Microbiostratigraphy, facies and sedimentary environment of the Jahrum Formation, northwest of Shiraz

Document Type : Research Paper

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Abstract

The Jahrum Formation with 192 m thickness at the studied area consists of carbonate sequence which overlies Pabdeh Formation sharply and underlies the Asmari Formation gradually. The aim of this paper is to describe the microbiostratigraphy, biological facies and sedimentary environment interpretation of Jahrum Formation at the section studied. Based on biostratigraphic studies 19 genera and 27 species of benthic foraminifera were identified which are located in two assemblage zones. Biozone no. 1 (Nummulites – Alveolina assemblage subzone) belonging to the Middle Eocene age and biozone no. 2 (Nummulites fabiani taxon range zone) belong to the Late Eocene age. According to the diagnosed biozones, the age of Jahrum Formation at the studied section is Middle Eocene - Late Eocene. Studies led to the identification of eight biofacies of lagoon, shoal and open sea. The absence of turbidite deposits and reef facies indicate sediments deposition of Jahrum Formation has occurred in a carbonate platform of hemoclinal ramp type (including inner, middle and outer ramp).

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References

منابع
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Applied Sedimentology
Volume 3, Issue 5 - Serial Number 5
February 2015
Pages 43-53

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History

  • Receive Date: 12 August 2015
  • Revise Date: 13 April 2016
  • Accept Date: 09 April 2016

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