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作者（2019）在《Metallogenic controls on the granite-related W–Sn deposits in the Hunan–Jiangxi region, China: evidence from zircon trace element geochemistry》一文中研究指出：The Nanling Range in South China is well known for its rich granite-related W–Sn deposits.To elucidate the controls of different granite-related W–Sn metallogenesis in the region,we chose five representative orerelated granites（Yanbei,Mikengshan,Tieshanlong,Qianlishan,and Yaogangxian intrusions）in the Hunan–Jiangxi region,and studied their magmatic zircon ages and trace element geochemistry.Our new zircon data showed the differences in ages,temperatures and oxygen fugacity of the ore-forming magmas.Zircon U–Pb ages of the Yanbei andMikengshanintrusionsarecharacterizedby142.4±2.4 and 143.0±2.3 Ma,respectively,whereas the Tieshanlong and Qianlishan intrusions are 159.5±2.3and 153.2±3.3 Ma,respectively.The Sn-related intrusions were younger than the W-related intrusions.The Tiin-zircon thermometry showed that there was no systematic difference between the Sn-related Yanbei（680–744°C）and Mikengshan（697–763°C）intrusions and the W-related Tieshanlong（730–800°C）,Qianlishan（690–755°C）and Yaogangxian（686–751°C）intrusions.However,the zircon Ce4+/Ce3+ratios of the Yanbei（averaged at 18.3）and Mikengshan（averaged at 18.8）intrusions are lower than those of the Tieshanlong（averaged at 36.9）,Qianlishan（averaged at 38.4）and Yaogangxian（averaged at 37）intrusions,indicating that the Sn-related granitic magmas might have lower oxygen fugacities than those of the W-related.This can be explained by that,in more reduced magmas,Sn is more soluble than W and thus is more enriched in the residual melt to form Sn mineralization.The difference in source materials between the Sn-related and the W-related granites seems to have contributed to the different redox conditions of the melts.
Abstract
The Nanling Range in South China is well known for its rich granite-related W–Sn deposits.To elucidate the controls of different granite-related W–Sn metallogenesis in the region,we chose five representative orerelated granites（Yanbei,Mikengshan,Tieshanlong,Qianlishan,and Yaogangxian intrusions）in the Hunan–Jiangxi region,and studied their magmatic zircon ages and trace element geochemistry.Our new zircon data showed the differences in ages,temperatures and oxygen fugacity of the ore-forming magmas.Zircon U–Pb ages of the Yanbei andMikengshanintrusionsarecharacterizedby142.4±2.4 and 143.0±2.3 Ma,respectively,whereas the Tieshanlong and Qianlishan intrusions are 159.5±2.3and 153.2±3.3 Ma,respectively.The Sn-related intrusions were younger than the W-related intrusions.The Tiin-zircon thermometry showed that there was no systematic difference between the Sn-related Yanbei（680–744°C）and Mikengshan（697–763°C）intrusions and the W-related Tieshanlong（730–800°C）,Qianlishan（690–755°C）and Yaogangxian（686–751°C）intrusions.However,the zircon Ce4+/Ce3+ratios of the Yanbei（averaged at 18.3）and Mikengshan（averaged at 18.8）intrusions are lower than those of the Tieshanlong（averaged at 36.9）,Qianlishan（averaged at 38.4）and Yaogangxian（averaged at 37）intrusions,indicating that the Sn-related granitic magmas might have lower oxygen fugacities than those of the W-related.This can be explained by that,in more reduced magmas,Sn is more soluble than W and thus is more enriched in the residual melt to form Sn mineralization.The difference in source materials between the Sn-related and the W-related granites seems to have contributed to the different redox conditions of the melts.
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