Planktonic Foraminifera of the Dariyan formation and implications of Oceanic Anoxic Event 1a

Document Type : Research Paper


1 Exploration Directorate of the National Iranian Oil Company, Tehran, Iran

2 Department of Geology, Faculty of Science, University of Isfahan, Iran

3 Department of Geology, Faculty of Earth Sciences, Shahid beheshti University, Tehran, Iran


The investigated section cropping out in Kuh-e-Banesh, Zagros basin (southern Iran) is represented by limestone, Cherty beds and marl
levels bearing abundant Planktonic foraminifers, radiolarian microfaunas, and ammonite imprints. For the first time, well to moderately
preserved forms of Planktonic foraminifera have been extracted from black shale and marls levels. Extracted biota was studied with
regard to relationship with abundances of radiolarian and total organic carbon. Rock Eval analysis shows high total organic carbon
content within Daryian Formation (lower part). The presence of high abundances of planktonic foraminifers and radiolarian associated
with high total organic carbon content in the lower part of the Dariyan Formation suggest a high productivity event, eutrophication,
and warming phenomena of the ocean during early Cretaceous. Biostratigraphical ranges of planktonic foraminifera in the studied
section indicate Early Aptian to early Late Aptian age. It is, therefore, implicated that the oceanic anoxic event 1a (OAE 1a) interval be
regarded as equivalent levels in Tethys domains. The black shale of oceanic anoxic event is characterized by the widespread existence
of regionally organic-rich beds in the Tethys basins. Micro-paleontological and geochemical results provide new insights into the
paleogeography of the Tethys realm and better correlation with well-studied worldwide successions.


Article Title [Persian]

فرامینیفر های پلانکتونیک کرتاسه زیرین در حنوب ایران: نفوذ حادثه بی هوازی اقیانوسی بر حاشیه شمال شرقی تتیس

Authors [Persian]

  • مظاهر یاوری 1
  • مهدی یزدی 2
  • هرمز قلاوند 1
  • محمد حسین آدابی 3
1 شرکت ملی نفت ایران
2 گروه زمین شناسی
3 دانشگاه شهید بهشتی
Abstract [Persian]

مقطع مورد مطالعه در جنوب ایران، کوه بانش رخنمون دارد و شامل آهک، مارن و لایه چرتی همراه با فرامینیفر های پلانکتونیک، رادیولاریا و آمونیت می باشد. برای اولین بار به صورت سیستماتیک فرمهای آزاد فرامیینفرهای پلانکتونیک از شیل های تیره و مارن ها ی داریان زیرین استخراج و مطالعه گردید. بیو استراتیگرافی فرامینیفرهای پلانکتونیک در مقطع مورد مطالعه سن آپسین زیرین- ابتدای آپسین بالایی را نشان می دهد. این زمان معادل زمانی حادثه بی هوازی اقیانوسی در حوضه های تتیس است .
حادثه بی هوازی اقیانوسی بطور گسترده ای با مواد آلی بالا مشخص می گردد. نتایج آنالیزهای ژئوشیمیایی در ناحیه مورد مطالعه در بخش زیرین سازند داریان کربن آلی بالایی را نشان میدهد. فراوانی فرامینیفر های پلانکتونیک، رادیولر ها و کربن آلی بالا در بخش داریان زیرین بیانگرمواد غذایی بالا و گرم شدگی اقیانوسی در زمان کرتاسه زیرین است. با توحه به سن توالی مورد مطالعه، کربن آلی بالا و فراوانی فرامینیفرهای پلانکتونیک در شیل های تیره بیانگر حادثه بی هوازی اقیانوسی در ناحیه است . نتایج فسیل شناسی و ژئوشیمیایی ناحیه موردمطالعه یک دیدگاه جدیدی را برای پالئوژئوگرافی حوضه تتیس و توالی های جهانی مطالعه شده فراهم می کند.

Keywords [Persian]

  • فرامینیفر های پلانکتونیک
  • آپتین
  • ایران
  • سازند داریان
  • میزان کل کربن آلی
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