Abstract
Top Bajocian progressive deposits are marly accumulation and limestone filled with ammonites and other marine fossils that are called ‘Dalichai formation’ with 1420m in thickness. There are erosion and inconsistent boundary that distinct Dalichai formation from Shemshak formation. The boundary of Dalichai and Lar formations is isocline and graded. The presence of Benthic foraminifera, sponge sparkles, and ammonites in the Sharaf section alludes the existence of shallow to deep open marine. Such diagenetic processes as cementation, micritization, porosity, accumulation, iron oxide and bioturbation are observed in Dalichai formation. The carbonates in this formation could have primary aragonitic composition according to the studies on main and secondary elements, carbon and oxygen isotopes, and drawing these values against each other. In such condition, non-marine diagenesis influenced the carbonates mostly. By comparing Sr/Ca and Mn, a semi-closed to open diagenetic environment can be suggested to have impacts on carbonates. Dalichai formation and Lar formation can identify a boundary in 1200m thickness since there are changes in Sr/Ca, Sr/Na, Sr, and carbon and oxygen isotopes to study. Dalichai formation limestone temperature was calculated 32.9 °C. Regarding lithology and analysis of Sharaf section microfacies, three microfacies are specified that appear as deposits in outer ramp. In this study, the model of Homoclinal ramp is suggested to utilize for such formation. Sharaf section Dalichai Formation entails aragonitic mineralogy composition on which burial diagenesis has substantially influenced.
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