Structural control on the shape of intrusions in the Koktokay ore district,Chinese Altai,north western China |
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| Institution: | 1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19, Beitucheng Western Road, Chaoyang District, 100029, Beijing, PR China;2. Beijing Institute of Geology for Mineral Resources, 100012, Beijing, PR China;3. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, PR China;1. State Key Laboratory of Geological Processes and Mineral Resources and Institute of Earth Sciences, China University of Geosciences, Beijing 100083, PR China;2. CSIRO Earth Science and Resource Engineering, PO Box 1130, Bentley, WA 6102, Australia;3. School of Earth and Environment, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;4. Department of Applied Geology, Curtin University, Bentley, WA 6845, Australia;5. Department of Geosciences, National Taiwan University, Taipei 106, Taiwan;6. Geological Survey of Norway-NGU, 7491 Trondheim, Norway;7. Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology-NTNU, 7491 Trondheim, Norway;1. Aix-Marseille Université, CNRS, IRD, CEREGE UM34, 13545 Aix en Provence, France;2. IRSN, Avenue du Général Leclerc, BP 17, 92262 Fontenay-aux-Roses, France;3. TOTAL, CSTJF, Avenue Larribau, 64018 Pau, France;1. CET, University of Western Australia, Crawley, Australia;2. CSIRO Mineral Resources, Kensington, Australia;3. Firefinch Ltd, Subiaco, Australia;1. Departamento de Ingeniería Estructural y Geotécnica, Pontificia Universidad Católica de Chile, Santiago, Chile;2. Andean Geothermal Centre of Excellence (CEGA, FONDAP-CONICYT), Santiago, Chile;3. Department of Earth Sciences, University College London, London, United Kingdom;4. Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Bochum, Germany;5. Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom |
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| Abstract: | The Koktokay pegmatite-type rare-metal-bearing ore district in the Altai orogen is famous for both its large scale and its diversity of rare metals. However, the emplacement mechanisms of the ore-bearing pegmatite intrusions in the Koktokay ore district are still unclear. Based on field observations, the emplacement of the ore-bearing pegmatite intrusions falls into two types. The first type is typical of the formation of dykes and sills, whereby they intruded into fan shaped, moderate dipping, joints within plutonic rocks. The second type involves the formation of a punched laccolith that was fed by a pegmatite sill. Magmatic stoping is the main mechanism of the laccolith emplacement. The peripheral faults played an important role in helping the emplacement of the laccolith. The trend of dykes and sills indicate two potential prospecting areas, which are located in the western and northern regions of the Koktokay ore district. |
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| Keywords: | Joints Faults Pegmatite Dykes Sills Punched laccolith |
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