First record of Gyroconulina columellifera Schroeder & Darmoian, 1977 (larger benthic foraminifera) from the Maastrichtian Tarbur Formation of SW Iran (Zagros Fold-Thrust-Belt)

Document Type : Research Paper


1 Independent Researcher , Munich ,Germany

2 Department of Geology, Payame Noor University, Po Box 19395-3697 Tehran, Iran


The larger benthic foraminifera Gyroconulina columellifera Schroeder & Darmoian, 1977 (type-locality: Maastrichtian Aqra Formation of Iraq) is described for the first time from two sections of the Maastrichtian Tarbur Formation of the Zagros Fold-Thrust-Belt, SW Iran. New details on its wall microstructure are provided. The microfacies is represented by bioclastic wacke-/pack-/grainstones with benthic foraminifera (e.g., Loftusia ssp., Neobalkhania bignoti, Omphalocyclus macroporus) and dasycladalean algae. The Iranian discoveries give further evidence for the biostratigraphic importance of the taxon. The biostratigraphy of the Tarbur Formation based on larger benthic foraminifera is reviewed and critically discussed. Both Gyroconulina columellifera Schroeder & Darmoian, and the dasycladale Pseudocymopolia anadyomenea (Elliott), which have been first described from the Maastrichtian of Iraq, are now also reported from the Tarbur Formation of Iran. Their restricted occurrences along the southeastern northern margin of the Arabian plate and the Taurides of Turkey (Anatolian plate) are indicative for a Late Cretaceous provincialism, partly coinciding with the larger Loftusia bioprovince.


Article Title [فارسی]

اولین گزارش از Gyroconulina columellifera فرامینیفر کفزی Schroeder & Darmoian, 1977 بزرگ مائستریشتین، سازند تاربور در جنوب غرب ایران (زاگرس چینخورده و رورانده)

Authors [فارسی]

  • فلیکس اشلاگینویت 1
  • کوروش رشیدی 2
  • فرزانه بارانی 2
Abstract [فارسی]

فرامینفر کف‌زی بزرگ Gyroconulina columellifera Schroeder & Darmoian, 1977 اولین بار از سازند تاربور در دو برش از نواحی زاگرس چین خورده و تراست زاگرس گزارش و توصف می‌شود (ناحیه تایپ: مائس‌تریشتین، سازند اقره، عراق). جزئیات جدیدی از ریز ساختار دیواره در اینجا توصیف شده است. ریزرخساره دربردارنده این فرامینیفر شامل بایوکلاست وکستون / پکستون/ گرینستون همراه با فرامینیفرهای بنتیک درشت (ازقبیل: Loftusia ssp. Neobalkhania bignoti, Omphalocyclus macroporus) و جلبک‌های داسی‌کلاداسه می‌باشد. بیواستراتیگرافی سازند تاربور براساس فرامینیفرهای کف‌زی بزرگ در مقالات متعددی مورد مطالعه قرار گرفته است که احتیاج به بازنگری دارد. فرامینیفر Gyroconulina columellifera Schroeder & Darmoian, و جلبک داسی‌کلاداسه Pseudocymopolia anadyomenea (Elliott) که هر دو اولین بار از مائس‌تریشتین عراق توصیف شده، اکنون در سازند تاربور ایران نیز گزارش می‌گردد. این فرامینیفر همراه با برخی از فرامینیفرهای کف‌زی بزرگ دیگر از قطر که توسط Henson  گزارش شده گسترش محدودی در حاشیه شمالی صفحه عربستان و جنوب شرقی تورید ترکیه (صفحه آناتولی) دارند و نشان دهنده یک ایالت محلی در کرتاسه پسین می‌باشد. این ایالت محلی تا حدودی منطبق بر ایالت زیستی لوفتوزیای درشت می‌باشد.

Keywords [فارسی]

  • : فرامینیفر کف‌زی
  • داسی‌کلاداسه: مائستریشتین
  • سازند تاربور
  • سازند اقره
  • بیواستراتیگرافی
  • بیوژئوگرافی
  • ایالت زیستی
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