Application of geochemical data in recognition of subtropical carbonate environment of Ilam Formation, Izeh, Iran
The Ilam Formation, one of the most important petroleum reservoirs in Iran, was deposited on a carbonate platform, ranging in age from Santonian to Companian in Peyon area, Izeh (Zagross), southwest of Iran. Major (Ca, Mg) and minor (Sr, Mn, Na, Fe) elements, and δ18O and δ13C data were used to understand the sedimentary environment, based on the original carbonate mineralogy of the Ilam limestone. Geochemical values indicate that aragonite was the original carbonate mineral in Ilam and formed in warm shallow marine conditions. Paleotemperature calculations based on oxygen isotope values of the least altered sample indicate that sea water temperature was around 28 ℃ during Ilam deposition. Recognition of the boundary between Ilam and Sarvak formations was difficult due to similar facies and the absence of the Surgah Formation. Thus,elemental, and oxygen and carbon isotope analyses were used to determine the boundary between these two formations. Geochemical data of the Ilam carbonates also demonstrate that they were affected by non-marine diagenesis in a closed diagenetic system with minor water/rock interactions.
E.Asadi Mehmandousti M.H.Adabi
School of Earth Sciences, Shahid Beheshti University, Evin, Tehran, Iran
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
973-977
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）