Hydrothermal zircon geochronology: Age constraint on Nanling Range tungsten mineralization (Southeast China) |
| |
| Institution: | 1. School of Earth Sciences and Engineering, Nanjing University, 210046 Nanjing, PR China;2. Department of Geoscience, University of Nevada, Las Vegas, Las Vegas, NV 89154-4010, USA;1. Institute of Geology of the Academy of Sciences of the Czech Republic, v. v. i., Rozvojová 269, CZ-165 00 Praha 6, Czech Republic;2. Research Group on Granite Petrology, Instituto de Geociências, Universidade Federal do Pará, Caixa Postal 8608, 66075-100 Belém, Pará, Brazil;3. Vale Institute of Technology, Rua Boaventura da Silva, 955, 66055-090 Belém, Pará, Brazil;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. State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;3. State Key Laboratory of Biogeology and Environment Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;4. Department of Geology, University of Cincinnati, Cincinnati, OH 42221-0013, USA;5. Institut Supérieur des Mines et Géologie de Boké, Conakry 84 Boke, Guinea;1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Xianlin University Town, 210023 Nanjing, China;2. Geological Institute of Yunnan Nonferrous Geological Bureau, 650216 Kunming, China;3. Nanjing Institute of Geology and Mineral Resources, CGS, 210016 Nanjing, China;4. Geological Survey of Canada, Ottawa, ON K1A 0E8, Canada;5. National Research Center of Geoanalysis, 26 Baiwanzhuang, 10037 Beijing, China;6. Southern Hunan Institute of Geology and Survey, 423000 Chenzhou, China;1. DSI-NRF CIMERA, Department of Geology, University of Johannesburg, Johannesburg, South Africa;2. School of Earth Sciences, University College Dublin, Dublin, Ireland;3. School of Geosciences, University of the Witwatersrand, Private Bag 3, 2050 Johannesburg, South Africa;4. Department of Earth Sciences, University of Oxford, South Parks Road, OX1 3AN Oxford, United Kingdom |
| |
| Abstract: | The Nanling Range (Southeast China) is well known for its wolframite-bearing-quartz-vein (WQV) tungsten deposit. This study focuses on the geochemistry and geochronology of zircons from the WQV and challenges the current view of the tungsten mineralization in the Nanling Range. The features of the WQV zircons include: (1) pale brown, murky brown, or orange-red color and translucence under microscope; (2) {110} + {101} type crystal form; (3) weak cathodoluminescence; (4) enrichment of Hf (ranging from 1.97 to 7.83 wt.% HfO2), U (ranging from 0.02 to 3.97 wt.% UO2), Th (ranging from 0 to 0.65 wt.% ThO2), and P (ranging from 0 to 1.82 wt.% P2O5); and (5) presence of solid (hydrothermal and ore minerals) and fluid inclusions. These features indicate that the WQV zircons crystallized from hydrothermal fluids during tungsten mineralization. The in-situ LA-ICPMS U–Pb results of the WQV zircons from five different tungsten deposits in the Nanling Range yield similar ages, ranging from 134.4 ± 1.9 Ma to 132.9 ± 1.5 Ma, approximately 20 million years younger than proposed tungsten ore ages (155 ± 5 Ma). Several mineralization characteristics and field observations also cast doubt on the current model — Nanling Range tungsten ore is the result of orthomagmatic processes. The zircon characterization method provided in this study could be applied to tungsten metallogenic research in other parts of the world. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
