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Imagery from the first Earth Resources Technology Satellite passes over east-central Iran are interpreted with special emphasis on geomorphology of the structural trends in the area. Several units of arcuate structure are named and discussed. Newly found dislocations and other lineaments within the Lut Block, in addition to its internal seismicity and Quaternary volcanic activity, support the argument against the rigidity of the block.Neotectonic and seismotectonic maps of the area are prepared and discussed. These maps reveal a complicated and mostly radial pattern of the pre-Neogene compressive directions. The post-Neogene directions of compression are, however, consistent with a NE—NNE trend throughout the area. These axes of maximum horizontal shortening are deduced from the trend of normal and en-echelon Neogene folds, the pattern and sense of movement of faults active in Quaternary, geodetic measurements, and the source mechanism of earthquakes.It is concluded that the plate-tectonic concept cannot readily be used to explain the recent deformation taking place in continental area structurally as complicated as eastcentral Iran. 相似文献
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M. Behzadi M. A. Taher F. Hassani Moghaddam 《International Journal of Environmental Science and Technology》2017,14(5):999-1010
A solid-phase extraction procedure was described for the quantitative extraction of a mixture of lead, cadmium, copper and bismuth ions on modified multiwalled carbon nanotubes, graphene oxide nanosheets, activated carbon and carbon black, individually. Then, the adsorbed analytes were eluted with HCl and introduced directly to electrothermal atomic absorption spectrometry. The surface morphology of the adsorbents was investigated by field-emission scanning electron microscopy. The parameters affecting the adsorption–elution process such as pH and flow rate of the sample solution—type, concentration, volume and flow rate of eluent were optimized in detail. Adsorption capacities, breakthrough volumes and enrichment factors were also studied. Wide calibration curves with good correlation coefficients, low detection limits and acceptable relative standard deviations were obtained for all analytes on different adsorbents. The results showed, when nanoadsorbents were used, higher adsorption and recoveries were obtained for all of the studied metal ions. The proposed method has been applied to the determination of Pb(II), Cd(II), Cu(II) and Bi(III) in water, wastewaters, human urine and human hair samples. The spiked recoveries were in the range 93.0–106%. Also, the accuracy of the method was validated by analyzing a certified reference material. 相似文献
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This paper describes the results of an experiment which was performed with a Plasticine model to investigate the progressive evolution of flexural-slip folds. The model analyses the relationship between bulk shortening and the amount of flexural slip on fold limbs and in hinge zones. In the light of the experimental results, the theoretical relationship between limb dip and angular shear strain proposed by Ramsay (1967, p. 393) needs modifying to take into account the effect of hinge dilation and limb thinning at large deformations. 相似文献
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Geomorphic and seismic data relative to one of the major faults of Iran, the Doruneh Fault, are presented. It is shown that along its eastern section, the fault is presently active and connected with two destructive earthquakes during the twentieth century. Contrary to previous assumptions, recent and probably contemporary movements along it are essentially in the vertical direction. 相似文献
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The air quality analyses for nitrogen dioxide (NO2) were conducted in Tehran, capital of Iran. Daily and annual variations in its average concentrations were calculated using measurements from four sampling stations. Multiple linear and nonlinear regression equations for relationships between concentration of pollutant and meteorological parameters were obtained from average data. The RMSE test showed that the stepwise model is the best option among the considered prediction models. 相似文献
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Chatrsimab Zahra Alesheikh Ali Asghar Voosoghi Behzad Behzadi Saeed Modiri Mehdi 《Doklady Earth Sciences》2020,494(1):718-725
Doklady Earth Sciences - Land subsidence, as a dangerous environmental issue, causes serious damages to farms and urban infrastructure. In this regards, this research was conducted with aimed to... 相似文献
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