![]() On the other hand, mean water table seems between 1.40 and 1.20 meters during Sep. The average of velocities and thicknesses of the first layer (consists of grayish silty sandy clay soil) are equal to 259.33, 147.83 m/sec and 6.58 m, and for the second one (consists of brownish and greenish silty clay soil with sand) are 517, 273.25 m/sec for each P and S-waves respectively. The calculations demonstrate that there are two shallow subsurface layers were found. These two techniques were done in order to delineate depths and thicknesses of the layers (soils), their dynamic elastic modulus and groundwater level underlying such establishment building may use for future landfill purposes. In addition, cross-hole, down-hole and up-hole seismic refraction using couple boreholes were also conducted in the investigated site. to 1000 B.P., showing the distribution of ancient rivers, back swamps, delta and ancient marine shore line.įour seismic refraction profiles for both compressional (P) and shear (S) waves had been surveyed within AlKifil District/Babylon Governorate, Middle of Iraq, by the use of three impacts normal, center and reverse shootings. Accordingly, nine paleoecological maps for the Southern Mesopotamia are made to represent the age intervals between 22000 B.P. The base of the Ur Flood bed is considered as a marker for correlations between the studied boreholes, and to distinguish the successive depositional cycles basing on their faunal content of ostracoda and foraminifera. Those rates of sedimentation found in this study are varies from a borehole to another, according to the environment of deposition fluvial, back swamps, deltaic or marine environments. Rates of sedimentation are calculated and corrected for compaction in this study, relative to previously measured C 14 dating by some authors, for the marine and non-marine (Ur Flood) deposits. The data are collected from 86 boreholes (including 12 deep boreholes), covering almost the entire Southern Mesopotamia. The distributions of rivers, back swamps, delta, and ancient marine shore line of Southern Mesopotamia during Late Pleistocene – Holocene have been studied depending on the ostracoda and foraminifera assemblages as ecological indicators to determine the ecofacies and paleosalinities, which diagnose different depositional environments. ![]()
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