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Hydrogeochemical analysis for Tasuj plain aquifer, Iran 总被引：1，自引：0，他引：1
ATA ALLAH NADIRI ASGHAR ASGHARI MOGHADDAM FRANK T-C TSAI ELHAM FIJANI 《Journal of Earth System Science》2013,122(4):1091-1105
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M. Javidi MOGHADDAM M.H. KARIMPOUR K. Ebrahimi NASRABADI M.R. Haidarian SHAHRI A. Malekzadeh SHAFAROUDI 《《地质学报》英文版》2018,92(3):1139-1156
The Khur metallogenic district is located in a volcanic-plutonic belt in the central Lut Block(central eastern Iran). Mineralization occurs in Middle Eocene andesitic tuff and along four main vein systems trending northwest-southeast(Shurk, Mir-e-Khash, Shikasteh Sabz and Ghar-e-Kaftar veins).Microscopic studies reveal that the veins contain bornite, chalcocite, pyrite, tennantite together with minor sphalerite and chalcopyrite as hypogene minerals and chalcocite, digenite, covellite, valleriite,malachite, azurite, atacamite, hematite, and goethite as supergene minerals. The ore bodies are accompanied by narrow but intensely developed wall rock alterations of argillization, carbonatization and silicification. Copper content reaches 6.5, 2.4, 4.2 and 5% in Mir-e-Khash, Shikasteh Sabz, Ghar-eKaftar and Shurk, respectively. Microthermometric measurements of quartz-and calcite-hosted fluid inclusions indicate that the mineralization might be derived from a moderately saline hydrothermal fluid at temperatures between 175-316℃. Calculated δ~(18)O values of water in equilibrium with quartz and calcite for Khur veins suggest that the fluid might have had a magmatic source, but the ~(18)O-depletion was developed through mixing with meteoric water. Copper deposition in Khur veins is believed to have been largely caused by mixing, although wall rock reactions may also have occurred. The Khur veins are classified as volcanic-subvolcanic hydrothermal-related vein deposits. 相似文献
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Power Maximization of A Point Absorber Wave Energy Converter Using Improved Model Predictive Control 总被引：1，自引：0，他引：1
This paper considers controlling and maximizing the absorbed power of wave energy converters for irregular waves. With respect to physical constraints of the system, a model predictive control is applied. Irregular waves’ behavior is predicted by Kalman filter method. Owing to the great influence of controller parameters on the absorbed power, these parameters are optimized by imperialist competitive algorithm. The results illustrate the method’s efficiency in maximizing the extracted power in the presence of unknown excitation force which should be predicted by Kalman filter. 相似文献
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The Mirge-Naqshineh gold district is situated at northwest of Iran with a NW-trending brittleductile shear zone. It is hosted by Precambrian meta-sedimentary and meta-volcanic units traversed by mineralized quartz veins. In terms of cross-cutting relationships and sulfide content three types of quartz veins are identified in the region. Among those, parallel to bedding quartz vein(type Ⅰ) is the main host for gold mineralization. Gold is found in three different forms: 1) submicrometer-size inclusions of gold in arsenian pyrite, 2) as electrum and 3) in the crystal lattice of sulfides(pyrite, galena and chalcopyrite). Six types of pyrite(Py1-Py6) were identified in this ore reserve. Py3 coexists with arsenopyrite and contains the greatest As-Au concentrations. There is a negative correlation between the As and S contents in Py2 and Py3, implying the substitution of sulfur by arsenic. Pyrites and mineralized quartz veins were formed via metamorphic-hydrothermal fluid and reflect the gold-transportation as Au(HS)_2~- under reducing and acidic conditions. The gold precipitation mainly controlled by crystallization of arsenian pyrite during fluid/rock interactions and variation of fO_2. The volcanic host rock has played an important role in gold concentration, as Py3 in this rock contains inclusion of gold particles, but gold is within the lattice of pyrite in phyllite or other units. 相似文献
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