Document Type : Original Research Paper

Authors

1 Ph.D. Student, Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran

2 Associate Porfessor, Islamic Azad University, North Tehran Branch

3 .Assistant Professor, Research Institute For Earth Sciences, Geological Survey of Iran,

4 Assistant Professor, Research Institute For Earth Sciences, Geological Survey of Iran, Tehran, Ira

5 Ph.D., Geological Survey of Iran, Tehran, Iran

Abstract

The purpose of this research is to identify quaternary units and determine the sediment boundaries around Yazd city in Central Iran. The origin of Quaternary sediments is mainly related to erosion of the Triassic, Cretaceous, and Palaeozoic units. Based on the results of sedimentation, six types of facies were identified as Mud, silt, sandy silt, silty sand, mud sands and sandy mud. The XRD results of the samples show that these specimens consist mainly of quartz, calcite, dolomite, feldspar, coperite and clay minerals. In the fossil studies of two important species of ostracodes called Ilyocypris sp. Which refers to sweet waters and Candona .sp, which relate to various saline waters. Due to the diversity of facies and fossils, approximately the lake in the study area was developed in late Quaternary. Facies characteristics, the type of minerals and index fossils indicate that the sedimentation of these facies in a sedimentary lake environment that was first identified in the study area.

Keywords

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