Calcareous nannofossil assemblages of the Late Campanian- Early Maastrichtian form Gurpi Formation (Dezful embayment, SW Iran): Evidence of a climate cooling event

Document Type: Research Paper


Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran


A succession of Late Campanian- Early Maastrichtian is analyzed from Gurpi Formation with regard to the calcareous nannofossils. Correlation Matrix was applied for the first time to the entire nannofossil assemblage to reconstruct environmental conditions. A detailed quantitative calcareous nannofossil analyses is performed on samples in order to further investigate the climate events, and interpret changes of surface water temperature. The calcareous nannofossil assemblage is divided into 3 groups as cold, cool and warm water taxa. Although cold water taxa (Ahmuellerella octoradiata and Gartnerago segmentatum) are rare (less than 1%), cool (Eiffellithus turriseiffelii, Prediscosphaera cretacea, Micula staurophora, Zeugrhabdotus spp., Arkhangelskiella cymbiformis, Biscutum constans, Tranolithus orionatus and Lucianorhabdus cayeuxii) and warm (Watznaueria barnesae, Uniplanarius trifidus, Uniplanarius sissinghii, Ceratolithoides spp. and Broinsonia spp.) water taxa are more frequent. The number of warm water taxa is higher than the number of cool water taxa and a reverse trend can be observed between them. Concerning the temperature index (TI), four important trends of climate variability from warmer to cooler phases (two cooling phases and two warming phases) have been documented at the studied interval. According to the recorded data, two pronounced cooling event are observed at Late Campanian and Early Maastrichtian, respectively.


Article Title [Persian]

بررسی تجمع نانوفسیلهای آهکی کامپانین پسین – مایستریشتین پیشین در سازند گورپی (فروافتادگی دزفول، جنوب غرب ایران): ثبت شواهدی از حادثه سردشدگی

Author [Persian]

  • اعظم ماهانی پور
گروه زمین‌شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران
Abstract [Persian]

در مطالعه حاضر تجمع نانوفسیل‌های آهکی در توالی رسوبات کامپانین پسین – مایستریشتین پیشین در سازند گورپی مورد مطالعه قرار گرفته است. در این مطالعه برای اولین ماتریکس تطابقی برای بررسی تجمع نانوفسیلهای آهکی و بازسازی شرایط محیطی استفاده شد. تحلیل کمی تجمع نانوفسیلهای آهکی جهت بررسی حوادث آب و هوایی و تفسیر تغییرات درجه حرارت آبهای سطحی بر روی نمونه‌ها انجام شد. تجمع نانوفسیل‌های آهکی بر اساس درجه حرارت به سه گروه گونه‌های بسیار سرد، سرد و گرم تقسیم می‌شوند. اگرچه گونه‌های شاخص آبهای بسیار سرد (Ahmuellerella octoradiata  و Gartnerago segmentatum) نادر می‌باشند (کمتر از یک درصد)، اما گونه‌های شاخص آب سرد (Eiffellithus turriseiffelii، Prediscosphaera cretacea، Micula staurophora، Zeugrhabdotus spp.، Arkhangelskiella cymbiformis، Biscutum constans، Tranolithus orionatusو Lucianorhabdus cayeuxii) و گرم (Watznaueria barnesae، Uniplanarius trifidus، Uniplanarius sissinghii، Ceratolithoides spp. و Broinsonia spp.) بسیار رایج هستند. تعداد گونه‌های شاخص آب گرم بیش از تعداد گونه‌های آب سرد است و یک روند معکوس بین آنها دیده می‌شود. با در نظر گرفتن شاخص درجه حرارت (Temperature Index=TI)، چهار روند مهم نوسانات آب و هوایی، از درجه حرارت گرمتر به سمت فازهای سردتر (دو مرحله سردشدگی و دو مرحله گرم‌شدگی) در محدوده مورد مطالعه ثبت شده است. بر طبق داده‌های ثبت شده، دو حادثه سردشدگی واضح به ترتیب در کامپانین پسین و مایستریشتین پیشین ثبت شده است.

Keywords [Persian]

  • کامپانین پسین
  • مایستریشتین پیشین
  • نانوفسیل‌های آهکی
  • حادثه سردشدگی
  • سازند گورپی
  • حوضه زاگرس
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