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Lu Y.,Chinese Academy of Geological Sciences | Lu Y.,Key Laboratory of Saline Lake Resources and Environment | Zhao P.,CAS Institute of Geology and Geophysics | Xu R.,CAS Institute of Geology and Geophysics | Xie L.,CAS Institute of Geology and Geophysics
Scientia Geologica Sinica | Year: 2012

Based on previous geothermal tracing researches by boron isotopes, and by utilizing the state-of-art MC-ICP-MS analytical technique for measuring boron isotope ratios, the mixing processes between deep geothermal water and surface cold water of the Yangbajing (YBJ) geothermal field in Tibet were determined. The 8 B values of geothermal water range from -10.5%c to -9.1‰, indicating the non-marine sources. And further we propose that B is derived from host altered granite according to regional geological features, and the host altered granite should have similar boron isotope ratios to the deep geothermal water. Shallow geothermal water samples suggest that there is fractionation of B isotopes in the YBJ shallow reservoir. Accordingly, some complicated factors will be introduced into the two end-member mixing model in the YBJ since there is only little difference of boron isotopes between two end-members. Therefore, we discussed in details that exploitation, water-rock interaction, separation between vapor and liquid phase and scaling are some possible factors for yielding B isotopic fractionation. Source


Zheng M.,Chinese Academy of Geological Sciences | Zheng M.,Key Laboratory of Saline Lake Resources and Environment
Environmental Earth Sciences | Year: 2011

The Chinese salt lake mega-region is controlled by an arid and semi-arid climate, and modern salt lakes are mainly distributed within areas with mean annual precipitation <500 mm. According to their geomorphological features, structural conditions, and material composition, salt lakes in China can be broadly divided into four regions. The degrees of exploitation and utilization of these salt lakes differ because these four regions have experienced different climatic changes and structural activities and have had their own characteristics of salt lake evolution since the beginning of the Quaternary. The salt lakes in these regions have different scales, economic value, and technical conditions for traffic. Among others, Jarantai (Jartai) Salt Lake and Yuncheng Salt Lake are better in terms of comprehensive utilization and environmental protection, and the potash salt lakes represented by Qarhan are most important in terms of exploitation. At present, there exist many environmental problems in the salt lake regions of China, especially in remote, small and medium-sized basins, where abusive or wasteful mining, low recovery, and mining of a single saline mineral have caused impoverishment and large quantities of byproducts. Furthermore, climatic environmental factors can also cause significant changes of salt lake environment. Since 1987, against the background of global warming, the climate in the northwest salt lake region has turned warm and wet, and lakes have exhibited a tendency for expansion and rise, whereas in the east of the region, the climate has remained in a warm dry stage, lake levels have dropped, and salt lakes have become desertified. With the implementation of the strategy of building an environmentally friendly society in China, increasing attention is being paid to eco-environmental protection. It is suggested that experience and advanced techniques in terms of comprehensive utilization, overall development, and environmental protection of salt lakes at home and abroad be further developed to strengthen observation and monitoring of environmental changes of salt lakes and build an environmentally friendly, great salt lake industry. © 2010 Springer-Verlag. Source


Ma Z.-B.,CAS Institute of Geology and Geophysics | Ma Z.-B.,Key Laboratory of Saline Lake Resources and Environment | Cheng H.,Xian Jiaotong University | Cheng H.,University of Minnesota | And 8 more authors.
Quaternary Science Reviews | Year: 2012

A high-resolution and absolute-dated stalagmite record from Kulishu Cave, Beijing characterizes Asian Monsoon (AM) history in northern China between ca 14 and 10.5 ka BP (thousand yrs before present, present = 1950), including the entire Younger Dryas (YD) event. Using 230Th dates and counting of annual-layers, the shift into the YD began at 12,850 ± 40 yr BP and took ~340 yrs and the shift out of the YD began at 11,560 ± 40 yr BP and took <38 yrs (best estimate ~20 yrs), broadly similar to previously reported AM records from central and southeastern China. The more gradual nature of the start of the YD event as observed in the AM records appears to contrast with the more abrupt beginning observed in the Greenland ice records. The total amplitude of the AM YD event is also smaller than the amplitude of the AM Heinrich Stadial 1 event. In addition, the general rising trend of the AM during the Bølling-Allerød period contrasts with the general cooling trend in Greenland temperature during that time. The influence of rising insolation on the AM may explain this observation. © 2012 Elsevier Ltd. Source


Wu Q.,Chinese Academy of Geological Sciences | Wu Q.,Key Laboratory of Saline Lake Resources and Environment | Liu M.,Tsinghua University | Huang W.,HIGH-TECH | And 2 more authors.
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2012

Across Tibetan Plateau, there is bountiful solar energy and salt lake resource. However, the lack of the conventional energy for the mineral exploitation of the salt lake is a touchy issue. The solar energy utilization and the salt lake exploitation can be combined to bridge the gap between the energy demand and the economic development. Solar pond technique is a special way for the exploitation of the salt lake mineral resources by using the solar energy. In this paper, it was illustrated that Tibetan Plateau is an ideal place for the construction and operation of solar pond. Also, this paper described the significant superiority of solar pond crystallization compared with the natural evaporation crystallization in the mineral resource exploitation of the salt lake in Tibet. It was pointed out that the crystallization rate of the high added-value saline minerals, especially the lithium carbonate, can be speeded up in the solar pond, thereby increasing the production efficiency. In addition, the grade of lithium carbonate in the mixed salt can also be improved significantly, the salt product obtained from the solar pond can be used for the final fine processing directly. The research and development of the solar pond technology, which has very important significance in the utilization of the solar energy resource and the exploitation of the salt lake resource in Tibetan Plateau, should be paid more attention in the future. © 2012 IEEE. Source


Zhang Y.-S.,Chinese Academy of Geological Sciences | Zhang Y.-S.,Key Laboratory of Saline Lake Resources and Environment | Niu S.-W.,Tianjin Institute of Geology and Mineral Resources | Tian S.-G.,Chinese Academy of Geological Sciences | And 7 more authors.
Geological Bulletin of China | Year: 2012

Previous researches on the Upper Permian Linxi Formation in Linxi County and Taohaiyingzi Formation in Jalaid Banner show that the main fossils are freshwater bivalves and plant fossils. Except for Taohaiyingzi Formation, conchostracan fossils had never been discovered in this area. In this study, the conchostracan fossils were discovered firstly in the upper part of the Linxi Formation in Guandi section of eastern Linxi County, Inner Mongolia, which are preliminarily identified as Huanghestheria linxiensis Niu (sp. nov)., Cyclotunguzites cf. gazimuri Novojilov, and Sphaerorthothemos cf. cellulatus (Lutkevich) respectively. Therefore, the conchostracan fossils discovery in Linxi Formation provides the reliable fossil evidence for the determination of the age of Linxi Formation as well as for stratigraphic correlation and palaeogeographic reconstruction. This achievement has important stratigraphic and palaeogeographicy tectonic significance. Source

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