| SHRIMP U-Pb zircon geochronology of Yangfang aegiriteaugite syenite in Wuyi Mountains of South China and its tectonic implications |
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| 作者姓名： | WANG Qiang ZHAO Zhenhua JIAN Ping BAO Zhiwei XIONG Xiaolin & MA Jinlong . Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China . Geological Institute Chinese Academy of Geological Sciences Beijing China Correspondence should be addressed to Wang Qiang |
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| 作者单位： | WANG Qiang,ZHAO Zhenhua,BAO Zhiwei,XIONG Xiaolin,MA Jinlong(Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China);JIAN Ping(Geological Institute, Chinese Academy of Geological Sciences, Beijing 100037, China) |
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| 基金项目： | 中国科学院知识创新工程项目，国家自然科学基金，中国科学院知识创新工程项目，国家攀登计划，国家重点基础研究发展计划(973计划) |
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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 206Pb/238U ages in a narrow range of 233—249 Ma, which correspond to a single age population with a weighted mean 206Pb/238U age of 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 local area, South China. This discovery provides a new insight for farther understanding of 揑ndosinian orogeny in South China.
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| 关 键 词： | 中国南部 武夷山 霓辉石 正长岩 锆石U-Pb测年 地球年代学 地质构造 |
SHRIMP U-Pb zircon geochronology of Yangfang aegiriteaugite syenite in Wuyi Mountains of South China and its tectonic implications |
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| WANG Qiang,ZHAO Zhenhua,JIAN Ping,BAO Zhiwei,XIONG Xiaolin & MA Jinlong . Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou ,China, . Geological Institute,Chinese Academy of Geological Sciences,Beijing ,China Correspondence should be addressed to Wang Qiang.SHRIMP U-Pb zircon geochronology of Yangfang aegiriteaugite syenite in Wuyi Mountains of South China and its tectonic implications[J].Chinese Science Bulletin,2003,48(20):2241-2247. |
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| Authors: | Wang Qiang Zhao Zhenhua Jian Ping Bao Zhiwei Xiong Xiaolin Ma Jinlong |
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| Institution: | e-mail: wqiang @gig.ac.cn |
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| Abstract: | 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 206Pb/238U ages in a narrow range of 233-249 Ma, which correspond to a single age population with a weighted mean 206Pb/238U age of 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 local area, South China. This discovery provides a new insight for farther understanding of "Indosinian orogeny" in South China. |
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| Keywords: | SHRIMP zircon U-Pb age Indosinian epoch alkaline magmatic rocks extension South China |
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