Yu Y.-S.,Key Laboratory of Nuclear Resources and Environment ECIT |
Yang Z.-S.,Chinese Academy of Geological Sciences |
Tian S.-H.,Chinese Academy of Geological Sciences |
Gao Y.,Jiangxi Institute of Geological Survey |
And 2 more authors.
Geology in China | Year: 2015
The Ri' a copper-polymetallic deposit, as a typical representative copper metallogenesis of the Nixiong orefield and an important part of Cuoqin-Shenzha iron-copper metallogenetic belt, is located in the middle north of Gangdise. The authors analyzed the mineral composition, major elements, trace elements, and U-Th-Pb composition of zircon from biotite granite associated with copper mineralization in the Ri' a copper polymetallic deposit by LA-ICP-MS. The results show that the biotite granite has typical characteristics of I-type granite, belongs to shoshonite series and must have originated from a crustal-mantle provenance. Zircon U-Th-Pb dating yielded 206Pb/238U age of (89.9±1.6)Ma, which is consistent with the age of mafic intrusive in the Ri' a copper-polymetallic deposit. Combined with the results of previous studies, the authors hold that the bimodal magmatism of Early Late Cretaceous was closely related to mineralization of the Ri' a copper-polymetallic deposit. In consideration of the tectonic environment, the authors propose that the magmatism was controlled by the subduction of both Bangong Co-Nujiang ocean crust and Brahmaputra ocean crust.
Gongxin C.,Key Laboratory of Nuclear Resources and Environment ECIT |
Gongxin C.,East China Institute of Technology |
Lei W.,East China Institute of Technology
Advanced Materials Research | Year: 2010
Based on the detailed analysis of site engineering geological and hydro-geological conditions for the proposed project Nanchang International Finance Center high-rise building, the dewatering design of this fundamental pit is proposed, in accordance with the surrounding environment as well as those pit design elements and so on. The three-dimensional numerical simulation model of groundwater for dewatering is also established. Using the three-dimensional groundwater numerical simulation software, Visual-modflow, the site is meshed into grid and the dewatering model is built under different well numbers and space. Al last, an optimal program (10 pumping wells for each pit and well equaling space) for this pit has been determined. It is also to simulate the water level vs. time during the dewatering. This does not only provide a strong basis for the optimum design of the foundation pit dewatering, but also provide a scientific basis for decision making to the underground construction.
Chen G.-X.,Key Laboratory of Nuclear Resources and Environment ECIT |
Chen G.-X.,East China Institute of Technology |
Liu J.-H.,East China Institute of Technology
2010 2nd Conference on Environmental Science and Information Application Technology, ESIAT 2010 | Year: 2010
Based on the study of characteristic of strata and tectonic of Zhongkouzi basin, one of the basins in Beishan basin group, the hydrogeological division has been discussed, as well as the recharge, the runoff and the discharge of groundwater in our study in this area. By analyzing the characteristics both of nature water chemistry and isotopic hydrogeochemistry, the hydrogeobgy properties have been researched of groundwater sampling site. The advanced hydrogeochemical modeling is used to discuss the action and law of uranium ore-forming under the hydrogeochemical conditions and its surrounding environment. The species of uranium are calculated by using geochemical model, as well as SI and RCI for ground water solutions. Applying these technologies, both the uranium migrated law and uranium precipitating mechanics are illustrated in this paper. Our study shows that the states of uranium solutions are involved with Eh values or pH values or the uranium concentrations of groundwater in those sandstone strata in this basin. Through this study, the uranium mineralization zone is predicted in this basin. This provides a powerful evidence for further exploration in this area. ©2010 IEEE.
Liu Y.,Key Laboratory of Nuclear Resources and Environment ECIT |
Liu Y.,East China Institute of Technology |
Cao X.,East China Institute of Technology |
Le Z.,Key Laboratory of Nuclear Resources and Environment ECIT |
And 5 more authors.
Journal of the Brazilian Chemical Society | Year: 2010
The uranyl-ion-imprinted and non-imprinted cross-linked chitosan resins possessing quinoline- 8-ol moiety have been prepared. In all the cases, a significant imprinting effect was noticed on comparing percent extraction of uranium (VI). The resulting ion-imprinted resin was used for solid phase extractive preconcentration of uranium (VI) prior to its determination by spectrophotometry. Experimental variables that influence the quantitative extraction of uranium (VI) were optimized by both static and column methods. The retention capacity found for uranium (VI) was 218 mg g-1 of resin which is higher than the corresponding non-imprinted resins and other solid phase extraction sorbents possessing quinoline-8-ol moiety. The optimum pH range was 4.5-7.0. Uranium adsorbed was easily and quantitatively eluted with 1 mol L-1 HCl (10 mL) at a flow rate of 2 mL min-1. Interference studies showed a high tolerance of diverse ions and electrolyte species. The limit of detection was 2 μg L-1 and the dynamic linear range was 5-100 μg L-1. The accuracy of the developed method was tested with one uranium ore standard reference material. Furthermore, the proposed method was successfully applied for the determination of uranium in contaminated soil and sediment samples. ©2010 Sociedade Brasileira de Química.