Sedimentology and geochemistry of coastal sediments of Pozm Bay, southeastern Iran

The study area is located in the northwest of Chabahar city and south of Sistan and Baluchestan province in the southeast of Iran. This area is part of Makran geological area. In this research, library and documentary studies were performed first. Then, in field studies and field visits, two sediment cores were prepared from Holocene sediments in the shallow coastal area and below the tidal limit in the Gulf of Pazm using the Euger core-catching device. Sedimentary samples from different parts of the sedimentary core (22 samples) were subjected to sedimentological and geochemical analyzes. The results of sediment granulation show that the particle size is often in the range of clay to silt and less amounts of sand and gravel, which in some horizons show particles in the size of sand and gravel. Gravel particles are mainly associated with skeletal fragments and the amount of carbonate in sediments varies between 17 and 84%. The abundance of most elements, especially aluminum, magnesium, manganese, cream, barium are inversely related to changes in sea level and the two elements of calcium and strontium, which represent sediments in the basin, are directly related to changes in sea level. The results of equating the approximate age of the sedimentary sequence show that two important phases of progress and rapid sea level rise occurred in the time range from 2100 to 2800 and also from 4900 to 5800 years ago.