بررسی زیست‌چینه‌نگاری نانوفسیل‌های آهکی سازند گورپی در برش کلچنار در شمال باختر ایذه

نوع مقاله: مقاله پژوهشی

نویسنده

دانشیار، گروه معدن، دانشگاه بین‌المللی امام خمینی(ره)، قزوین، ایران

چکیده

در این مطالعه نانوفسیل‌های آهکی سازند گورپی در برش کلچنار در شمال باختر ایذه بررسی شده است. در این برش سازند گورپی از مارن، مارن شیلی و سنگ‌آهک مارنی تشکیل شده است. به منظور معرفی گونه های شاخص، تجمعات فسیلی همراه و زیست زون ها، 150 نمونه اسلاید از سازند گورپی مطالعه شد که در نتیجه به تشخیص12 زیست زون  انجامید. در این مطالعه 61 گونه و 35 جنس از نانوفسیل های آهکی شناسایی شد. بر پایه زیست زون های به دست آمده، بازه زمانی سازند گورپی در برش مورد مطالعه از اواخر کامپانین (late Campanian) تا پالئوسن پسین (Late Selandian) و مرز کرتاسه- پالئوژن پیوسته پیشنهاد می شود. این بازه با زیست زون های CC21-CC26 از زون‌بندی
(Sissingh (1977 و زون‌های NP1-NP6 از زون بندی (Martini (1971 همخوانی دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Calcareous nannofossils biostratigraphy of the Gurpi Formation at Kalchenar section in Northwest of Izeh

نویسنده [English]

  • S. Senemari
Associate Professor, Department of Mining, Imam Khomeini International University, Qazvin, Iran
چکیده [English]

Calcareous Nannofossils of the Gurpi Formation have been investigated at Kalchenar section (Northwest of Izeh). In this section, the Gurpi Formation is mainly consists of marls, shaly marls and marly limestones. For introducing index species, calcareous nannofossil assemblages and biozones, 150 slides have been studied which led to the recognition of twelve biozones. As a result, 61 species, 35 genera of calcareous nannofossils were detected. According to the identified biozones, the age of the Gurpi Formation is Late Campanian to Late Paleocene (Late Selandian) and K/Pg boundary is continuous at the studied interval, that is corresponding to CC21- CC26of zonation scheme of Sissingh (1977) and NP1- NP6 of zonation of Martini (1971).

کلیدواژه‌ها [English]

  • Izeh Section
  • Biostratigraphy
  • Paleogene
  • Zagros Basin
  • Cretaceous
  • Calcareous Nannofossils

درویش‌زاده، ع.، 1370- زمین­شناسی ایران. انتشارات نشر دانش امروز ،  901 ص.

 

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