Document Type : Original Research Paper

Authors

1 Ph.D., Department of Geology, Faculty of Basic Sciences, Science and Research Branch, Islamic Azad University, Geological Survey of Iran, Tehran, Iran

2 Assistant Professor, Faculty of Earth Science, Kharazmi University, Tehran, Iran

3 Assistant Professor, Research Institute for Earth Science, Geological Survey of Iran, Tehran, Iran

4 Assistant Professor, Department of Geology, Faculty of Basic Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

Lake Urmia is the greatest hayper salin Lake in the world. This Lake, located in Azerbaijan area, Northwest of Iran is an intra-continental sedimentary basin. Its area is about 6000 km2 with an average water depth of 6 meter. Evaluation of past climate change in Lake Urmia, according to Clay Minerals, is the main subject for current study. For mineralogical and sedimentological investigations 18 sediment cores were collected from the east and west of Urmia lake. 96 samples from 18 sediment cores in transect to the center of lake were collected and studied by X-ray diffraction (XRD) technique. The clay minerals include Kaolinite, Illite and Montmorillonite. Kaolinite and Illite are the most important clay minerals in the Coastal plain of urmia lake. Origins of clay minerals in the Coastal plain of urmia lake are generally detrital, occurred by physical weathering and indicate composition of bed rock. The study of surface sediments indicates that amount of clay minerals from margin to center of the lake such as another detrital mineral (Quartz) is decreased. In addition, amount of them towards depth is increased. Therefore, it shows the presence of a high water level and cold - humid climate in the past (late Pleistocene).

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