Identifying the effects of climate changes on sedimentary environments and determining the sedimentation rate of south wetlands of Lake Urmia during Late Pleistocene and Holocene

Document Type: Original Research Paper

Authors

1 Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran

3 French National Center for Scientific Research (CNRS), Paris, France

4 Engineering, Environmental Geology and Hazards Department, Geological Survey of Iran, Tehran, Iran

Abstract

This study investigated the evolutionary history of the Late glacial in number of wetlands in south part of Lake Urmia. Twenty-six cores with a maximum depth of 12 m, average 8 m and total depth of about 190 m were collected from sediments under the southern and southwestern wetlands using a handi auger. Sedimentary facies were identified and separated based on sediments texture and structure, composition of evaporite minerals and organic materials, also color and other macroscopic elements. The results indicated the presence of eight distinct sedimentary facies belonging to the lacustrine, wetland and fluvial (river) sedimentary environments. In the last 20 cal ka BP, the two dominant dry periods, about 4 cal ka BP and 13 cal ka BP, have been associated with the transgression of dry (alluvial) facies towards the lake and the regression of Lake facies. The dry period 4 cal ka BP affected the southern part of Lake Urmia and marginal wetlands, while the dry period 13000 years ago was more intense and longer and lasted at least 3 cal ka BP.In the last 2cal ka BP, the two dominant dry periods, about 4 cal ka BP and 13 cal ka BP, have been associated with the transgression of dry (alluvial) facies towards the lake and the regression of Lake facies. The dry period 4 cal ka BP affected the southern part of Lake Urmia and marginal wetlands, while the dry period 13000 years ago was more intense and longer and lasted at least 3 cal ka BP.

Keywords


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