Stratigraphy, microfacies, and magnetic susceptibility of Permian carbonate deposits North of Maku (Azerbaijan)

Vast Permian carbonate deposits exist in the Maku area as compared with other parts of Iran، and comprise dark gray limestones with a thickness of about 926 m. Based on lithostratigraphic studies، there are three lithologic units (bellerophon limestones، cherty limestones، and crystallized and dolomitic massive limestones) in the Permian deposits. Biostratigraphic studies led to the identification of four biozones representing the Murgabian– Djulfian age for carbonate deposits in the studied section. According to microscopic studies، there are nine microfacies that belong to the carbonate ramp with inner-ramp، mid-ramp، and outer-ramp environments. Magnetic susceptibility values of these deposits were measured between 10 × 10−6 SI and 30 × 10−6 SI، and mostly show negative values. Integration of magnetic susceptibility، stratigraphy، and microfacies studies showed that the carbonate production rate on ages {1. 2 [EN] Meaning unclear} and in different depositional environments were the main factors leading to magnetic susceptibility changes in the studied section.