Paleoclimate of Abzalou wetland in Khuzestan Province with using Sedimentary Cores

Lake basins have spatially and temporally index patterns and represent valuable maps of physical and chemical history. According to this point, that direct survey of climate changes has only been available as machinery in the past few decades, so past’s climate changes indexes can give a better understanding of climate changes in the past era and its causes. Of these, lake sediments have an extraordinary ability to record climatic and environmental events with high sensitivity and resolution and very high- resolution amounts. Therefore, lake sediments can be considered as regions for detecting paleontological environments. Abzalou Lake formed in the northeast of Khuzestan province on the hillsides of folded Zagros and under the Izeh unit in a pit. This study has been tried to by sedimentary examination, identification of sedimentary facies, identification of sedimentary environments and changes of these environments set to the reformation the climatic and environmental conditions of Abzalou wetland in the end Holocene. The steps of this research include book studies, field works, laboratory works, data processing and then interpretation and conclusion. To investigate the paleontological climate and conditions of the sedimentary environment, ۸ intact sediment cores with a maximum depth of ۷.۵ m and total of ۳۵ m collected with using Auger corer. In this regard, tried to the position of the core be in a way that makes it possible to collect the maximum thickness of wetland bed’s sediments, give maximum coverage to wetland’s sedimentary environments and at least collect one sample in each homogenization work unit as much as possible. Based on field observations, core’s description and lab results, the cores separated into sedimentary units and their stratigraphy columns drew and determined under each sedimentary unit. Also, ۳ sediment samples sent to ETH Zürich Institute of geology to age/ date measurement analyzing by the radiocarbon method of organic matters. According to the results of surveys in the Abzalou wetland, at least ۳ high water periods with humid climate and at least ۲ dry periods during the Late Holocene were identified. Dry periods appear more suddenly and with more intensity and shorter duration than humid periods in the region and gradually lead to from very dry periods to semi-arid, semi-humid, and eventually humid periods.

کلیدواژه ها:

Abzalou wetland ، Paleoclimatology ، Paleogeography ، Sedimentary core ، Holocene