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Carbonates and Evaporites

, Volume 13, Issue 1, pp 90–99 | Cite as

Petrofacies analysis and depositional environment of the Jahrum Formation (Eocene), south-southwest of Burujen, Iran

  • Ali Seyrafian
Article

Abstract

A progressive carbonate environment from supratidal to near-shore, retricted to intertidal and restricted shallow marine environment existed during deposition of the Jahrum Formation. The main facies characteristics of the Jahrum Formation in the study area are: (1) a laminated, unfossiliferous dolomite and pelleted dolomitic mudstone with solution collapse breccias; (2) a pelleted laminated fossiliferous dolomitic mudstone; (3) reworked skeletal wackestone to packstone; (4) highly reworked biointraclastic grainstone; (5) fossiliferous wackestone to packstone. As a result, two major depositional systems tracts can be defined: (1) the lower portion, are transgressive systems tract; and (2) the upper portion, as highstand systems tract. Diagenetic processes involved in supratidal rocks of the Jahrum Formation reflect dolomitization of initial sediments, leaching of calcium sulfate and carbonate grains, replacement of dolomite and stylolitziation. Voids are the most common pore type, and porosity was controlled by diagenesis that was influenced by primary depositional texture.

Depositional analysis and environmental interpretations suggest the occurrence of syngenetic euhedral dolomite in supratidal sediments of the Jahrum Formation in a mixing zone between meteoric waters and brines derived from sea water. Syngenetic dolomite is evidenced by fine euhedral crystal, pore shapes and the occurrence of pelletal fabric. Late dolomitization is most common as void-filling and replasive dolomites in rocks that were deposited in higher energy environments.

Keywords

Dolomite Microfacies Dolomitization Wackestone High Stand System Tract 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Northeasten Science Foundation, Inc 1998

Authors and Affiliations

  • Ali Seyrafian
    • 1
  1. 1.Geology Department, Faculty of SciencesUniversity of EsfahanIran

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