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| 1 | Genesis of tuff interval and its uranium enrichment in Upper Triassic of Ordos Basin, NW China显示文摘Recently measured high gamma ray values in the Yanchang Formation of the Upper Triassic in the Ordos Basin have added an interesting and controversial twist to the study of the formation’s uranium enrichment and genesis.High uranium and thorium contents in the tuffaceous layer cause high gamma ray values in the Yanchang Formation.Petrographic studies,major elements,rare earth elements(REEs),and trace elements have been systematically analyzed to determine the composition,geochemical environment,and diagenetic processes of the layer.The observed color of the tuffaceous layer in the study area varies from yellow to yellowish brown.The tuff consists of matrix supported with sub-rounded to sub-angular lithic fragments.These lithic fragments probably derived from pre-existing rocks and incorporated into the tuffaceous layer during volcanic eruption.Quartz,plagioclase,and biotite were observed in well to poorly sorted form,in addition to framboidal pyrite and organic laminae.Measured ratios of SiO_2/Al_2O_3 ranged from 3.277 to 6.105 with an average of 3.738.The ratio of TiO_2/Al_2O_3 varied from 0.037 to 0.201 with an average of 0.061,indicating that the sediments of the tuffaceous layer originated from an intermediate magma.REE distribution patterns show sharp negative Eu anomalies,indicating a reducing environment,which is suitable for uranium deposition.A reducing environment was confirmed by black shale in the base of the Yanchang Formation.Such black shale has high organic matter content that can take kerogene from mudstone and provide a reducing environment for uranium enrichment in the tuffaceous layer.Moreover,negative Eu anomalies and the REE patterns indicate a subduction-related volcanic arc environment as the magma source of the tuffaceous layers.High values of Rb,Ba,and Sr might be the result of fluid phase activities;low values of Hf and Eu indicate the involvement of crustal material during diagenesis of the tuff.Discrimination diagrams(Th/Yb vs Ta/Yb,Th/Hf vs Ta/Hf)suggest an active continental margin as the tectonic setting of source volcanoes.Plots of Nb versus Y,Rb versus Y+Nb,TiO_2 versus Zr,and Th/Yb versus Nb/Yb of the tuffaceous content point to calc-alkaline continental arc-related magmatism.We concluded that uranium enrichment in the tuffaceous layer was supported by oxidation–reduction. | Shamim Akhtar Nosheen Sahir Xiaoyong Yang | 2018 | Acta Geochimica2018，37，1： | 4 |
| 2 | Process modeling,simulation,and paint thickness measurement for robotic spray painting显示文摘 | SAHIR ARIKAN M A BALKAN T | 2000 | Journal of Robotic Systems2000，17，9： | 1 |
| 3 | The GABAergic deficit hypothesis ofmajor depressive disorder显示文摘 | Luscher B Shen Q Sahir N | 2011 | Mol Psychiatry ^2011，16，4： | 1 |
| 4 | Process modeling, simulation, and paint thickness measurement for robotic spray painting 显示文摘 | Sahir M A Balkan T | 2000 | Journal of Robotic Systems2000，17，9： | 1 |
| 5 | Energy Analysis of Chilled Water System Configurations using Simulation-based Optimization显示文摘 | Muzaffar Ali Vladimir Vukovic Mukhtar Hussain Sahir Giuliano Fontanella | 2012 | Energy & Buildings2012，，： | 1 |
| 6 | Process modeling,simulation and paint thickness measurement for robotic spray painting显示文摘 | SAHIR M A TUNA B | 2000 | Journal of Robotic Systems2000，17，9： | 1 |
| 7 | Carbamylation of serum albumin and erythropoietin resistance in end stage kidney disease显示文摘 | Sahir K Hector T Elizabeth A | 2013 | Clin J Am Soc Nephrol2013，8，11： | 1 |
| 8 | Assessment of new and renewable en- ergy resources potential and identification of barriers to their significant utilization in Pakistan 显示文摘 | Mukhtar H Sahir | 2008 | Renewable and Sustain- able Energy Reviews2008，12，1： | 1 |
| 9 | A method of inverse kinematics solution including singular and multiple configurations for a class of robotic manipulators 显示文摘 | Tuna Balkan Kemal ozgoren M Sahir Arikan M A | 2000 | Mechanism and Machine Theory2000，35，： | 1 |
| 10 | Effect of comprex supercharging on diesel emissions显示文摘 | HASIMOGLU Can SALMAN Sahir | 2003 | Energy Conversion and Management2003，44，11： | 1 |
| 11 | Process modeling, simulation andpaint thickness measurement for robotic spray painting 显示文摘 | Arikan M A Sahir Balkan Tuna | 2000 | Journalof Robotic Systems2000，17，9： | 1 |
| 12 | Usefulness of pulsed-wave tissue Doppler echocardiography for the assessment of the left and right ventricular function in patients with clinical hypothyroidism 显示文摘 | Kosar F Sahir 1 Aksoy Y | 2006 | Echocardiography2006，23，6： | 1 |
| 13 | Process Modeling, Simulation, and Paint Thickness Measurement for Robotic Spray Painting 显示文摘 | Sahir Arikan M A Balkan T | 2000 | Journal of Robotic System2000，17，9： | 1 |
| 14 | Protein Crystallization Facilitated by Molecularly Imprinted Polymers显示文摘 | Emmanuel S Sahir K Lata G | 2011 | Proceedings of the National Academy of Sciences2011，108，11： | 1 |
| 15 | Process simulation and paint thickness measurement for robotic spray painting 显示文摘 | Sahir Arikan M A Balkan T | 2001 | Annals of the CIRP2001，50，1： | 1 |
| 16 | Lipase - catalyzed acidolysis of tripalmitin with hazelnut oil fatty acids and stearic acid to produce human milk fat substitute 显示文摘 | SAHIR N AKOH C C KARAALI A | 2005 | J Agric Food Chem2005，53，： | 1 |
| 17 | Porous Nucleating Agents for Protein Crystallization显示文摘 | Sahir K Emmanuel S Lata G | 2014 | Nature Protocols2014，9，7： | 1 |
| 18 | Performance Rating of spur Gears with Nonstandard Proportions and Profiles 显示文摘 | Sahir Arikan M A 0zlem (Uyar) Carkoglu | 1993 | CIRP Annals-Manufacturing Technology1993，42，1： | 1 |
| 19 | Process Modeling Simulation and Paint thickness Measurement for Robotic Spray Painting显示文摘 | Sahir Arikan M A Balkan T | 2000 | Journal of Robotic System2000，17，9： | 1 |
| 20 | Energy analysis of chilled water system configurations using simulation-based optimization显示文摘 | Ali M Vukovic V Sahir M H | 2013 | Energy and Buildings2013，59，： | 1 |
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