Genesis of the Jinding Zn-Pb deposit,northwest Yunnan Province,China: Constraints from rare earth elements and noble gas isotopes |
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| Institution: | 1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;2. Department of Geological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;3. Scottish Universities Environmental Research Center, East Kilbride G75 0QF, UK;1. Montanuniversität Leoben, Chair of Resource Mineralogy, Peter Tunner-Straße 5, 8700 Leoben, Austria;2. Scottish Universities Research Centre (SUERC), East Kilbride, Glasgow G75 0QF, Scotland, UK;1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN 47405, USA;4. National Research Center for Geoanalysis, Beijing 100037, China;1. College of Earth Sciences and Recourses, Chang’an University, Xi’an 710054, China;2. Department of Geological Sciences, Indiana University, Bloomington, IN 47405, USA;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN 47405, USA;1. MlR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education, School of Geosciences and Infophysics, Central South University, Changsha 410083, China;3. China University of Geosciences (Beijing), Beijing 100083, China;4. Hunan Institute of Geological Survey, Changsha 410116, China |
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| Abstract: | The giant sediment-hosted Jinding zinc-lead deposit is located in the Lanping Basin, northwestern Yunnan Province, China. The genesis of the deposit has long been debated and the sources of the ore-forming fluids and metals are controversial. This study presents rare earth element (REE) and noble gas isotope data that constrain the origins of the ore fluids and the heat source driving the hydrothermal circulation. The early-stage sulfides are enriched in light REEs and have high ∑REE values (30.8–94.8 ppm) and weakly negative Eu (δEu 0.85–0.89) and Ce anomalies (δCe 0.84–0.95), suggesting that the fluids were likely derived from dissolution of Upper Triassic marine carbonates with input of REEs from aluminosilicate rocks in the basin. In contrast, the late-stage sulfides have irregular REE patterns, generally low ∑REE values (0.24–10.8 ppm) and positive Eu (δEu 1.22–10.9) and weakly negative Ce anomalies (δCe 0.53–0.90), which suggest that the ore-forming fluids interacted with evaporite minerals. The 3He/4He (0.01–0.04 Ra) and 40Ar/36Ar values (301–340) of the ore-forming fluids indicate crustal and atmospheric origins for these noble gases. These findings are in agreement with the published fluid inclusion microthermometry data and the results of H, O, C, S, Pb and Sr isotope studies. Our data, in combination with published results, support a two-stage hydrothermal mineralization model, involving early-stage basinal brines and late-stage meteoric water that acquired metals and heat from crustal sources. |
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| Keywords: | Origin Noble gas isotopes Rare earth elements Jinding Sanjiang Metallogenic Domain (SMD) |
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