگرس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه اصفهان، اصفهان

2 دانشکده علوم زمین، دانشگاه صنعتی شاهرود، شاهرود

3 معاونت زمین‌شناسی، شرکت ملی مناطق نفت خیز جنوب، شرکت ملی نفت ایران، اهواز

چکیده

سازند آسماری در حوضه زاگرس طی الیگوسن-میوسن نهشته شده است. در این پژوهش جهت بررسی ریزرخساره­ها، محیط رسوبی و چینه­نگاری سکانسی این سازند در یال جنوبی تاقدیس کوه سیاه، (شمال دهدشت) 127 نمونه مورد مطالعه قرار گرفته است. سازند آسماری در برش مورد مطالعه 214 متر ضخامت داشته و متشکل از آهک­های ضخیم، متوسط تا نازک لایه با میان لایه­هایی از آهک مارنی، آهک دولومیتی و مارن می­باشد. مطالعات پتروگرافی و آنالیز ریزرخساره­ای حاکی از آن است که کربنات­های سازند آسماری متشکل از 11 ریزرخساره در قالب چهار کمربند ریزرخساره­ای دریای باز، سد، تالاب و پهنه جزرومدی در یک پلاتفرم کربناته رمپ نهشته شده است. بر طبق الگوهای عمیق و کم عمق شدگی ریزرخساره­ها یک بسته رسوبی فرازین به سن شاتین، سه سکانس درجه سه به سن آکیتانین و یک سکانس درجه سه به سن بوردیگالین تشخیص داده شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Microfacies, depositional environments and sequence stratigraphy of the Asmari Formation in Kuh-e Siah anticline north of Dehdasht, Zagros

نویسندگان [English]

  • Mojgan Zare 1
  • Hossain Vaziri-Moghaddam 1
  • Azizolah Taheri 2
  • Ali Ghabeishavi 3
چکیده [English]

The Asmari Formation deposited in the Zagros basin during the Oligocene-Miocene. In this study, microfacies, depositional environment and sequence stratigraphy of the Asmari Formation in Kooh-Siah anticline (north of Dehdasht) 127 sampels was studied. The thickness of the Asmari Formation in this section is 214m and consists of thick, medium and thin bedded limestones interbeded with marly limestone, dolomitic limestone and marl. Based on petrography and analysis of microfacies features,11 different microfacies types have been recognized,which can be grouped into 4 depositional environments:tidal flat, lagoon, shoal and open marine. The Asmari Formation represents sedimentation on a carbonate ramp. A HST in Chattian, three third-order depositional sequence in Aquitanian, and one third-order sequence in Burdigalian are recognized,on the basis of deepening and shallowing patterns in the microfacies.

کلیدواژه‌ها [English]

  • Oligocene-Miocene
  • Sequence Stratigraphy
  • Carbonate ramp
  • microfacies
  • Asmari Formation

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