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首页> 外文期刊>Chinese science bulletin >SHRIMP U-Pb zircon geochronology of Yangfang aegiriteaugite syenite in Wuyi Mountains of South China and its tectonic implications
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SHRIMP U-Pb zircon geochronology of Yangfang aegiriteaugite syenite in Wuyi Mountains of South China and its tectonic implications

机译：南方武夷山阳芳金刚砂正长岩的SHRIMP U-Pb锆石年代学及其构造意义

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摘要

In addition to the wide spread peraluminous granites, some alkaline or alkali-rich intrusive rocks were recently observed in the Wuyi Mountains. The Yangfang aegiriteaugite syenites in the Wuyi Mountains are strongly enriched in light rare earth elements (LREE), K, Ba, Ga, Zr and Y. What is more, differentiations of REE are obvious. In addition, the Yangfang aegiriteaugite syenites have also some characteristics similar to A-type granite. Zircons are selected from the Yangfang aegiriteaugite syenites for Sensitive High-Resolution Ion Microprobe (SHRIMP-II) U-Pb geochronology study. 15 analyses give concordant ~(206)Pb/~(238)U ages in a narrow range of 233-249 Ma, which correspond to a single age population with a weighted mean ~(206)Pb/~(238)U ageof 242 +- 4 Ma, which records the crystallization time of the aegiriteaugite syenites. It is suggested that: (1) there were early Triassic peralkaline intrusive rocks in South China; (2) the early Indosinian extension event was probably active in localarea, South China. This discovery provides a new insight for farther understanding of "Indosinian orogeny" in South China.
机译：除了分布广泛的高铝花岗岩外，最近在武夷山还观察到一些碱性或富碱侵入岩。武夷山阳坊绿陶质正长岩中富含轻稀土元素（LREE），K，Ba，Ga，Zr和Y。此外，REE的分化也很明显。另外，阳芳绿铁矾正长岩也具有与A型花岗岩相似的特征。锆石选自阳芳铁绿辉石正长岩，用于敏感的高分辨率离子微探针（SHRIMP-II）U-Pb年代学研究。 15个分析给出了〜（206）Pb /〜（238）U的一致年龄，范围在233-249 Ma的狭窄范围内，对应于加权平均〜（206）Pb /〜（238）U的单一年龄群体的242岁+-4 Ma，它记录了aegiriteaugite堇青石的结晶时间。建议：（1）华南地区存在早三叠世的碱性碱性侵入岩； （2）早期的印支期扩张事件可能在华南地区活跃。这一发现为进一步了解中国南方的“印支期造山运动”提供了新的见解。

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