Application of Markov Chain Method in depositional sequences interpretation to provide ichnological model of carbonate sediments of the Mobarak Formation (central and eastern Alborz Zone, North Iran)
Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

The carbonate succession of the Mobarak Formation (Mississippian) located in Central and Eastern Alborz, have a diverse trace fossils in Toyeh Rodbar and Siaheh mountain sections. In this research, different lithofacies cycles of the Mobarak Formation are examined by Markov method as well as field observations, and depositional environment has interpreted by proposed ideal sequence. To do this, the deposits of this Formation have divided into five lithofacies associations including argilaceous limestones intercalated with dark shales bearing Zoophycos ichnofacies, thin- to medium-bedded limestones bearing Cruziana ichnofacies, limestones bearing Skolithos ichnofacies, medium- to thick-bedded limestones bearing mixed Skolithos and Cruziana ichnofacies, and limestones intercalated shales without any trace fossils. Markov chain analysis shows that Mobarak Formation deposits are composed of coarsening upward cycles. A complete cycle from base to top consists of limestones intercalated shales without any trace fossils, argilaceous limestones intercalated with dark shales bearing Zoophycos ichnofacies, thin- to medium-bedded limestones bearing Cruziana ichnofacies, limestones bearing Skolithos ichnofacies, and medium- to thick-bedded limestones bearing mixed Skolithos and Cruziana ichnofacies. The development of sedimentary cycles bearing Ichnofacies is primarily controlled by environmental factors, e.g. sediment type, food accessibility, oxygenation and energy level. In this Formation, four ichnofacies have been recognized including Cruziana, Skolithos, Zoophycos and mixed Skolithos–Cruziana ichnofacies. The inner ramp sediments are characterized by low-diversity Skolithos elements.

Language:
Persian
Published:
Applied Sedimentology, Volume:7 Issue: 13, 2019
Pages:
77 to 93
magiran.com/p2098704  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 990,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
دسترسی سراسری کاربران دانشگاه پیام نور!
اعضای هیئت علمی و دانشجویان دانشگاه پیام نور در سراسر کشور، در صورت ثبت نام با ایمیل دانشگاهی، تا پایان فروردین ماه 1403 به مقالات سایت دسترسی خواهند داشت!
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 50 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!