| 浙西南八都群古元古代和三叠纪变质和岩浆事件的年代学证据 |
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| 关键词:Cathaysia Block Paleoproterozoic Badu Group metamorphic event zircon U-Pb LA-ICP-MS |
| 基金项目:中国地质科学院基本科研业务费项目(编号: JYYWF20182101);国家自然科学基金项目(编号: 41822205);中国地质调查局项目(编号: DD20160269) |
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| Geochronological Constraints on Paleoproterozoic and Triassic Metamorphism and Magmatism in the Badu Group, Southwest Zhejiang Province |
| The authors conducted a combined study of gneisses and intrusive granites of the Badu Group in southwestern Zhejiang Province of Cathaysia Block by such means as petrology, geochemistry, LA-ICP-MS zircon U-Pb geochronology and Lu-Hf isotopic analysis. The results show that the detrital zircons in the gneiss of the Badu Group have generally developed (metamorphic) accretion rim of 1882 Ma, while the crystallization ages of the granites that intruded into the Badu Group are concentrated in the range of 1861~1841 Ma. Based on the petrologic and isotopic chronological data obtained by the authors and previous researchers, it can be concluded that a strong orogenic event occurred in the Cathaysia Block in the late Paleoproterozoic (1890~ 1850 Ma). The orogeny was probably related to the convergence of the Columbia supercontinent. The Cathaysia Block may be one of the Columbia supercontinents. In addition, the authors also obtained a Triassic metamorphic zircon age of (235±1) Ma from the Badu Complex. Combined with data available, the authors infer that the Paleoproterozoic basement rocks underwent intensive reworking, associated with the Indosinian orogeny in South China. However, the process of Triassic deformation, metamorphism and exhumation of the Paleoproterozoic basement rocks and its role in shaping the Indosinian structural framework of South China remain undetermined and require further research. |
| YU Ying-qi,XIN Yu-jia,LI Jian-hua,SUN Han-shen,WANG Wen-bao.2020.Geochronological Constraints on Paleoproterozoic and Triassic Metamorphism and Magmatism in the Badu Group, Southwest Zhejiang Province[J].Acta Geoscientica Sinica,41(1):1-22. |
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