Applied Sedimentology

Applied Sedimentology

Paleoclimate in Lake Sediments according to biological remains studies during Late Holocene (Folded Zagros)

Authors
1 Assist. Prof., Dept., of Geology, Payame Noor Unvierstiy, Tehran, Iran
2 Ph. D., in geomorphology, Geological survey of Iran, Tehran, Iran
Abstract
The studied area is located in the northeast of Khuzestan province and in the range of the folded Zagros highlands and is located in the sub-unit of Izeh in geomorphological division. Investigating the history of sedimentation, paleoclimate changes and identifying dry and wet periods in the late Holocene period is the subject of this research. In this research, an intact sedimentary core with a depth of 720 cm was taken from the bed sediments of Chegarman Lake by hand corer. Sedimentary facies were identified based on the texture, structure and size of sediments, organic matter, color, plant and animal remains, and other macroscopic components. According to the sedimentological studies, type of biological remains, the climatic and environmental changes of the region was investigated. According to previous studies (Darvishi khatooni et al., 2019) in this sedimentary-structural zone, the sedimentation rate is about 1.4 mm per year. But the sedimentation rate is different for different depths and times. In the studied sedimentary sequence, at least two wet periods, from about 4000 to 3100 (BP) and 1250 to 200 (BP) and two dry periods about 4500-4300 (BP) (warm and dry) and about 3100 to 1250 (BP) (cold and dry) were identified during the late Holocene (last 5000 years). The most severe dry period, the dry period about 4500-4300 (BP), occurred at the beginning of the late Holocene. The dry period appeared suddenly in the region and ended gradually, and the wet periods started gradually and ended suddenly. Dry periods have appeared in the region great and shorter than wet periods.
Keywords

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  • Receive Date 16 July 2024
  • Revise Date 28 November 2024
  • Accept Date 04 December 2024