| 武夷山中段建宁地区淡色花岗岩形成时代、地球化学特征及地质意义 |
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| 关键词:Wuyishan Early Silurian to Early Devonian leucogranite crustal thickening extensional thinning MC-LA-ICPMS zircon U-Pb dating |
| 基金项目:国家自然科学基金项目(编号: 42102274)；自然资源部古地磁与古构造重建重点实验室开放课题(编号: KLPTR-09) |
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| Geochronological and Geochemical Constraints of Leucogranites in Jianning Area, Central Wuyishan, and Their Geological Implications |
| Our study shows the combined petrological, geochemical, and geochronological analysis of the Jianning leucogranites in Central Wuyishan. MC-LA-ICPMS zircon U-Pb dating data show the formation of Jianning leucogranites at ~440 Ma with a late-stage anatectic event occurring at 410–405 Ma. These leucogranites are strongly peraluminous and contain inherited zircons with ages clustering at 800–700 Ma, suggesting that the Neoproterozoic meta-sedimentary rocks of the Mayuan Group are their source rocks. They exhibit high SiO2 and K2O, low MgO, FeOt, CaO, and Na2O, enrichment in LREE and LILEs, depletion in HREE and HFSEs, and high Rb/Sr ratios, suggesting their generation by biotite fluid-fluxed or dehydration melting reactions. Integrating our results and other Early Paleozoic orogenic sedimentary, metamorphic, and magmatic records of South China, we inferred that the Jianning leucogranites were formed during the syn-orogenic crustal thickening phase, and the 410~405 Ma anatectic event may be related to the post-orogenic crustal thinning. |
| LU Yunke,XIN Yujia,LI Jianhua,WANG Jinming.2024.Geochronological and Geochemical Constraints of Leucogranites in Jianning Area, Central Wuyishan, and Their Geological Implications[J].Acta Geoscientica Sinica,45(6):926-940. |
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