Post-depositional history of Asmari Formation using petrographic as well as carbon and oxygen isotopes date in Hyderabad and Robat Namaki sections, north of Khorramabad

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Abstract

In northern region of Khorramabad city in Lurestan province, Asmari Formation is mainly composed of limestone with some interbeds of marl. The studied Formation, is late Oligocene-Early Miocene in age. In this study, petrographic studies as well as stable isotopes of oxygen and carbon have been used to make an understanding of after sedimentation conditions. We also have identified and distinguished some evidence from each diagenetic stage. Consideration of the cements, which have been deposited in cavities and fractures of carbonate rocks shows that sometimes there are differences in the isotopic oxygen content and carbon content of the edge and central parts. However, these changes in many cases are slight. Numerous diagenetic processes such as calcite cementation (syntaxial overgrowth cement, isopachous fibrous, spar mosaic cement, blocky cement, and granular cement), iron oxide cement, pyrite, limited dolomitization, micritiization, bioturbation, fractures and fillings and dissolution, incremental neomorphism, physical and chemical compaction (stylolite and stilomotel) have been affected the limestone successions of Asmari Formation in the study area. Some of these processes may occur in several diagenetic environments. In order to differentiate them, we have used cathodoluminescence and isotope study techniques. We have been utilized the oxygen and carbon stable isotopes track each diagenetic phase. In this study, we have used cathodoluminescence images to make a map for isotopic analysis. Finally, by integrating petrographic, cathoduminescence, and isotopic data, different diagenetic environments have been identified and distinguished. We hope this information make a more accurate picture of after sedimentation conditions of the sedimentary Basin.

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References

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  • Receive Date: 28 February 2022
  • Revise Date: 25 April 2022
  • Accept Date: 30 April 2022

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