Structural analysis of the Baolun gold deposit,Hainan Island,South China: Implications for metallogeny |
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| Affiliation: | 1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;2. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;4. Hainan Bureau of Geology, Haikou 570206, China;1. Int’l GeoSol Consulting Inc., 189 – Scripps Landing N.W. Calgary, AB T3L 1W1, Canada;2. Russian Central Geological Prospecting Institute (TsNIGRI), 129-B – Warshawskoe Chaussee, Moscow 113545, Russia;1. State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. State Key Laboratory of Geological Processes and Mineral Resources, and Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;3. Beijing Research Institute of Uranium Geology, Beijing 100029, China;4. Wuhan Center, China Geological Survey, Wuhan 430205, China;5. No. 2 Geological Party, Bureau of Geology and Mineral Exploration and Development, Lhasa 850007, Tibet, China;1. Beijing Research Institute of Uranium Geology, Beijing 100029, China;2. Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China;3. Zijin Mining Group Co. Ltd, Shanghang 364200, Fujian, China;1. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Universidad Politécnica de Madrid, Center for Computational Simulation, Department of Geological and Mining Engineering, Ríos Rosas, 21, 28003 Madrid Spain;2. University of Granada, Department of Mineralogy and Petrology, Av. Fuentenueva s/n, 18002 Granada Spain;3. Universidad Politécnica de Madrid, Department of Geological and Mining Engineering, Ríos Rosas, 21, 28003 Madrid Spain;1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;2. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;3. Department of Geology, University of Regina, Regina S4S 0A2, Canada;4. Team 402, Hunan Geology and Mineral Resources Exploration and Development Bureau, Changsha 410014, China |
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| Abstract: | The Baolun gold deposit is a mesothermal orogenic gold deposit located in the southwestern part of Hainan Island, South China. The deposit comprises a series of NNW-trending quartz-sulfide lodes situated within a parallel array of fault zones traversing a sequence of variably foliated flysch siliciclastic rocks of the Lower Silurian. Detailed field mapping documented at least five phases of deformation in the deposit including NNW-trending folding of the Lower Silurian rocks (D1), development of NNW-trending, steeply dipping ductile shear zones with an oblique dextral sense corresponding to NNE-SSW shortening (D2), WNW-ESE shortening and extension associated with an early oblique sinistral ductile shearing along the NNW-trending fault zones (D3), ENE-WSW shortening (D4), and near N-S extension (D5). The gold-bearing quartz lodes cut the strata folded in the D1, show some laminar layering related to ductile shear in the D2 and are overprinted by brittle structures formed in the D3 to D5. 40Ar–39Ar dating on muscovite from an auriferous quartz lode yielded an age of 242 ± 2.5 Ma, which, together with the age of 232 ± 2.5 Ma for an aplite vein in the deposit, suggests that the mineralization may be related to a tectono-thermal event in the Triassic. In the context of the southern South China plate tectonics, the formation of the Baolun gold deposit is interpreted to be related to the oblique dextral ductile shearing (D2) along the NNW-trending fault zones during the Indosinian orogeny, in relation to the convergence between the Indochina and South China plates. |
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| Keywords: | Baolun gold deposit Lower Silurian Hainan Island South China Indosinian orogeny |
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