Petrography and geochemistry of dolomites of the Surmeh Formation in the interior Fars region, southwest Iran

Authors

1 Department of Geology, Payame Noor University, Ahvaz, Iran

2 Geological Survey, University of Illinois, USA

3 Department of Geology, Islamic Azad University, Tehran, Iran

Abstract

The Surmeh Formation (Toarcian-Tithonian) is the oldest lithostratigraphic unit of the Lower Jurassic-Lower Cretaceous Khami Group that crops out in parts of central and eastern Zagros Mountains. It is up to 1000 meters in parts of southwest Iran and is subdivided into three carbonate and two shale units. Petrographic and geochemical evidence (δ13C and δ18O isotopes and Mn, Fe, Mg, Sr, Na and Ca analysis) of the Surmeh Formation in the interior Fars has revealed the presence of four types of dolomites including micritic, finely crystalline, baroque and dolosparite, which have been originated near surface (tidal) to deep burial conditions. The main source of the Mg in these dolomites includes sea water, conversion of HMC to LMC, shale compaction and evaporite dissolution. The temperature formation of the early and baroque dolomites is calculated to be 33 and 74ºC respectively.
 

Keywords

References

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Advanced Applied Geology
Volume 1, Issue 2 - Serial Number 2
January 2012
Pages 67-76

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