The Eocene – Oligocene Facieses and Sedimentary Environments in Sardarreh Area, Garmsar

سال انتشار: 1393
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,029

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شناسه ملی سند علمی:

NCEEE01_013

تاریخ نمایه سازی: 25 مهر 1393

چکیده مقاله:

This research studies the Eocene – Oligocene facieses and sedimentary environments have in Sardarreh, Garmsar. Field studies were conducted to achieve this goal. So, 95samples were taken from the studied section. Because of the similarity of the samples, 49samples were selected for the preparation of thin sections. For facies interpretation and providing sedimentary model(Carruzi, 1989 ( ،(Flugel, 2011) and naming of carbonate rocks (Dunham, 1962) ،(Folk, 1962) and (Chen, 2011) were used. Thin section consists of: skeletal elements, including(Mollusks, Brakiopoda, Akinoderma, Foraminifera, Algae, Ostracoda, Gastropods) and Non-skeletal particles(pelloidy, intra-clast), Quartz(grains of sand), Gloconite, Feldspar, Chert, Gypsum, Salt, Anhydrite and facies’s matrix are calcareous mud and micritic or Asparitic cement. These studies led to the identification and separation of 7carbonate and destruction facies that have deposited in 4 facies belt. Open marine facies includes: A1: Bio-clast pack stone. Barrier facies takes in: B1: Pelloid bio-clast grain stone. Pool facies holds: C1: Gypsi- ferrous marl, C2: Calcareous sandstone. Tidal facies zone comprises: D1: Sandy pelloid wack stone / pack stone, D2: Sandy intra-clast wack stone / pack stone and D3: Fenestral mudstone. Due to interpretation of these facieses and their environments, the ancient geographical situation of this area is characterized. This is a carbonate platform which is a kind of carbonate Rimmed shelf.

نویسندگان

Gh Mohammadi

Faculty Member of Islamic Azad University, South Tehran Branch

M Pursafari

M.Sc Student of Geology and Sedimentology, Islamic Azad University of Shahrud

A Ashofteh

M.Sc of Mining Engineering, Islamic Azad University, South Tehran Branch