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Zhu C.W.,Chinese Academy of science | Zhu C.W.,University of Chinese Academy of Sciences | Wen H.J.,Chinese Academy of science | Zhang Y.X.,Chinese Academy of science | And 4 more authors.
Science China Earth Sciences | Year: 2013

Up to now, the evaporation and condensation, as well as the biological absorption and inorganic absorptions, have been proved to be major factors in Cd isotope fractionation. And Cd isotopes have been widely applied in studies on the universal evolution and marine environment and so on. However, only a few researches have been conducted in applying Cd isotopes to trace the source of metallogenic material and the evolution of the ore-forming fluid in a complex mineralization environment, especially in a hydrothermal ore-formation system. We measured the Cd isotopic compositions of sphalerite, galena, and ores from five lead-zinc deposits in SW China, and found that the δ 114/110Cd values varied from -1.53‰ to 0.34‰, with a total range of 1.87‰, which is greater than most of measured geological samples. Meanwhile, through contrasting the Cd content with Cd isotopic compositions of different deposits, it may be concluded that different genetic lead-zinc deposits have different Cd content and isotopic compositions, which could be a tool for the studies on the origin of ore deposits. Also, the biomineralization and crystal fractionation may also result in Cd isotope fractionation. In a word, although the research of Cd isotopes is presently at the preliminary stage (especially in hydrothermal ore-formation system), this study demonstrated that Cd isotopes can give a clue in tracing the evolution of ore-forming fluid and metallogenic environment. © 2013 Science China Press and Springer-Verlag Berlin Heidelberg. Source


Liu C.,Central South University | Jin Z.,Non ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou | Guo J.,Central South University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

The bauxite's distribution law and formation mechanism in Wuzhengdao area were studied based on observation of exploratory trench and well and sample test. The results show that the main facies of bauxite are formed in continental sedimentary environment, and the facies include alluvial fan, lake and tidal flat. The facies of chlorite are alluvial fan. Bauxite deposits in lake, which distributes on alluvial flat beady. Facies of carbonaceous shale deposition on top of bauxite are tidal flat and mud flat. Xixia formation is deposited in marine, so facies of bauxite to Xixia formation are continental facies to marine facies. Bauxite is deposited in incised channel that develops on Huanglong formation during the lowest tract, and Xixia formation is deposited during transgressive system tract. What's more, two base levels can be identified during bauxite deposition, which corresponds with bauxite and chlorite. Bauxite is deposited during stable stage of base level, which is the main time of sedimentary differentiation. ©, 2015, Central South University of Technology. All right reserved. Source


Liu C.-S.,Central South University | Jin Z.-G.,Non ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou | Yu W.,Central South University
Kuangwu Yanshi/ Journal of Mineralogy and Petrology | Year: 2014

Bauxite distribution regularity and formation mechanism are studied by facies analysis in Wuzhengdao area,in order to guide the exploration of bauxite. Based on observation of 358 m exploratory trench,22 wells,and 155 sample analysis,it is revealed that the main sedimentary facies of bauxite is continental deposition environment,including alluvial fan,lake and tidal flat,and the facies of chlorite in the bottom is alluvial fan. It shows that bauxite deposits in lake and distributes like shoestring on alluvial flat. The Qixia Formation on the top of ore-forming system is deposited in marine. Therefore, there is a transition of continental facies to marine facies from bauxite to Qixia Formation. In fact, bauxite is deposited in incised channel that developed on Huanglong Formation during lowstand system tract, and Qixia Formation is deposited during transgressive system tract. Two base levels can be identified during bauxite deposition,which corresponds to bauxite and chlorite. Bauxite is deposited during stable stage of base level,which is the main time of sedimentary differentiation. Source


Liu C.-S.,Central South University | Jin Z.-G.,Non ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou | Guo J.-H.,Central South University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

Bauxite distribution law and formation mechanism can be known by sequence stratigraphy analyses of bauxite in Wuzhengdao area, North Guizhou, which can guide exploration of bauxite ore. Based on observation of exploratory trench, cores well and results of sample test, it can be gotten that the main facies of bauxite are marine and continental sedimentary environment, including alluvial fan, lagoon, lake and marsh. Three sequence boundaries of type I can be identified, and three sequences can be divided. Chlorite rock and bauxite rock under every sequence deposit in transgressive system tract and bauxite ore upper every sequence deposits in lake. The marine level rises from ore-bearing layer to bottom of Qixia formation (P2q) on the whole, and the facies change from marine and continental facies to marine facies correspondingly. The time is short during deposit of transgressive system tract, and alluvial fan and lagoon develop well. The rock types of transgressive system tract include chlorite and bauxite rock. The time is long during deposit of highstand system tract, and the sedimentary differentiation of chlorite, bauxite rock and its weathered material is carried out fully, which result in forming bauxite ore. So the sequence framework can control the forming of bauxite ore. ©, 2015, Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals. All right reserved. Source

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