ثبت شرایط آب و هوایی بارمین بر اساس تجمع نانوفسیل‌های آهکی در سازند گرو (برش قلعه‌دره)

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه زمین شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران.

چکیده

چکیده
در مطالعه حاضر رسوبات بارمین در سازند گرو در یال جنوب غربی تاقدیس کبیرکوه (برش قلعه‌دره) از نقطه نظر نانوفسیل‌های آهکی مورد بررسی قرار گرفت. در رسوبات تحت بررسی سه حادثه نانوفسیلی شاخص ثبت شد و بر اساس آن‌ها بیوزون NC5 و قسمتهای ابتدایی بیوزونNC6 و زیرزون‌های NC5c، NC5d و NC5e از زوناسیون روث (Roth, 1978) و بیوزون‌های CC5 ، CC6 و CC7 از زوناسیون سیسینگ (Sissingh, 1977) تشخیص داده شد. در محدوده تحت بررسی جنس و گونه‌های شاخص آب گرم از قبیل Cyclogelosphaera margerelii، Diazmatolithus lehmanii، Lithraphidites carniolensis، Micrantholithus spp.، Nannoconus spp.، Rhagodiscus asper و Watznaueria spp. به موازات جنس و گونه‌های شاخص آب سرد از قبیل Biscutum constans، Helenea chiastia و Zeugrhabdotus embergeri حضور دارند. درصد فراوانی گونه‌های آب گرم بیش از گونه‌های آب سرد بوده و روند معکوس در فراوانی آن‌ها دیده می‌شود. بر اساس فراوانی جنس و گونه‌های شاخص آب گرم و سرد، سه فاز گرم‌شدگی و دو فاز سردشدگی در محدوده مورد مطالعه قابل ثبت است که شامل حادثه گرم‌شدگی قسمتهای ابتدایی بارمین پیشین، سردشدگی بارمین پیشین، گرم شدگی بارمین میانی، سرد شدگی بارمین پسین و گرم شدگی مرز بارمین-آپتین می‌باشد. لازم به ذکر است که این مطالب با داده‌های ثبت شده از سایر نقاط دنیا در حوضه‌های تتیس (از جمله ایتالیا) و بورآل (از جمله شمال‌غرب آلمان و شمال‌شرق انگلستان) همخوانی دارد.
کلید‌واژه‌ها: بارمین، بیوستراتیگرافی، پالئواکولوژی، سازند گرو، نانوفسیل‌های آهکی.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evidence of Barremian climate based on calcareous nannofossils at Garau Formation (Qaleh-Darreh section)

نویسندگان [English]

  • Maryam Eftekhari
  • Azam Mahanipour
  • Mohammad Dastanpour
Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran.
چکیده [English]

Abstract
Barremian sediments of the Garau Formation have been investigated at the southwest of the Kabir-kuh anticline (Qaleh-Darreh section) with regard to calcareous nannofossils. According to the presence of index calcareous nannofossils, NC5 biozone and NC5c, NC5d and NC5e subzones of Roth (1978) and CC5-CC6 biozones of Sissingh (1977) have been identified. At the studied interval, warm water taxa like Cyclagelosphaera margerelii, Diazomatolithus lehmanii, Lithraphidites carniolensis, Micrantholithus spp., Nannoconus spp., Rhagodiscus asper and Watznaueria spp. have been recorded along with cool water taxa such as Biscutum constans, Helenea chiastia and Zeugrhabdotus embergeri. The abundance of warm water taxa is higher than cool water taxa and a reverse trend can be observed between them. Regarding cool and warm water taxa three warming phases and two cooling phases are identified which includes the warming event of early Early Barremian, cooling event of Early Barremian, warming event of Mid-Barremian, cooling event of late Barremian and warming event of Barremian-Aptian boundary. It must be mentioned that these data are in accord with other parts of the world in the Tethyan (e.g., Italy) and the Boreal realms (e.g., NW Germany and NE England).
Keywords: Barremian, Biostratigraphy, Paleoecology, Garau Formation, Calcareous nannofossils.

کلیدواژه‌ها [English]

  • Barremian
  • Biostratigraphy
  • Paleoecology
  • Garau Formation
  • Calcareous Nannofossils

کتابنگاری

مطیعی، ه.، 1382- زمین‌شناسی ایران (چینه‌شناسی زاگرس)، طرح تدوین کتاب زمین‌شناسی ایران، انتشارات سازمان زمین‌شناسی و اکتشافات معدنی کشور، چاپ دوم، 583 ص.

 

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