The “coal–bauxite–iron” structure in the ore-bearing rock series as a prospecting indicator for southeastern Guizhou bauxite mines |
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| Institution: | 1. State Key Laboratory of Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 46 Guanshui Road, Guiyang 550002, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. Geological Survey of Montenegro, Naselje Kruševac bb, Podgorica 81000, Montenegro;2. University of Belgrade, Faculty of Mining and Geology, Đušina 7, Belgrade 11000, Serbia;3. University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12-16, Belgrade 11000, Serbia;1. Center for Electron Nanoscopy, Technical University of Denmark, 2800 Kongens Lyngby, Denmark;2. Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Zografou Campus, 15784 Athens, Greece;3. Department of Geology & Mineral Engineering, Norwegian University of Science & Technology, 7491 Trondheim, Norway;4. Department of Physics, University of Ioannina, 45110 Ioannina, Greece;5. ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;6. Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry, Kaiserstrasse 12, 76131 Karlsruhe, Germany;7. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, 3001 Leuven, Belgium;8. Department of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences-Wuhan, Wuhan 430074, China;2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences-Wuhan, Wuhan 430074, China;3. Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, USA;4. General Academy of Geological Survey of Guangxi, Nanning 530023, China |
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| Abstract: | Bauxite deposits in southeastern Guizhou occur in the lower Permian Liangshan Formation. The rock series bearing the sedimentary bauxite exhibit a typical “coal–bauxite–iron” structure, in which the lower part consists of bauxitic shale intercalated with siderite concretions, the middle part consists of bauxitic rock intercalated with multilayer lenticular or earthy bauxite, and the upper part consists of carbonaceous shales and sandstones intercalated with coal seams. The paralic, coastal and paludal depositional environments at one time had a stable tectonic setting. By studying the elemental geochemistry of the ore-bearing rock series, it can be seen that the common presence of the “coal–bauxite–iron” structure has resulted from (1) the extensive desilication and iron depletion during the formation of the sedimentary bauxite due to the varying physical and chemical environment, and (2) the sufficient supply of organic matter by the external environment. Such geological anomalies that resulted from the physical and chemical changes during the formation of the layered structure in the ore-bearing rock series can serve as a mineralization indicator in prospecting for new deposits. |
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